mirror of
https://github.com/oven-sh/bun
synced 2026-02-02 15:08:46 +00:00
Add comprehensive CLI flag parser for shell completions (#21604)
## Summary This PR adds a comprehensive TypeScript CLI flag parser that reads the `--help` menu for every Bun command and generates structured JSON data for shell completion generators. ### Features - **🔍 Complete command discovery**: Automatically discovers all 22 Bun commands - **📋 Comprehensive flag parsing**: Extracts 388+ flags with descriptions, types, defaults, and choices - **🌳 Nested subcommand support**: Handles complex cases like `bun pm cache rm`, `bun pm pkg set` - **🔗 Command aliases**: Supports `bun i` = `bun install`, `bun a` = `bun add`, etc. - **🎯 Dynamic completions**: Integrates with `bun getcompletes` for scripts, packages, files, binaries - **📂 File type awareness**: Knows when to complete `.js/.ts` files vs test files vs packages - **⚡ Special case handling**: Handles bare `bun` vs `bun run` and other edge cases ### Generated Output The script generates `completions/bun-cli.json` with: - 21 commands with full metadata - 47 global flags - 16 pm subcommands (including nested ones) - 54+ examples - Dynamic completion hints - Integration info for existing shell completions ### Usage ```bash bun run scripts/generate-cli-completions.ts ``` Output saved to `completions/bun-cli.json` for use by future shell completion generators. ### Perfect Shell Completions Ready This JSON structure provides everything needed to generate perfect shell completions for fish, bash, and zsh with full feature parity to the existing hand-crafted completions. It captures all the complex cases that make Bun's CLI completions work seamlessly. The generated data structure includes: - Context-aware flag suggestions - Proper file type filtering - Package name completions - Script and binary discovery - Subcommand nesting - Alias handling - Dynamic completion integration 🤖 Generated with [Claude Code](https://claude.ai/code) --------- Co-authored-by: Claude Bot <claude-bot@bun.sh> Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com> Co-authored-by: Jarred Sumner <jarred@jarredsumner.com> Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>
This commit is contained in:
robobun
4026
completions/bun-cli.json
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4026
completions/bun-cli.json
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File diff suppressed because it is too large
Load Diff
724
misctools/generate-cli-completions.ts
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724
misctools/generate-cli-completions.ts
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@@ -0,0 +1,724 @@
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#!/usr/bin/env bun
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/**
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* CLI Flag Parser for Bun Commands
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*
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* This script reads the --help menu for every Bun command and generates JSON
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* containing all flag information, descriptions, and whether they support
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* positional or non-positional arguments.
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*
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* Handles complex cases like:
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* - Nested subcommands (bun pm cache rm)
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* - Command aliases (bun i = bun install, bun a = bun add)
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* - Dynamic completions (scripts, packages, files)
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* - Context-aware flags
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* - Special cases like bare 'bun' vs 'bun run'
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*
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* Output is saved to completions/bun-cli.json for use in generating
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* shell completions (fish, bash, zsh).
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*/
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import { spawn } from "bun";
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import { mkdirSync, writeFileSync, mkdtempSync, rmSync } from "fs";
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import { join } from "path";
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interface FlagInfo {
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name: string;
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shortName?: string;
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description: string;
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hasValue: boolean;
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valueType?: string;
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defaultValue?: string;
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choices?: string[];
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required?: boolean;
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multiple?: boolean;
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}
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interface SubcommandInfo {
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name: string;
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description: string;
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flags?: FlagInfo[];
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subcommands?: Record<string, SubcommandInfo>;
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positionalArgs?: {
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name: string;
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description?: string;
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required: boolean;
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multiple: boolean;
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type?: string;
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completionType?: string;
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}[];
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examples?: string[];
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}
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interface CommandInfo {
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name: string;
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aliases?: string[];
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description: string;
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usage?: string;
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flags: FlagInfo[];
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positionalArgs: {
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name: string;
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description?: string;
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required: boolean;
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multiple: boolean;
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type?: string;
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completionType?: string;
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}[];
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examples: string[];
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subcommands?: Record<string, SubcommandInfo>;
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documentationUrl?: string;
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dynamicCompletions?: {
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scripts?: boolean;
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packages?: boolean;
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files?: boolean;
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binaries?: boolean;
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};
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}
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interface CompletionData {
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version: string;
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commands: Record<string, CommandInfo>;
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globalFlags: FlagInfo[];
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specialHandling: {
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bareCommand: {
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description: string;
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canRunFiles: boolean;
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dynamicCompletions: {
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scripts: boolean;
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files: boolean;
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binaries: boolean;
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};
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};
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};
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bunGetCompletes: {
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available: boolean;
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commands: {
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scripts: string; // "bun getcompletes s" or "bun getcompletes z"
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binaries: string; // "bun getcompletes b"
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packages: string; // "bun getcompletes a <prefix>"
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files: string; // "bun getcompletes j"
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};
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};
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}
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const BUN_EXECUTABLE = process.env.BUN_DEBUG_BUILD || "bun";
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/**
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* Parse flag line from help output
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*/
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function parseFlag(line: string): FlagInfo | null {
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// Match patterns like:
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// -h, --help Display this menu and exit
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// --timeout=<val> Set the per-test timeout in milliseconds, default is 5000.
