Nim cligen Localization, dispatch and Help QA

Nim cligen localization means translating the help messages and usage instructions of a Nim command-line tool whose interface can be generated directly from procedure signatures. If you need multilingual cligen dispatch documentation, translated help tables, dispatchMulti subcommand guidance, custom argument converter explanations, Unicode options or a reliable Nim CLI release checklist, the key is understanding which strings are generated and which parts of a procedure become executable command syntax.

Unlike a CLI built from a large separate argument-specification file, cligen can infer names, types, requiredness and defaults from Nim procedures, then generate option parsing and help around them. Its documented dispatch macro, help and short settings, dispatchMulti facility and conversion hooks make concise interfaces possible. They also create a translation trap: the name that a writer wants to localize may originate in a real parameter name, not a display-only label.

This global guide uses a fictional, read-only inspection command to explain safe translation boundaries, language choices, command syntax, help rendering and packaged testing. It is for Nim programmers, translators, open-source maintainers and anyone distributing command-line tools across languages. We focus on what a reader must be able to do, and we avoid assuming that changing a help sentence also changes parsing rules or that macro-generated messages come with a full internationalization system.

Quick answer: localize help tables without silently changing inferred argument names

Keep public option spellings and accepted values stable. Supply reviewed descriptions through cligen’s documented help customization, examine auto-generated usage, and test the resulting command rather than judging a source string alone. Because cligen uses Nim macros and inferred procedure information, decide whether your product will embed a specific language at build time, provide separately documented language-specific builds, or implement an application-owned runtime presentation policy. Do not promise runtime locale switching until you have demonstrated it on the version you ship.

Read the procedure signature: requiredness, names, types and defaults are the foundation of generated help.
Use dispatch and parameter-keyed help descriptions to document actions accurately.
Treat short aliases and accepted long-option prefixes as parser behavior, not translation synonyms.
Check dispatchMulti at both the top level and the child-command level.
Review argParse, argHelp and custom types separately from natural-language copy.
Test Unicode, help-syntax output, configuration/environment integration and clean build artifacts.

The running example explains what cligen derives and why that matters for localization. The detailed field guide then addresses distinct implementation decisions, followed by practical investigations of mistakes that have real consequences. A four-week plan, frequently asked questions and official documentation links turn the explanation into a set of actions a development team can use.

A minimal generated Nim CLI

Consider atlas-check, a simple tool that accepts a required input path and an optional verbose flag. It prints which file would be inspected but does not open or alter that file. In cligen, a Nim procedure can be exported to the command line with a concise dispatch declaration. The descriptions shown here are English placeholders; a multilingual application should supply reviewed strings while preserving the interface contract.

import cligen

proc inspect(input: string, verbose = false): int =
  ## Report which input would be inspected; do not modify it.
  echo "Selected input: ", input
  if verbose:
    echo "Verbose mode requested"
  result = 0

when isMainModule:
  dispatch inspect,
    help = {
      "input": "Path of the input file to inspect",
      "verbose": "Show additional diagnostic information"
    }

Notice that input has no default, while verbose does. cligen uses signature information to infer command-line behavior, so changing the spelling or type of a procedure parameter can change more than documentation. The help mapping supplies readable descriptions for the named parameters; the keys are connected to those parameters, not freely translatable sentences.

Build the example with the Nim and cligen versions intended for distribution, then inspect the generated --help and the actual behavior of missing and supplied arguments. This step matters because a sample that looks plausible on a webpage is not proof of parser behavior. The correct test is to run the resulting executable and compare accepted values, output and exit state against the help the reader sees.

