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Write a coding standards document for a project using the coding styles from the file(s) and/or folder(s) passed as arguments in the prompt, without modifyin...
---
name: write-coding-standards-from-file
description: 'Write a coding standards document for a project using the coding styles from the file(s) and/or folder(s) passed as arguments in the prompt, without modifying analyzed source files unless edits are explicitly requested and confirmed.'
---
# Write Coding Standards From File
Use the existing syntax of the file(s) to establish the standards and style guides for the project. If more than one file or a folder is passed, analyze only the explicitly provided file paths or a narrowly scoped folder. Exclude secrets, private data, environment files, generated output, dependency folders, and unrelated directories by default. Aggregate style observations in temporary working memory instead of copying full source into persistent storage; if a temporary file is required for analysis, remove it immediately after the standards are generated.
## Rules and Configuration
Below is a set of quasi-configuration `boolean` and `string[]` variables. Conditions for handling `true`, or other values for each variable are under the level two heading `## Variable and Parameter Configuration Conditions`.
Parameters for the prompt have a text definition. There is one required parameter **`${fileName}`**, and several optional parameters **`${folderName}`**, **`${instructions}`**, and any **`[configVariableAsParameter]`**.
### Configuration Variables
* addStandardsTest = false;
* addToREADME = false;
* addToREADMEInsertions = ["atBegin", "middle", "beforeEnd", "bestFitUsingContext"];
- Default to **beforeEnd**.
* createNewFile = true;
* excludedPathGlobs = [".git/**", "node_modules/**", "dist/**", "build/**", "coverage/**", ".env*", "*.key", "*.pem", "*.pfx", "*.crt", "secrets/**", "private/**"];
- Exclude these by default when `${folderName}` is used unless the collaborator explicitly narrows the request to one of them.
* fetchStyleURL = true;
* findInconsistencies = true;
* fixInconsistencies = false;
* newFileName = ["CONTRIBUTING.md", "STYLE.md", "CODE_OF_CONDUCT.md", "CODING_STANDARDS.md", "DEVELOPING.md", "CONTRIBUTION_GUIDE.md", "GUIDELINES.md", "PROJECT_STANDARDS.md", "BEST_PRACTICES.md", "HACKING.md"];
- For each file in `${newFileName}`, if file does not exist, use that file name and `break`, else continue to next file name of `${newFileName}`.
* outputSpecToPrompt = false;
* persistTemporaryFiles = false;
- Temporary analysis files must be deleted after use unless the collaborator explicitly asks to keep them.
* requireEditConfirmation = true;
- Source file edits require explicit collaborator approval for the named files and a reviewed diff before acceptance.
* useTemplate = "verbose"; // or "v"
- Possible values are `[["v", "verbose"], ["m", "minimal"], ["b", "best fit"], ["custom"]]`.
- Selects one of the two example templates at the bottom of prompt file under the level two heading `## Coding Standards Templates`, or use another composition that is a better fit.
- If **custom**, then apply per request.
### Configuration Variables as Prompt Parameters
If any of the variable names are passed to prompt as-is, or as a similar but clearly related text value, then override the default variable value with the value passed to prompt.
### Prompt Parameters
* **fileName** = The name of the file that will be analyzed in terms of: indentation, variable naming, commenting, conditional procedures, functional procedures, and other syntax related data for the coding language of the file.
* folderName = The name of a narrowly scoped folder that will be used to extract data from multiple files into one aggregated dataset that will be analyzed in terms of: indentation, variable naming, commenting, conditional procedures, functional procedures, and other syntax related data for the coding language of the files.
* instructions = Additional instructions, rules, and procedures that will be provided for unique cases.
* [configVariableAsParameter] = If passed will override the default state of the configuration variable. Example:
- useTemplate = If passed will override the configuration `${useTemplate}` default. Values are `[["v", "verbose"], ["m", "minimal"], ["b", "best fit"]]`.
- fixInconsistencies = If passed as `true`, only edit explicitly approved target files after reviewing the diff.