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// -r, --preload=<val> Import a module before other modules are loaded
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// --watch Automatically restart the process on file change
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const patterns = [
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// Long flag with short flag and value: -r, --preload=<val>
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/^\s*(-[a-zA-Z]),\s+(--[a-zA-Z-]+)=(<[^>]+>)\s+(.+)$/,
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// Long flag with short flag: -h, --help
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/^\s*(-[a-zA-Z]),\s+(--[a-zA-Z-]+)\s+(.+)$/,
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// Long flag with value: --timeout=<val>
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/^\s+(--[a-zA-Z-]+)=(<[^>]+>)\s+(.+)$/,
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// Long flag without value: --watch
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/^\s+(--[a-zA-Z-]+)\s+(.+)$/,
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// Short flag only: -i
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/^\s+(-[a-zA-Z])\s+(.+)$/,
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];
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for (const pattern of patterns) {
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const match = line.match(pattern);
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if (match) {
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let shortName: string | undefined;
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let longName: string;
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let valueSpec: string | undefined;
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let description: string;
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if (match.length === 5) {
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// Pattern with short flag, long flag, and value
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[, shortName, longName, valueSpec, description] = match;
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} else if (match.length === 4) {
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if (match[1].startsWith("-") && match[1].length === 2) {
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// Short flag with long flag
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[, shortName, longName, description] = match;
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} else if (match[2].startsWith("<")) {
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// Long flag with value
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[, longName, valueSpec, description] = match;
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} else {
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// Long flag without value
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[, longName, description] = match;
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}
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} else if (match.length === 3) {
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if (match[1].length === 2) {
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// Short flag only
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[, shortName, description] = match;
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longName = shortName.replace("-", "--");
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} else {
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// Long flag without value
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[, longName, description] = match;
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}
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} else {
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continue;
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}
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// Extract additional info from description
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const hasValue = !!valueSpec;
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let valueType: string | undefined;
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let defaultValue: string | undefined;
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let choices: string[] | undefined;
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if (valueSpec) {
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valueType = valueSpec.replace(/[<>]/g, "");
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}
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// Look for default values in description
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const defaultMatch = description.match(/[Dd]efault(?:s?)\s*(?:is|to|:)\s*"?([^".\s,]+)"?/);
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if (defaultMatch) {
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defaultValue = defaultMatch[1];
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}
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// Look for choices/enums
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const choicesMatch = description.match(/(?:One of|Valid (?:orders?|values?|options?)):?\s*"?([^"]+)"?/);
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if (choicesMatch) {
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choices = choicesMatch[1]
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.split(/[,\s]+/)
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.map(s => s.replace(/[",]/g, "").trim())
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.filter(Boolean);
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}
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return {
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name: longName.replace(/^--/, ""),
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shortName: shortName?.replace(/^-/, ""),
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description: description.trim(),
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hasValue,
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valueType,
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defaultValue,
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choices,
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required: false, // We'll determine this from usage patterns
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multiple: description.toLowerCase().includes("multiple") || description.includes("[]"),