Why Nim macro generation changes the translation strategy

A macro can generate code and help from compile-time information. That makes interfaces compact but requires a clear account of when language resources are chosen. A conventional runtime dictionary is not automatically interchangeable with a compile-time expression expected by a macro. When choosing a locale strategy, verify what the pinned cligen version accepts and prefer the simplest reproducible approach. If messages are baked into the binary, a runtime setting cannot magically replace them without additional application design.

cligen also makes the relationship between API design and CLI design unusually visible. Rename a parameter in a procedure, and you must ask whether its public long option was affected. Change a type and its converter, and help that describes the old accepted value may become false. Add a subcommand with a similar prefix, and an abbreviation previously understood by the parser may become ambiguous. Translation is therefore part of interface maintenance, not a decorative last step.

Thirty-two cligen localization and compatibility decisions

1. Help table keys

The translator replaces the "input" key in a help mapping with a translated noun and the mapping no longer matches the intended parameter. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Keep the keys tied to Nim parameter identifiers; translate the associated human descriptions. Review generated help for missing or generic fallback entries before release. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Compile the tool and check that each option has the intended description rather than an unexplained ‘set’ placeholder. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

2. Procedure parameter names

A developer renames a parameter for readability in source code and inadvertently alters the public CLI’s inferred long option. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Treat source-level refactors as potential interface changes when cligen derives option names from them. Preserve old accepted syntax or undertake an explicit, versioned migration. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Replay old invocations after every signature change and compare parsed values. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

3. Required parameters

A translated sentence calls a required input optional even though its procedure parameter has no default. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Derive the requirement statement from the actual signature. Explain which value the user must provide and show a minimal valid invocation. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run the program without the parameter and with a real value; verify the contrast matches the help. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

4. Parameters with defaults

An Italian description says the default is zero, but the procedure now supplies a different value. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Document the current default as observed in the compiled binary. Avoid copying numeric assumptions from old screenshots into translated resources. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Omit the option and observe which value reaches the procedure, then compare the help claim. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

5. Parameter types

A converter expects an integer, while a translated example displays a fraction or a word describing the measurement. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Give translators the Nim parameter type and the documented accepted grammar. Explain semantic units without pretending that locale changes the converter. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Try values at the expected type boundary, malformed forms and the published example. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

6. Short aliases

The writer invents a translated first-letter short option that was never assigned with short. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Only publish aliases actually accepted by cligen. Where a short option is assigned or suppressed, document its status in all languages. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Execute each short and long spelling; do not infer equivalence from visual similarity. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

7. Auto-selected aliases

A new parameter changes which short alias is available, making screenshots and examples stale. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Audit generated aliases whenever the procedure signature changes. If scripts depend on an alias, make its assignment deliberate where supported. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Capture the old and new –help output and run saved short-option commands. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

8. Long-option prefixes

cligen can accept unambiguous prefixes for long names, but adding another option can change which prefixes are unique. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Avoid marketing a prefix as a permanent alias. Prefer full canonical names in documentation and scripts, particularly in localized examples. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Test the formerly accepted abbreviation after adding a conflicting option in a safe fixture. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

9. Style-insensitive identifiers

Users may type variant capitalization or dashes, but translators confuse that convenience with permission to invent arbitrary translated synonyms. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Document the actual normalization and matching rules of the installed package. Do not describe a natural-language translation as a recognized variant unless a test proves it. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Compare canonical, case-varied, kebab-case and unrelated translated spellings. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

10. Help sentences

A generic ‘set foo’ description tells the user nothing about side effects, accepted units or whether a path is read or written. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Provide parameter-specific help text with a concrete purpose and consequences. Use the user’s task as the center of the sentence rather than the implementation detail. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Ask someone unfamiliar with the source to predict the option’s effect from –help and test that prediction. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

11. Procedure doc comments

An English comment describes a read-only action, but the target-language summary says that files are edited. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Ensure the procedure summary and parameter help agree with actual behavior. Carefully translate verbs expressing inspection, validation, modification and deletion. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Observe a safe run and compare before-and-after input hashes to the claims made in help. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

12. Help-syntax output

A manual ignores advanced cligen usage forms while the generated --help-syntax describes them. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Review the exact syntax forms that the installed parser supports. Give readers concise basic examples first, linking to advanced syntax only when it aids a real task. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Invoke the documented syntax help and verify every copyable example. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