#### Required and Optional Parameters
* **fileName** - required
* folderName - *optional*
* instructions - *optional*
* [configVariableAsParameter] - *optional*
## Variable and Parameter Configuration Conditions
### `${fileName}.length > 1 || ${folderName} != undefined`
* If true, toggle `${fixInconsistencies}` to false.
* Prefer read-only analysis across multiple inputs and summarize inconsistencies instead of rewriting source files.
### `${folderName} != undefined`
* Limit analysis to explicitly relevant files in the requested folder and exclude `${excludedPathGlobs}` by default.
* Do not scan secrets, generated output, dependency directories, caches, binaries, or unrelated/private folders unless the collaborator explicitly names them.
### `${addToREADME} == true`
* Insert the coding standards into the `README.md` instead of outputting to the prompt or creating a new file.
* If true, toggle both `${createNewFile}` and `${outputSpecToPrompt}` to false.
### `${addToREADMEInsertions} == "atBegin"`
* If `${addToREADME}` is true, then insert the coding standards data at the **beginning** of the `README.md` file after the title.
### `${addToREADMEInsertions} == "middle"`
* If `${addToREADME}` is true, then insert the coding standards data at the **middle** of the `README.md` file, changing the standards title heading to match that of the `README.md` composition.
### `${addToREADMEInsertions} == "beforeEnd"`
* If `${addToREADME}` is true, then insert the coding standards data at the **end** of the `README.md` file, inserting a new line after the last character, then inserting the data on a new line.
### `${addToREADMEInsertions} == "bestFitUsingContext"`
* If `${addToREADME}` is true, then insert the coding standards data at the **best fitting line** of the `README.md` file in regards to the context of the `README.md` composition and flow of data.
### `${addStandardsTest} == true`
* Once the coding standards file is complete, write a test file to ensure the file or files passed to it adhere to the coding standards.
### `${createNewFile} == true`
* Create a new file using the value, or one of the possible values, from `${newFileName}`.
* If true, toggle both `${outputSpecToPrompt}` and `${addToREADME}` to false.
### `${fetchStyleURL} == true`
* Additionally use the data fetched from the links nested under level three heading `### Fetch Links` as context for creating standards, specifications, and styling data for the new file, prompt, or `README.md`.
* For each relevant item in `### Fetch Links`, run `#fetch ${item}`.
### `${findInconsistencies} == true`
* Evaluate syntax related to indentations, line-breaks, comments, conditional and function nesting, quotation wrappers i.e. `'` or `"` for strings, etc., and categorize.
* For each category, make a count, and if one item does not match the majority of the count, then record a brief inconsistency summary in temporary working memory.
* Depending on the status of `${fixInconsistencies}`, either output the inconsistencies stored in temporary working memory or prepare a reviewed diff for explicitly approved target files.
### `${fixInconsistencies} == true`
* Only edit analyzed source files when the collaborator explicitly requests edits or confirms that edits are allowed for the named target files.
* Respect `${requireEditConfirmation}` and present or review the generated diff before the collaborator accepts the change.
* If explicit approval is missing, toggle `${fixInconsistencies}` back to false and report the inconsistencies without modifying files.
### `${requireEditConfirmation} == true`
* Before editing any analyzed source file, confirm the exact target files and review the diff with the collaborator.
### `${persistTemporaryFiles} == false`
* Keep temporary analysis data only as long as needed to generate the standards output, then remove any temporary files created during the process.
### `typeof ${newFileName} == "string"`
* If specifically defined as a `string`, create a new file using the value from `${newFileName}`.
### `typeof ${newFileName} != "string"`
* If **NOT** specifically defined as a `string`, but instead an `object` or an array, create a new file using a value from `${newFileName}` by applying this rule:
- For each file name in `${newFileName}`, if file does not exist, use that file name and `break`, else continue to the next.
### `${outputSpecToPrompt} == true`
* Output the coding standards to the prompt instead of creating a file or adding to README.