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};
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}
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}
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return null;
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}
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/**
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* Parse usage line to extract positional arguments
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*/
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function parseUsage(usage: string): {
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name: string;
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description?: string;
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required: boolean;
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multiple: boolean;
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type?: string;
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completionType?: string;
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}[] {
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const args: {
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name: string;
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description?: string;
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required: boolean;
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multiple: boolean;
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type?: string;
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completionType?: string;
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}[] = [];
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// Extract parts after command name
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const parts = usage.split(/\s+/).slice(2); // Skip "Usage:" and command name
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for (const part of parts) {
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if (part.startsWith("[") || part.startsWith("<") || part.includes("...")) {
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let name = part;
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let required = false;
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let multiple = false;
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let completionType: string | undefined;
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// Clean up the argument name
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name = name.replace(/[\[\]<>]/g, "");
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if (part.startsWith("<")) {
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required = true;
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}
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if (part.includes("...") || name.includes("...")) {
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multiple = true;
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name = name.replace(/\.{3}/g, "");
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}
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// Skip flags
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if (!name.startsWith("-") && name.length > 0) {
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// Determine completion type based on argument name
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if (name.toLowerCase().includes("package")) {
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completionType = "package";
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} else if (name.toLowerCase().includes("script")) {
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completionType = "script";
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} else if (name.toLowerCase().includes("file") || name.includes(".")) {
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completionType = "file";
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}
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args.push({
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name,
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required,
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multiple,
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type: "string", // Default type
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completionType,
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});
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}
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}
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}
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return args;
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}
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const temppackagejson = mkdtempSync("package");
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writeFileSync(
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join(temppackagejson, "package.json"),
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JSON.stringify({
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name: "test",
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version: "1.0.0",
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scripts: {},
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}),
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);
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process.once("beforeExit", () => {
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rmSync(temppackagejson, { recursive: true });
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});
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/**
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* Execute bun command and get help output
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*/
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async function getHelpOutput(command: string[]): Promise<string> {
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try {
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const proc = spawn({
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cmd: [BUN_EXECUTABLE, ...command, "--help"],
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stdout: "pipe",
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stderr: "pipe",
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cwd: temppackagejson,
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});
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const [stdout, stderr] = await Promise.all([new Response(proc.stdout).text(), new Response(proc.stderr).text()]);