13. The end-of-options marker

A file name beginning with a dash is mistaken for a flag because the translated guide omits the -- delimiter. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Teach the end-of-options convention as syntax, not as punctuation to localize. Use a real example with a dash-leading filename. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run before and after the delimiter and record the difference. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

14. Short-option bundling

A translator rewrites a compact bundle as if it were a single word, obscuring the sequence of short flags. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

State which flags take values and how compact syntax works in the installed parser. Use separate long-option examples when bundling is not essential. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Execute a supported bundle and an invalid one; show readers the safer expanded form. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

15. Colon and equals separators

The parser supports a set of key-value separators, but the article replaces them with target-language punctuation. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Keep separators exact. Translate what the value means and explain which of the accepted forms readers can use, instead of translating the delimiter itself. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run –input=file and any other documented form against the compiled tool. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

16. Custom argument parsing

A new Nim type gains an argParse overload, yet its help still claims that it accepts a plain string. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Review accepted syntax and error pathways for each custom type. Give translators valid and invalid examples with constraints, units and default representations. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Exercise converter success, failure and boundary cases, then check the generated help. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

17. Custom argHelp

The display information supplied by argHelp no longer matches what the corresponding custom parser accepts. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Maintain converter and help output together, preferably with shared test fixtures. Do not treat a type’s display label as a promise of additional accepted formats. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Compare the actual conversion with the documented placeholder and sample value. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

18. Enum argument values

A local-language example translates an enum member as if it were an accepted command value. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Keep defined enum identifiers stable unless the converter deliberately supports aliases. Translate explanations and provide a table of valid literal values when they are not intuitive. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Try every documented enum value and one translated-but-unsupported synonym. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

19. Sequence arguments

The procedure accepts a sequence, but the translated usage implies that several values are packed into one literal phrase. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Explain repetition, delimiters and positional behavior precisely for the cligen version used. Separate copyable syntax from a natural description of the collection. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Test empty, one and several elements, including a value with spaces. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

20. Set and range values

A translated example displays a range in a different punctuation convention than the installed converter recognizes. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Preserve syntactic separators and boundaries. Explain mathematical meaning and units in language without assuming localized punctuation is accepted input. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Test both range endpoints, out-of-range values and the exact published example. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

21. Subcommands with dispatchMulti

A guide shows a localized child name, but dispatchMulti generated the command from a different procedure name. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Treat child command identifiers as executable syntax. Translate each child’s description and provide canonical invocations that reflect the actual generated interface. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run root help, the listed child name and a nonexistent translated child name. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

22. Subcommand-prefix ambiguity

Two similarly named procedures make a formerly accepted short child name ambiguous. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Prefer complete command names in tutorials. Test abbreviations only as convenience, and monitor them whenever adding or renaming commands. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Construct a fixture with overlapping child names and show that the canonical spellings still work. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

23. Root versus child help

A tester sees useful root help and assumes the individual child’s parameter help is equally clear. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Review top-level, child-specific and aggregate help separately. Each has a different reader task: discovery, usage or troubleshooting. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Capture all documented help entry points including help SUBCMD where supported. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

24. The generated main entry

A translated page describes calling a Nim library procedure directly, but a user actually invokes a compiled executable and its generated dispatcher. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Differentiate API use from the CLI entry point. Provide a concrete command invocation with actual parameter names and no imaginary runtime dependency on source syntax. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Build the binary and run examples outside the source directory. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

25. Build-time versus runtime messages

An editor assumes that changing a runtime environment variable replaces help text that was fixed during macro expansion. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Verify when the version’s help customization is evaluated. Use generated language-specific builds or a deliberate runtime strategy if necessary; do not promise seamless switching without implementation. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Compile, change the runtime locale, run –help again and document whether the visible text actually changes. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

