| 1 | /** |
| 2 | * Parse Claude Code's event-to-matcher-group hook format into shared {@link MatcherGroup}s. |
| 3 | * Only command hooks run; other hook types are returned as skipped so the |
| 4 | * bridge can warn. Plugin-root and project-directory substitutions are applied |
| 5 | * to commands at parse time. |
| 6 | * @module @deepseek-ai/dsh-hooks-claude-code/config |
| 7 | */ |
| 8 | |
| 9 | import { matcherDiagnostic } from '../../hook-protocol/src/matcher.ts' |
| 10 | import type { MatcherGroup } from '../../hook-protocol/src/types.ts' |
| 11 | |
| 12 | const CLAUDE_EVENTS = [ |
| 13 | 'SessionStart', |
| 14 | 'UserPromptSubmit', |
| 15 | 'PreToolUse', |
| 16 | 'PostToolUse', |
| 17 | 'Stop', |
| 18 | 'SubagentStart', |
| 19 | 'SubagentStop', |
| 20 | ] as const |
| 21 | |
| 22 | /** A parsed CC config: event name → its matcher groups (command hooks only). */ |
| 23 | export type ClaudeCodeHookConfig = Record<string, MatcherGroup[]> |
| 24 | |
| 25 | /** A skipped non-command hook, surfaced so the bridge can warn about it. */ |
| 26 | export interface SkippedHook { |
| 27 | event: string |
| 28 | type: string |
| 29 | } |
| 30 | |
| 31 | /** The outcome of parsing one config file: the runnable groups + what was skipped. */ |
| 32 | export interface ParsedClaudeConfig { |
| 33 | config: ClaudeCodeHookConfig |
| 34 | skipped: SkippedHook[] |
| 35 | } |
| 36 | |
| 37 | /** Substitution variables applied to each `command` string at parse time. */ |
| 38 | export interface SubstitutionVars { |
| 39 | /** Replaces `${CLAUDE_PLUGIN_ROOT}` — the plugin's root dir. */ |
| 40 | pluginRoot?: string |
| 41 | /** Replaces `${CLAUDE_PROJECT_DIR}` — the project root. */ |
| 42 | projectDir?: string |
| 43 | } |
| 44 | |
| 45 | /** A plain (non-null, non-array) object, else undefined. */ |
| 46 | function asObject(value: unknown): Record<string, unknown> | undefined { |
| 47 | return typeof value === 'object' && value !== null && !Array.isArray(value) |
| 48 | ? value as Record<string, unknown> |
| 49 | : undefined |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Apply `${CLAUDE_PLUGIN_ROOT}` / `${CLAUDE_PROJECT_DIR}` substitution to a command string. |
| 54 | * @param command - the raw command from config. |
| 55 | * @param vars - the substitution values; a token whose variable is unset stays verbatim. |
| 56 | * @returns the command with every occurrence of each set token replaced. |
| 57 | */ |
| 58 | export function substituteCommand(command: string, vars: SubstitutionVars): string { |
| 59 | let out = command |
| 60 | if (vars.pluginRoot !== undefined) out = out.split('${CLAUDE_PLUGIN_ROOT}').join(vars.pluginRoot) |
| 61 | if (vars.projectDir !== undefined) out = out.split('${CLAUDE_PROJECT_DIR}').join(vars.projectDir) |
| 62 | return out |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Parse either a settings `hooks` value or a bare `hooks.json` event map. Malformed entries are |
| 67 | * ignored rather than failing boot; unsupported events are ignored before their groups are parsed, |
| 68 | * non-command hooks are returned in `skipped`, and substitutions are applied to every surviving |
| 69 | * command. Matcher fields on UserPromptSubmit and Stop are discarded because those events have no |
| 70 | * matcher subject. A matcher-bearing supported runnable group with an invalid regex throws a |
| 71 | * `SyntaxError`, allowing the bridge to reject the complete config before listener registration. |
| 72 | * |
| 73 | * @param raw - the parsed JSON config: a settings object with a `hooks` key, or the bare |
| 74 | * event map. |
| 75 | * @param vars - substitution values applied to every surviving `command` (defaults to |
| 76 | * none). |
| 77 | * @returns the runnable per-event groups plus the skipped non-command hooks. |
| 78 | */ |
| 79 | export function parseClaudeCodeConfig(raw: unknown, vars: SubstitutionVars = {}): ParsedClaudeConfig { |
| 80 | const config: ClaudeCodeHookConfig = {} |
| 81 | const skipped: SkippedHook[] = [] |
| 82 | // Accept either `{ hooks: { … } }` (a settings file) or the bare event map. |
| 83 | const root = asObject(raw) |
| 84 | const hooksMap = root ? asObject(root.hooks) ?? root : undefined |
| 85 | if (!hooksMap) return { config, skipped } |
| 86 | |
| 87 | for (const event of CLAUDE_EVENTS) { |
| 88 | const rawGroups = hooksMap[event] |
| 89 | if (!Array.isArray(rawGroups)) continue |
| 90 | const groups: MatcherGroup[] = [] |
| 91 | for (const rawGroup of rawGroups) { |
| 92 | const group = asObject(rawGroup) |
| 93 | if (!group || !Array.isArray(group.hooks)) continue |
| 94 | const commands: MatcherGroup['hooks'] = [] |
| 95 | for (const rawHook of group.hooks) { |
| 96 | const hook = asObject(rawHook) |
| 97 | if (!hook) continue |
| 98 | const type = typeof hook.type === 'string' ? hook.type : 'command' |
| 99 | if (type !== 'command') { |
| 100 | skipped.push({ event, type }) |
| 101 | continue |
| 102 | } |
| 103 | if (typeof hook.command !== 'string') continue |
| 104 | commands.push({ |
| 105 | command: substituteCommand(hook.command, vars), |
| 106 | ...typeof hook.timeout === 'number' ? { timeoutSec: hook.timeout } : {}, |
| 107 | }) |
| 108 | } |
| 109 | if (commands.length === 0) continue |
| 110 | const matcher = event === 'UserPromptSubmit' || event === 'Stop' |
| 111 | ? undefined |
| 112 | : typeof group.matcher === 'string' ? group.matcher : undefined |
| 113 | const diagnostic = matcherDiagnostic(matcher, 'claude-code') |
| 114 | if (diagnostic !== undefined) throw new SyntaxError(`${diagnostic} on event ${JSON.stringify(event)}`) |
| 115 | groups.push({ |
| 116 | ...matcher !== undefined ? { matcher } : {}, |
| 117 | hooks: commands, |
| 118 | }) |
| 119 | } |
| 120 | if (groups.length > 0) config[event] = groups |
| 121 | } |
| 122 | |
| 123 | return { config, skipped } |
| 124 | } |
| 125 |