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await proc.exited;
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return stdout || stderr || "";
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} catch (error) {
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console.error(`Failed to get help for command: ${command.join(" ")}`, error);
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return "";
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}
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}
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/**
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* Parse PM subcommands from help output
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*/
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function parsePmSubcommands(helpText: string): Record<string, SubcommandInfo> {
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const lines = helpText.split("\n");
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const subcommands: Record<string, SubcommandInfo> = {};
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let inCommands = false;
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for (const line of lines) {
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const trimmed = line.trim();
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if (trimmed === "Commands:") {
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inCommands = true;
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continue;
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}
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if (inCommands && trimmed.startsWith("Learn more")) {
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break;
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}
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if (inCommands && line.match(/^\s+bun pm \w+/)) {
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// Parse lines like: "bun pm pack create a tarball of the current workspace"
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const match = line.match(/^\s+bun pm (\S+)(?:\s+(.+))?$/);
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if (match) {
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const [, name, description = ""] = match;
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subcommands[name] = {
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name,
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description: description.trim(),
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flags: [],
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positionalArgs: [],
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};
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// Special handling for subcommands with their own subcommands
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if (name === "cache") {
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subcommands[name].subcommands = {
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rm: {
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name: "rm",
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description: "clear the cache",
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},
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};
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} else if (name === "pkg") {
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subcommands[name].subcommands = {
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get: { name: "get", description: "get values from package.json" },
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set: { name: "set", description: "set values in package.json" },
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delete: { name: "delete", description: "delete keys from package.json" },
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fix: { name: "fix", description: "auto-correct common package.json errors" },
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};
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}
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}
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}
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}
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return subcommands;
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}
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/**
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* Parse help output into CommandInfo
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*/
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function parseHelpOutput(helpText: string, commandName: string): CommandInfo {
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const lines = helpText.split("\n");
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const command: CommandInfo = {
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name: commandName,
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description: "",
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flags: [],
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positionalArgs: [],
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examples: [],
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};
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let currentSection = "";
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let inFlags = false;
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let inExamples = false;
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for (let i = 0; i < lines.length; i++) {
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const line = lines[i];
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const trimmed = line.trim();
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// Extract command description (usually the first non-usage line)
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if (
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!command.description &&
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trimmed &&
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!trimmed.startsWith("Usage:") &&
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!trimmed.startsWith("Alias:") &&
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currentSection === ""
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) {
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command.description = trimmed;
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continue;