26. Localization resource ownership

The application has its own translated status strings, but cligen’s generated labels remain English. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Inventory generated usage text, help table values, converter diagnostics and application output separately. A partial catalog is not a complete localization system. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run missing-value and malformed-type errors and identify each visible sentence’s owner. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

27. Error severity

An invalid argument triggers a fatal conversion error but the translation calls it a mere suggestion. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Preserve whether a value was rejected and how a user can recover. Keep diagnostics safe and avoid echoing sensitive input where it is unnecessary. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Feed malformed input and compare message severity with exit behavior. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

28. Configuration and environment merging

The product imports a helper that reads configuration or environment defaults, but documentation implies every visible value came from argv. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Explain which source supplies defaults and which wins when sources conflict. Do not modify precedence just to make a translated sentence easier to write. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Run with explicit argv, config-only and environment-only values, then a conflict. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

29. Unicode file names

A transliteration helper changes a path passed to the procedure, making a previously valid Unicode filename unavailable. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Keep file paths as data. Translate nearby prose, not the path bytes, and test filesystem behavior on supported platforms. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Use accented, CJK and combining-character paths in a non-destructive fixture. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

30. Terminal width and color

A translated help table with long words wraps badly, while decorative color makes important labels hard to read in a plain log. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Use documented rendering controls and readable short descriptions. Check both color and no-color behavior and do not depend on alignment alone for meaning. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Capture narrow and wide help, redirected output and a terminal that lacks color support. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

31. Right-to-left and mixed scripts

An Arabic explanation sits beside Latin flags and numbers, and visual direction makes option order unclear. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Put executable examples in isolated code formatting, keep punctuation unambiguous and review in real supported terminals with native readers. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Copy samples into a shell and compare the argv sequence received by the procedure. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

32. Packaging with Nimble

A compiled application works locally, but its translated resources or companion manual are absent in a distributed package. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Treat resource packaging, binary version and help verification as part of release QA. Test from clean installation paths and document whether catalogs are embedded or external. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Inspect the archive and run each supported language outside the repository. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

33. Interface changes during a refactor

A developer changes a Nim signature for performance and unintentionally alters CLI types, defaults or flag spelling. Because cligen derives so much from real Nim code, a small source edit can become a visible change in the command a reader runs. That is why the exact executable behavior matters as much as linguistic clarity.

Run command-interface fixtures after code refactors, not just after translation commits. Separate deliberate breaking changes from cosmetic rewriting in release notes. Identify whether the source of truth is a procedure parameter, a macro option, a converter, a help description or runtime application output before choosing the translation technique.

Compare saved argv results and printed help across old and new builds. Record compiler and cligen versions as well as locale and observed status. A second reviewer should be able to reproduce the result using the released binary rather than relying on screenshots alone.

Sixteen real-world troubleshooting investigations

Investigation 1: The generated help says ‘set input’

The help table lacks a matching entry for the required parameter. Verify the key uses the Nim parameter’s identifier and supply a clear purpose sentence. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Build and run –help, then compare the generated description with the intended resource. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 2: A new source name breaks an old script

A parameter was renamed in a refactor, and cligen inferred a different flag. Restore the old public interface or make a versioned migration with explicit compatibility tests. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Replay the previous documented command on the new binary. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 3: The French help suggests a non-existent short alias

A translator invented a convenient short flag using the French initial. Only document aliases configured and accepted by the dispatcher. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Invoke both the suggested and canonical flag to prove the difference. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 4: A prefix that worked yesterday now fails

A newly added option shares a prefix with an older one. Replace abbreviated examples with full names and audit any scripts depending on prefix matching. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Build the old and new versions and compare prefix ambiguity with canonical syntax. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 5: A custom type rejects the manual’s example

The argument converter was enhanced, but its argHelp documentation was not updated. Reconcile accepted grammar and the example. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Run valid and invalid conversion fixtures and update the text to match. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 6: An enum’s translated name fails to parse

