patchwork

patchwork

AST-native sed. Find, replace, delete, and insert code by structure, not regex.

When to use

Use patchwork instead of sed/grep/regex when:

• Renaming functions/methods/variables across files
• Replacing API calls with different signatures
• Deleting logging/debug statements
• Matching code patterns that span multiple lines
• You need structural accuracy (avoid false positives from string matching)

Do NOT use for: simple string replacements, non-code files, languages not supported.

Supported languages

Java, Python, JavaScript, TypeScript, TSX, Rust, Go, Ruby, C, C++, C#, PHP, Bash

Commands

Command	Effect
find	Print file:line:col for each match
replace	Replace matched code with new code
delete	Remove matched code
insert-before	Insert code before each match
insert-after	Insert code after each match
nodes	List available tree-sitter node kinds for a language

Pattern syntax

Basic placeholders

• $name — matches any single AST node (identifier, literal, expression)
• $name:Kind — matches only nodes of specific tree-sitter kind (e.g., $x:identifier, $n:string_literal)

Special tokens

Token	Matches
$BODY	Zero or more statements inside a block
$STMT	A single statement of any kind
$EXPR	A single expression

Repetition syntax

• $($name)sep* — Rust-style repetition with separator awareness (zero or more)
• $($name)sep+ — one or more
• $($a, $b)sep* — multi-item repetition groups
• $$$name — position-independent catch-all (no separator tracking)

Examples

# Rename method across files
patchwork replace -i -p 'getOldData($a)' -r 'getData($a)' src/**/*.java

# Delete all debug calls
patchwork delete -i -p 'debug($msg)' src/*.py

# Find return statements
patchwork find -p 'return $val;' src/

# Match function calls with any number of args (separator-aware)
patchwork find -p '$f($($arg,)*);' src/

# Find all if statements
patchwork find -p 'if ($EXPR) { $BODY }' src/

# Replace with arg reordering
patchwork replace -i -p '$f($a, $b)' -r '$f($b, $a)' src/*.py

# Match only identifiers (not property access) on LHS
patchwork find -p '$x:identifier = $val;' src/

# List node kinds for type constraints
patchwork nodes java
patchwork nodes python --all  # include punctuation/operators

Flags

• -i, --in-place — modify files directly (like sed -i)
• -l, --language — force language detection
• -p, --pattern — code snippet pattern
• -q, --query — tree-sitter query (advanced)
• -r, --replacement — replacement code (for replace)
• --code — code to insert (for insert-before/insert-after)

Pipe mode

cat Main.java | patchwork find -l java -p 'return null;'

Limitations

• Single-file only — no cross-file rename tracking or import updates
• Replacement text isn't auto-indented
• $$$name doesn't match statements inside blocks (use $BODY)