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}
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// Extract aliases
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if (trimmed.startsWith("Alias:")) {
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const aliasMatch = trimmed.match(/Alias:\s*(.+)/);
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if (aliasMatch) {
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command.aliases = aliasMatch[1]
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.split(/[,\s]+/)
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.map(a => a.trim())
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.filter(Boolean);
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}
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continue;
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}
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// Extract usage and positional args
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if (trimmed.startsWith("Usage:")) {
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command.usage = trimmed;
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command.positionalArgs = parseUsage(trimmed);
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continue;
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}
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// Track sections
|
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if (trimmed === "Flags:") {
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inFlags = true;
|
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currentSection = "flags";
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continue;
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} else if (trimmed === "Examples:") {
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inExamples = true;
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inFlags = false;
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currentSection = "examples";
|
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continue;
|
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} else if (
|
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trimmed.startsWith("Full documentation") ||
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trimmed.startsWith("Learn more") ||
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trimmed.startsWith("A full list")
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) {
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const urlMatch = trimmed.match(/https?:\/\/[^\s]+/);
|
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if (urlMatch) {
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command.documentationUrl = urlMatch[0];
|
||||
}
|
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inFlags = false;
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inExamples = false;
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continue;
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}
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|
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// Parse flags
|
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if (inFlags && line.match(/^\s+(-|\s+--)/)) {
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const flag = parseFlag(line);
|
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if (flag) {
|
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command.flags.push(flag);
|
||||
}
|
||||
}
|
||||
|
||||
// Parse examples
|
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if (inExamples && trimmed && !trimmed.startsWith("Full documentation")) {
|
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if (trimmed.startsWith("bun ") || trimmed.startsWith("./") || trimmed.startsWith("Bundle")) {
|
||||
command.examples.push(trimmed);
|
||||
}
|
||||
}
|
||||
}
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||||
|
||||
// Special case for pm command
|
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if (commandName === "pm") {
|
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command.subcommands = parsePmSubcommands(helpText);
|
||||
}
|
||||
|
||||
// Add dynamic completion info based on command
|
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command.dynamicCompletions = {};
|
||||
if (commandName === "run") {
|
||||
command.dynamicCompletions.scripts = true;
|
||||
command.dynamicCompletions.files = true;
|
||||
command.dynamicCompletions.binaries = true;
|
||||
// Also add file type info for positional args
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name.includes("file") || arg.name.includes("script")) {
|
||||
arg.completionType = "javascript_files";
|
||||
}
|
||||
}
|
||||
} else if (commandName === "add") {
|
||||
command.dynamicCompletions.packages = true;
|
||||
// Mark package args
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name.includes("package") || arg.name === "name") {
|
||||
arg.completionType = "package";
|
||||
}
|
||||
}
|
||||
} else if (commandName === "remove") {
|
||||
command.dynamicCompletions.packages = true; // installed packages
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name.includes("package") || arg.name === "name") {
|
||||
arg.completionType = "installed_package";
|
||||
}
|
||||
}
|
||||
} else if (["test"].includes(commandName)) {
|
||||
command.dynamicCompletions.files = true;
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name.includes("pattern") || arg.name.includes("file")) {
|
||||
arg.completionType = "test_files";
|
||||
}
|
||||
}
|
||||
} else if (["build"].includes(commandName)) {
|
||||
command.dynamicCompletions.files = true;
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name === "entrypoint" || arg.name.includes("file")) {
|
||||
arg.completionType = "javascript_files";
|
||||
}
|
||||
}
|
||||
} else if (commandName === "create") {
|
||||
// Create has special template completions
|
||||
for (const arg of command.positionalArgs) {
|
||||
if (arg.name.includes("template")) {
|
||||
arg.completionType = "create_template";
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return command;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get list of main commands from bun --help
|
||||
*/
|
||||
async function getMainCommands(): Promise<string[]> {
|
||||
const helpText = await getHelpOutput([]);
|
||||
const lines = helpText.split("\n");
|
||||
const commands: string[] = [];
|
||||
|
||||
let inCommands = false;
|
||||
for (const line of lines) {
|
||||
const trimmed = line.trim();
|
||||