The destination-language noun was presented as an accepted enum literal although the converter only recognizes defined identifiers. Explain the literal list accurately. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Test the published example and every accepted enum member. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 7: A dash-leading filename is treated as a flag

The guide failed to teach the end-of-options delimiter or the appropriate quoting convention. Restore a literal runnable example. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Pass a filename beginning with a dash before and after --. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 8: The root help obscures a child option

A dispatchMulti command has its own parameters, but the main help doesn’t make the navigation clear. Add child-specific help instructions. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Check tool help child and child –help as supported by the installed version. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 9: A runtime locale switch changes only result text

Macro-generated help was fixed earlier than the application-owned status strings. Document the limitation or implement a verified translation layer for help. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Change locale and compare –help with a normal status line. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 10: A packaged binary lacks a catalog

The development checkout includes resource files, but the release manifest omits them. Make artifact inspection a release gate. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Install in a clean directory, remove source-tree paths and run each supported locale. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 11: A generated diagnostic remains English

A translation covers explicit help strings, not all library-generated syntax and conversion errors. Inventory ownership rather than making a blanket localization claim. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Run unknown flag, missing required value and invalid-type tests and classify every line. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 12: A colored table becomes unreadable in logs

Redirected output loses useful color and alignment. Choose readable plain-text layouts and test non-TTY output explicitly. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Capture –help through a pipe and compare it with interactive display. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 13: An RTL command appears visually reversed

A code sample is embedded directly in Arabic prose. Put executable tokens in an isolated block and check bidi handling with a language reader. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Copy from the rendered page, execute and verify actual argv order. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 14: A localized decimal changes the parsed number

An example uses regional punctuation while the installed converter expects invariant syntax. Translate the unit description, not the parser contract. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Test both decimal conventions and verify exactly what the procedure receives. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 15: A failure message exposes a secret

An error handler echoes the raw value of a sensitive argument. Use safe placeholders or redaction and translate the explanatory pattern only. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Feed a synthetic secret and scan stdout, stderr and logs for disclosure. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Investigation 16: A translation claims a file was repaired

The utility is read-only, but a verb in the translated summary implies modification. Restore a verb matching the actual procedure’s behavior. A translation is reliable only if it keeps the reader’s expectation aligned with the generated parser and the operation the procedure actually performs.

Compare before-and-after file hashes during a safe test and check exit status. Save a concise transcript of the invocation, help text, locale and outcome for regression review. The smallest reproducible example is often more valuable than a lengthy account of what went wrong.

Four-week rollout plan for a Nim team

Week 1 — inventory generated CLI behavior

Build the existing utility and capture –help, –help-syntax, invalid options and successful invocations. Inventory procedure parameter names, default values, types, help keys, short mappings, converters and dispatchMulti child commands. Record how config or environment sources affect defaults if your application uses them. Classify text into generated library output, explicit descriptions and application messages. Preserve stable argv fixtures before altering any wording or signatures.

At the end of the week, retain evidence readable by two audiences: the Nim maintainer who verifies the generated interface, and the translator who verifies that an unfamiliar user can understand the action without guessing. Neither review should substitute for the other.

Week 2 — prepare accurate language explanations

Choose a realistic supported language list and a documented approach to build-time or runtime message selection. Add contextual, reviewed help descriptions for every meaningful parameter, plus separate application error and result resources. Explain exact input syntax, type conversion, units and requiredness to translators. Test whether the selected cligen version can support the intended runtime behavior; avoid claiming the feature merely because a language dictionary exists. Review naturalness and executable accuracy together.

Week 3 — investigate terminals, converters and commands

Test missing values, unknown options, custom argParse and argHelp behavior, unambiguous prefixes, style-insensitive names, subcommands, end-of-options markers and syntax help. Capture actual argv and outputs under different locales. Add Unicode filenames, long translated descriptions, narrow terminals, redirected output and right-to-left examples if supported. Keep output that machines consume structurally stable and ensure sensitive argument values are not leaked in translated errors.

