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{ existsSync } from \"node:fs\";\nimport { delimiter } from \"node:path\";\nimport { spawn, spawnSync } from \"child_process\";\nimport { getBinDir } from \"../config.js\";\n\nexport interface ShellConfig {\n\tshell: string;\n\targs: string[];\n}\n\n/**\n * Find bash executable on PATH (cross-platform)\n */\nfunction findBashOnPath(): string | null {\n\tif (process.platform === \"win32\") {\n\t\t// Windows: Use 'where' and verify file exists (where can return non-existent paths)\n\t\ttry {\n\t\t\tconst result = spawnSync(\"where\", [\"bash.exe\"], { encoding: \"utf-8\", timeout: 5000 });\n\t\t\tif (result.status === 0 && result.stdout) {\n\t\t\t\tconst firstMatch = result.stdout.trim().split(/\\r?\\n/)[0];\n\t\t\t\tif (firstMatch && existsSync(firstMatch)) {\n\t\t\t\t\treturn firstMatch;\n\t\t\t\t}\n\t\t\t}\n\t\t} catch {\n\t\t\t// Ignore errors\n\t\t}\n\t\treturn null;\n\t}\n\n\t// Unix: Use 'which' and trust its output (handles Termux and special filesystems)\n\ttry {\n\t\tconst result = spawnSync(\"which\", [\"bash\"], { encoding: \"utf-8\", timeout: 5000 });\n\t\tif (result.status === 0 && result.stdout) {\n\t\t\tconst firstMatch = result.stdout.trim().split(/\\r?\\n/)[0];\n\t\t\tif (firstMatch) {\n\t\t\t\treturn firstMatch;\n\t\t\t}\n\t\t}\n\t} catch {\n\t\t// Ignore errors\n\t}\n\treturn null;\n}\n\n/**\n * Resolve shell configuration based on platform and an optional explicit shell path.\n * Resolution order:\n * 1. User-specified shellPath\n * 2. On Windows: Git Bash in known locations, then bash on PATH\n * 3. On Unix: /bin/bash, then bash on PATH, then fallback to sh\n */\nexport function getShellConfig(customShellPath?: string): ShellConfig {\n\t// 1. Check user-specified shell path\n\tif (customShellPath) {\n\t\tif (existsSync(customShellPath)) {\n\t\t\treturn { shell: customShellPath, args: [\"-c\"] };\n\t\t}\n\t\tthrow new Error(`Custom shell path not found: ${customShellPath}`);\n\t}\n\n\tif (process.platform === \"win32\") {\n\t\t// 2. Try Git Bash in known locations\n\t\tconst paths: string[] = [];\n\t\tconst programFiles = process.env.ProgramFiles;\n\t\tif (programFiles) {\n\t\t\tpaths.push(`${programFiles}\\\\Git\\\\bin\\\\bash.exe`);\n\t\t}\n\t\tconst programFilesX86 = process.env[\"ProgramFiles(x86)\"];\n\t\tif (programFilesX86) {\n\t\t\tpaths.push(`${programFilesX86}\\\\Git\\\\bin\\\\bash.exe`);\n\t\t}\n\n\t\tfor (const path of paths) {\n\t\t\tif (existsSync(path)) {\n\t\t\t\treturn { shell: path, args: [\"-c\"] };\n\t\t\t}\n\t\t}\n\n\t\t// 3. Fallback: search bash.exe on PATH (Cygwin, MSYS2, WSL, etc.)\n\t\tconst bashOnPath = findBashOnPath();\n\t\tif (bashOnPath) {\n\t\t\treturn { shell: bashOnPath, args: [\"-c\"] };\n\t\t}\n\n\t\tthrow new Error(\n\t\t\t`No bash shell found. Options:\\n` +\n\t\t\t\t`  1. Install Git for Windows: https://git-scm.com/download/win\\n` +\n\t\t\t\t`  2. Add your bash to PATH (Cygwin, MSYS2, etc.)