* If true, toggle both `${createNewFile}` and `${addToREADME}` to false.
### `${useTemplate} == "v" || ${useTemplate} == "verbose"`
* Use data under the level three heading `### "v", "verbose"` as guiding template when composing the data for coding standards.
### `${useTemplate} == "m" || ${useTemplate} == "minimal"`
* Use data under the level three heading `### "m", "minimal"` as guiding template when composing the data for coding standards.
### `${useTemplate} == "b" || ${useTemplate} == "best"`
* Use either the data under the level three heading `### "v", "verbose"` or `### "m", "minimal"`, depending on the data extracted from `${fileName}`, and use the best fit as guiding template when composing the data for coding standards.
### `${useTemplate} == "custom" || ${useTemplate} == "<ANY_NAME>"`
* Use the custom prompt, instructions, template, or other data passed as guiding template when composing the data for coding standards.
## **if** `${fetchStyleURL} == true`
Depending on the programming language, for each link in list below, run `#fetch (URL)`, if programming language is `${fileName} == [<Language> Style Guide]`.
### Fetch Links
- [C Style Guide](https://users.ece.cmu.edu/~eno/coding/CCodingStandard.html)
- [C# Style Guide](https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/coding-style/coding-conventions)
- [C++ Style Guide](https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines)
- [Go Style Guide](https://github.com/golang-standards/project-layout)
- [Java Style Guide](https://coderanch.com/wiki/718799/Style)
- [AngularJS App Style Guide](https://github.com/mgechev/angularjs-style-guide)
- [jQuery Style Guide](https://contribute.jquery.org/style-guide/js/)
- [JavaScript Style Guide](https://www.w3schools.com/js/js_conventions.asp)
- [JSON Style Guide](https://google.github.io/styleguide/jsoncstyleguide.xml)
- [Kotlin Style Guide](https://kotlinlang.org/docs/coding-conventions.html)
- [Markdown Style Guide](https://cirosantilli.com/markdown-style-guide/)
- [Perl Style Guide](https://perldoc.perl.org/perlstyle)
- [PHP Style Guide](https://phptherightway.com/)
- [Python Style Guide](https://peps.python.org/pep-0008/)
- [Ruby Style Guide](https://rubystyle.guide/)
- [Rust Style Guide](https://github.com/rust-lang/rust/tree/HEAD/src/doc/style-guide/src)
- [Swift Style Guide](https://www.swift.org/documentation/api-design-guidelines/)
- [TypeScript Style Guide](https://www.typescriptlang.org/docs/handbook/declaration-files/do-s-and-don-ts.html)
- [Visual Basic Style Guide](https://en.wikibooks.org/wiki/Visual_Basic/Coding_Standards)
- [Shell Script Style Guide](https://google.github.io/styleguide/shellguide.html)
- [Git Usage Style Guide](https://github.com/agis/git-style-guide)
- [PowerShell Style Guide](https://github.com/PoshCode/PowerShellPracticeAndStyle)
- [CSS](https://cssguidelin.es/)
- [Sass Style Guide](https://sass-guidelin.es/)
- [HTML Style Guide](https://github.com/marcobiedermann/html-style-guide)
- [Linux kernel Style Guide](https://www.kernel.org/doc/html/latest/process/coding-style.html)
- [Node.js Style Guide](https://github.com/felixge/node-style-guide)
- [SQL Style Guide](https://www.sqlstyle.guide/)
- [Angular Style Guide](https://angular.dev/style-guide)
- [Vue Style Guide](https://vuejs.org/style-guide/rules-strongly-recommended.html)
- [Django Style Guide](https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/)
- [SystemVerilog Style Guide](https://github.com/lowRISC/style-guides/blob/master/VerilogCodingStyle.md)
## Coding Standards Templates
### `"m", "minimal"`
```text
```markdown
## 1. Introduction
* **Purpose:** Briefly explain why the coding standards are being established (e.g., to improve code quality, maintainability, and team collaboration).