Week 4 — ship clean artifacts with evidence

Build with pinned compiler and package versions, package language resources deliberately and test from a clean install. Re-run all published examples and the historical compatibility fixtures, including scripts using canonical options. State supported locales, fallback rules, accepted token spellings and any build-specific limitations. Record which generic library diagnostics remain untranslated if there is no verified solution. Revisit the documentation whenever a procedure signature, converter or child command changes.

Frequently asked questions

What is Nim cligen?

A library that can derive a command-line interface from Nim procedure signatures and generate parsing and help. Its concise dispatcher is useful, but it makes source parameter changes relevant to the public CLI contract. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

How do I translate a help entry?

Use the package’s documented parameter-keyed help customization, preserving the key that identifies the parameter while translating its explanatory value. Compile and inspect generated output, because a spelling mismatch may leave default help in place. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

Can I change option names for each language?

Not by translating the prose alone. Accepted names are executable syntax. Keep canonical names stable, and add alternatives only through a deliberate mechanism with compatibility tests. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What does dispatchMulti do?

It exposes multiple Nim procedures as command-style entries. Its root help and child help are distinct surfaces, so test and translate contextual explanations for each. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What if no default is given?

cligen’s documented behavior makes a parameter without a default required. Verify the actual compiled parser and ensure the help does not imply that such a value can be omitted. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

Are short flags automatically translated?

No. A short flag is a specific accepted token, not a letter that should be derived from an English or destination-language word. Test the aliases actually assigned. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What does argParse customize?

It supports conversion of command-line text to application types. Translating type descriptions cannot safely replace converter behavior; document accepted inputs and test failures separately. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What does argHelp customize?

It contributes display information for argument types. Keep that information accurate relative to the corresponding converter and its actual accepted grammar. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

Can I switch the generated help language at runtime?

Do not assume it. cligen relies on macro generation for important parts of the interface. Verify when descriptions are selected in your pinned version and design a runtime layer explicitly if your product requires it. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

Does cligen have advanced help syntax?

Its documentation describes syntax-help paths such as –help-syntax. Test the installed version and show exact invocations; do not invent synonyms in translated manuals. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What about Unicode and RTL languages?

Treat file names and option tokens as data. Test terminal rendering, width and mixed-direction command examples on real supported systems rather than relying only on source-text review. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

What is the final shipping standard?

Accepted commands, generated help, converter behavior, error semantics and packaged resources must match. Verify a clean binary with both successful and failing examples under every supported language policy. Keep a small tested example alongside the explanation, especially when the behavior is generated by a macro and may change between package versions.

Technical documentation

The official cligen project README describes dispatch, help, short, automatic option inference, subcommands and syntax rules. The cligen documentation index maps the relevant modules, while the main cligen API documentation covers dispatchMulti, converter hooks and help customization. The parseopt3 reference explains supported command-line forms. Consult the release installed in your build.

Related eduKateSG translation guides

Find neighboring articles through the Translate Like a Pro series index and Master Art of Translation complete system. For a contrasting CLI generator, see Python Fire generated-help localization. The focus here is Nim cligen’s signature-derived interface and the distinction between macro-generated syntax and translatable explanations.

Final release acceptance

Ask a reader to run the simplest successful command, look up a missing argument, copy a child-command example and recover from a custom conversion failure. Check that the exact flags shown in every language are executable, that a source refactor has not silently changed the command grammar, and that a clean released binary contains the intended message resources. Confirm that a language choice does not accidentally alter the meaning of numerical input, filesystem paths, status codes or machine-readable output. A trustworthy multilingual Nim CLI explains the interface users already have, and changes that interface only when the product deliberately says it will.

Translate Like a Pro | 7790 — Nim cligen Localization, dispatch, Help Tables, Unicode Options and CLI Release QA