\\n` +\n\t\t\t\t\"  3. Set shellPath in settings.json\\n\\n\" +\n\t\t\t\t`Searched Git Bash in:\\n${paths.map((p) => `  ${p}`).join(\"\\n\")}`,\n\t\t);\n\t}\n\n\t// Unix: try /bin/bash, then bash on PATH, then fallback to sh\n\tif (existsSync(\"/bin/bash\")) {\n\t\treturn { shell: \"/bin/bash\", args: [\"-c\"] };\n\t}\n\n\tconst bashOnPath = findBashOnPath();\n\tif (bashOnPath) {\n\t\treturn { shell: bashOnPath, args: [\"-c\"] };\n\t}\n\n\treturn { shell: \"sh\", args: [\"-c\"] };\n}\n\nexport function getShellEnv(): NodeJS.ProcessEnv {\n\tconst binDir = getBinDir();\n\tconst pathKey = Object.keys(process.env).find((key) => key.toLowerCase() === \"path\") ?? \"PATH\";\n\tconst currentPath = process.env[pathKey] ?? \"\";\n\tconst pathEntries = currentPath.split(delimiter).filter(Boolean);\n\tconst hasBinDir = pathEntries.includes(binDir);\n\tconst updatedPath = hasBinDir ? currentPath : [binDir, currentPath].filter(Boolean).join(delimiter);\n\n\treturn {\n\t\t...process.env,\n\t\t[pathKey]: updatedPath,\n\t};\n}\n\n/**\n * Sanitize binary output for display/storage.\n * Removes characters that crash string-width or cause display issues:\n * - Control characters (except tab, newline, carriage return)\n * - Lone surrogates\n * - Unicode Format characters (crash string-width due to a bug)\n * - Characters with undefined code points\n */\nexport function sanitizeBinaryOutput(str: string): string {\n\t// Use Array.from to properly iterate over code points (not code units)\n\t// This handles surrogate pairs correctly and catches edge cases where\n\t// codePointAt() might return undefined\n\treturn Array.from(str)\n\t\t.filter((char) => {\n\t\t\t// Filter out characters that cause string-width to crash\n\t\t\t// This includes:\n\t\t\t// - Unicode format characters\n\t\t\t// - Lone surrogates (already filtered by Array.from)\n\t\t\t// - Control chars except \\t \\n \\r\n\t\t\t// - Characters with undefined code points\n\n\t\t\tconst code = char.codePointAt(0);\n\n\t\t\t// Skip if code point is undefined (edge case with invalid strings)\n\t\t\tif (code === undefined) return false;\n\n\t\t\t// Allow tab, newline, carriage return\n\t\t\tif (code === 0x09 || code === 0x0a || code === 0x0d) return true;\n\n\t\t\t// Filter out control characters (0x00-0x1F, except 0x09, 0x0a, 0x0x0d)\n\t\t\tif (code <= 0x1f) return false;\n\n\t\t\t// Filter out Unicode format characters\n\t\t\tif (code >= 0xfff9 && code <= 0xfffb) return false;\n\n\t\t\treturn true;\n\t\t})\n\t\t.join(\"\");\n}\n\n/**\n * Detached child processes must be tracked so they can be killed on parent\n * shutdown signals (SIGHUP/SIGTERM).\n */\nconst trackedDetachedChildPids = new Set<number>();\n\nexport function trackDetachedChildPid(pid: number): void {\n\ttrackedDetachedChildPids.add(pid);\n}\n\nexport function untrackDetachedChildPid(pid: number): void {\n\ttrackedDetachedChildPids.delete(pid);\n}\n\nexport function killTrackedDetachedChildren(): void {\n\tfor (const pid of trackedDetachedChildPids) {\n\t\tkillProcessTree(pid);\n\t}\n\ttrackedDetachedChildPids.clear();\n}\n\n/**\n * Kill a process and all its children (cross-platform)\n */\nexport function killProcessTree(pid: number): void {\n\tif (process.platform === \"win32\") {\n\t\t// Use taskkill on Windows to kill process tree\n\t\ttry {\n\t\t\tspawn(\"taskkill\", [\"/F\", \"/T\", \"/PID\", String(pid)], {\n\t\t\t\tstdio: \"ignore\",\n\t\t\t\tdetached: true,\n\t\t\t});\n\t\t} catch {\n\t\t\t// Ignore errors if taskkill fails\n\t\t}\n\t} else {\n\t\t// Use SIGKILL on Unix/Linux/Mac\n\t\ttry {\n\t\t\tprocess.kill(-pid, \"SIGKILL\");\n\t\t} catch {\n\t\t\t// Fallback to killing just the child if process group kill fails\n\t\t\ttry {\n\t\t\t\tprocess.kill(pid, \"SIGKILL\");\n\t\t\t} catch {\n\t\t\t\t// Process already dead\n\t\t\t}\n\t\t}\n\t}\n}\n"]}