* **Scope:** Define which languages, projects, or modules this specification applies to.
## 2. Naming Conventions
* **Variables:** `camelCase`
* **Functions/Methods:** `PascalCase` or `camelCase`.
* **Classes/Structs:** `PascalCase`.
* **Constants:** `UPPER_SNAKE_CASE`.
## 3. Formatting and Style
* **Indentation:** Use 4 spaces per indent (or tabs).
* **Line Length:** Limit lines to a maximum of 80 or 120 characters.
* **Braces:** Use the "K&R" style (opening brace on the same line) or the "Allman" style (opening brace on a new line).
* **Blank Lines:** Specify how many blank lines to use for separating logical blocks of code.
## 4. Commenting
* **Docstrings/Function Comments:** Describe the function's purpose, parameters, and return values.
* **Inline Comments:** Explain complex or non-obvious logic.
* **File Headers:** Specify what information should be included in a file header, such as author, date, and file description.
## 5. Error Handling
* **General:** How to handle and log errors.
* **Specifics:** Which exception types to use, and what information to include in error messages.
## 6. Best Practices and Anti-Patterns
* **General:** List common anti-patterns to avoid (e.g., global variables, magic numbers).
* **Language-specific:** Specific recommendations based on the project's programming language.
## 7. Examples
* Provide a small code example demonstrating the correct application of the rules.
* Provide a small code example of an incorrect implementation and how to fix it.
## 8. Contribution and Enforcement
* Explain how the standards are to be enforced (e.g., via code reviews).
* Provide a guide for contributing to the standards document itself.
```
```
### `"v", verbose"`
```text
```markdown
# Style Guide
This document defines the style and conventions used in this project.
All contributions should follow these rules unless otherwise noted.
## 1. General Code Style
- Favor clarity over brevity.
- Keep functions and methods small and focused.
- Avoid repeating logic; prefer shared helpers/utilities.
- Remove unused variables, imports, code paths, and files.
## 2. Naming Conventions
Use descriptive names. Avoid abbreviations unless well-known.
| Item | Convention | Example |
|-----------------|----------------------|--------------------|
| Variables | `lower_snake_case` | `buffer_size` |
| Functions | `lower_snake_case()` | `read_file()` |
| Constants | `UPPER_SNAKE_CASE` | `MAX_RETRIES` |
| Types/Structs | `PascalCase` | `FileHeader` |
| File Names | `lower_snake_case` | `file_reader.c` |
## 3. Formatting Rules
- Indentation: **4 spaces**
- Line length: **max 100 characters**
- Encoding: **UTF-8**, no BOM
- End files with a newline
### Braces (example in C, adjust for your language)
```c
if (condition) {
do_something();
} else {
do_something_else();
}
```
### Spacing
- One space after keywords: `if (x)`, not `if(x)`
- One blank line between top-level functions
## 4. Comments & Documentation
- Explain *why*, not *what*, unless intent is unclear.
- Keep comments up-to-date as code changes.
- Public functions should include a short description of purpose and parameters.
Recommended tags:
```text
TODO: follow-up work
FIXME: known incorrect behavior
NOTE: non-obvious design decision
```
## 5. Error Handling
- Handle error conditions explicitly.
- Avoid silent failures; either return errors or log them appropriately.
- Clean up resources (files, memory, handles) before returning on failure.
## 6. Commit & Review Practices
### Commits
- One logical change per commit.
- Write clear commit messages:
```text
Short summary (max ~50 chars)
Optional longer explanation of context and rationale.
```
### Reviews
- Keep pull requests reasonably small.
- Be respectful and constructive in review discussions.
- Address requested changes or explain if you disagree.
## 7. Tests
- Write tests for new functionality.
- Tests should be deterministic (no randomness without seeding).
- Prefer readable test cases over complex test abstraction.
## 8. Changes to This Guide
Style evolves.
Propose improvements by opening an issue or sending a patch updating this document.
```
```
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