|
||||
if (trimmed === "Commands:") {
|
||||
inCommands = true;
|
||||
continue;
|
||||
}
|
||||
|
||||
// Stop when we hit the "Flags:" section
|
||||
if (inCommands && trimmed === "Flags:") {
|
||||
break;
|
||||
}
|
||||
|
||||
if (inCommands && line.match(/^\s+\w+/)) {
|
||||
// Extract command name (first word after whitespace)
|
||||
const match = line.match(/^\s+(\w+)/);
|
||||
if (match) {
|
||||
commands.push(match[1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
const commandsToRemove = ["lint"];
|
||||
|
||||
return commands.filter(a => {
|
||||
if (commandsToRemove.includes(a)) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Extract global flags from main help
|
||||
*/
|
||||
function parseGlobalFlags(helpText: string): FlagInfo[] {
|
||||
const lines = helpText.split("\n");
|
||||
const flags: FlagInfo[] = [];
|
||||
|
||||
let inFlags = false;
|
||||
for (const line of lines) {
|
||||
const trimmed = line.trim();
|
||||
|
||||
if (trimmed === "Flags:") {
|
||||
inFlags = true;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (inFlags && (trimmed === "" || trimmed.startsWith("("))) {
|
||||
break;
|
||||
}
|
||||
|
||||
if (inFlags && line.match(/^\s+(-|\s+--)/)) {
|
||||
const flag = parseFlag(line);
|
||||
if (flag) {
|
||||
flags.push(flag);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return flags;
|
||||
}
|
||||
|
||||
/**
|
||||
* Add command aliases based on common patterns
|
||||
*/
|
||||
function addCommandAliases(commands: Record<string, CommandInfo>): void {
|
||||
const aliasMap: Record<string, string[]> = {
|
||||
"install": ["i"],
|
||||
"add": ["a"],
|
||||
"remove": ["rm"],
|
||||
"create": ["c"],
|
||||
"x": ["bunx"], // bunx is an alias for bun x
|
||||
};
|
||||
|
||||
for (const [command, aliases] of Object.entries(aliasMap)) {
|
||||
if (commands[command]) {
|
||||
commands[command].aliases = aliases;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Main function to generate completion data
|
||||
*/
|
||||
async function generateCompletions(): Promise<void> {
|
||||
console.log("🔍 Discovering Bun commands...");
|
||||
|
||||
// Get main help and extract commands
|
||||
const mainHelpText = await getHelpOutput([]);
|
||||
const mainCommands = await getMainCommands();
|
||||
const globalFlags = parseGlobalFlags(mainHelpText);
|
||||
|
||||
console.log(`📋 Found ${mainCommands.length} main commands: ${mainCommands.join(", ")}`);
|
||||
|
||||
const completionData: CompletionData = {
|
||||
version: "1.1.0",
|
||||
commands: {},
|
||||
globalFlags,
|
||||
specialHandling: {
|
||||
bareCommand: {
|
||||
description: "Run JavaScript/TypeScript files directly or access package scripts and binaries",
|
||||
canRunFiles: true,
|
||||
dynamicCompletions: {
|
||||
scripts: true,
|
||||
files: true,
|
||||
binaries: true,
|
||||
},
|
||||
},
|
||||
},
|
||||
bunGetCompletes: {
|
||||
available: true,
|
||||
commands: {
|
||||
scripts: "bun getcompletes s", // or "bun getcompletes z" for scripts with descriptions
|
||||
binaries: "bun getcompletes b",
|
||||
packages: "bun getcompletes a", // takes prefix as argument
|
||||
files: "bun getcompletes j", // JavaScript/TypeScript files
|
||||
},
|
||||
},
|
||||
};
|
||||
|
||||
// Parse each command
|
||||
for (const commandName of mainCommands) {
|
||||
console.log(`📖 Parsing help for: ${commandName}`);
|
||||
|
||||
try {
|
||||
const helpText = await getHelpOutput([commandName]);
|
||||
if (helpText.trim()) {
|
||||
const commandInfo = parseHelpOutput(helpText, commandName);
|
||||
completionData.commands[commandName] = commandInfo;
|
||||
}
|
||||
} catch (error) {
|
||||
console.error(`❌ Failed to parse ${commandName}:`, error);
|
||||
}
|
||||
}
|
||||
|
||||
// Add common aliases
|
||||
addCommandAliases(completionData.commands);
|
||||
|
||||
// Also check some common subcommands that might have their own help
|
||||
const additionalCommands = ["pm"];
|
||||
for (const commandName of additionalCommands) {
|
||||
if (!completionData.commands[commandName]) {
|
||||
console.log(`📖 Parsing help for additional command: ${commandName}`);
|
||||
|
||||
try {
|
||||
const helpText = await getHelpOutput([commandName]);
|
||||
if (helpText.trim() && !helpText.includes("error:") && !helpText.includes("Error:")) {
|
||||
const commandInfo = parseHelpOutput(helpText, commandName);
|
||||
completionData.commands[commandName] = commandInfo;
|
||||
}
|
||||
} catch (error) {
|
||||
console.error(`❌ Failed to parse ${commandName}:`, error);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Ensure completions directory exists
|
||||
const completionsDir = join(process.cwd(), "completions");
|
||||
try {
|
||||
mkdirSync(completionsDir, { recursive: true });
|
||||
} catch (error) {
|
||||
// Directory might already exist
|
||||
}
|
||||
|
||||
// Write the JSON file
|
||||
const outputPath = join(completionsDir, "bun-cli.json");
|
||||
const jsonData = JSON.stringify(completionData, null, 2);
|
||||
|
||||
writeFileSync(outputPath, jsonData, "utf8");
|
||||
|
||||
console.log(`✅ Generated CLI completion data at: ${outputPath}`);
|
||||
console.log(`📊 Statistics:`);
|
||||
console.log(` - Commands: ${Object.keys(completionData.commands).length}`);
|
||||
console.log(` - Global flags: ${completionData.globalFlags.length}`);
|
||||
|
||||
let totalFlags = 0;
|
||||
let totalExamples = 0;
|
||||
let totalSubcommands = 0;
|
||||
for (const [name, cmd] of Object.entries(completionData.commands)) {
|
||||
totalFlags += cmd.flags.length;
|
||||
totalExamples += cmd.examples.length;
|
||||
const subcommandCount = cmd.subcommands ? Object.keys(cmd.subcommands).length : 0;
|
||||
totalSubcommands += subcommandCount;
|
||||
|
||||
const aliasInfo = cmd.aliases ? ` (aliases: ${cmd.aliases.join(", ")})` : "";
|
||||
const subcommandInfo = subcommandCount > 0 ? `, ${subcommandCount} subcommands` : "";
|
||||
const dynamicInfo = cmd.dynamicCompletions ? ` [dynamic: ${Object.keys(cmd.dynamicCompletions).join(", ")}]` : "";
|
||||
|
||||
console.log(
|
||||
` - ${name}${aliasInfo}: ${cmd.flags.length} flags, ${cmd.positionalArgs.length} positional args, ${cmd.examples.length} examples${subcommandInfo}${dynamicInfo}`,
|
||||
);
|
||||
}
|
||||
|
||||
console.log(` - Total command flags: ${totalFlags}`);
|
||||
console.log(` - Total examples: ${totalExamples}`);
|
||||
console.log(` - Total subcommands: ${totalSubcommands}`);
|
||||
}
|
||||
|
||||
// Run the script
|
||||
if (import.meta.main) {
|
||||
generateCompletions().catch(console.error);
|
||||
}
|
||||
Reference in New Issue
Block a user