ast-grep-find

AST-Grep Find

Structural code search that understands syntax. Find patterns like function calls, imports, class definitions - not just text.

When to Use

• Find code patterns (ignores strings/comments)
• Search for function calls, class definitions, imports
• Refactor code with AST precision
• Rename variables/functions across codebase

Usage

Search for a pattern

uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "import asyncio" --language python

Search in specific directory

uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "async def \$FUNC(\$\$\$)" --language python --path "./src"

Refactor/replace pattern

uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "console.log(\$MSG)" --replace "logger.info(\$MSG)" \
    --language javascript

Dry run (preview changes)

uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "print(\$X)" --replace "logger.info(\$X)" \
    --language python --dry-run

Parameters

| Parameter | Description | |-----------|-------------| | --pattern | AST pattern to search (required) | | --language | Language: python, javascript, typescript, go, etc. | | --path | Directory to search (default: .) | | --glob | File glob pattern (e.g., **/*.py) | | --replace | Replacement pattern for refactoring | | --dry-run | Preview changes without applying | | --context | Lines of context (default: 2) |

Pattern Syntax

| Syntax | Meaning | |--------|---------| | $NAME | Match single node (variable, expression) | | $$$ | Match multiple nodes (arguments, statements) | | $_ | Match any single node (wildcard) |

Examples

# Find all function definitions
uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "def \$FUNC(\$\$\$):" --language python

# Find console.log calls
uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "console.log(\$\$\$)" --language javascript

# Replace print with logging
uv run python -m runtime.harness scripts/ast_grep_find.py \
    --pattern "print(\$X)" --replace "logging.info(\$X)" \
    --language python --dry-run

vs morph/warpgrep

| Tool | Best For | |------|----------| | ast-grep | Structural patterns (understands code syntax) | | warpgrep | Fast text/regex search (20x faster grep) |

Use ast-grep when you need syntax-aware matching. Use warpgrep for raw speed.

MCP Server Required

Requires ast-grep server in mcp_config.json.