Text invert unified patch

text-invert-unified-patch · version 1.0.0 · Text · free, no key needed

Invert a one-file unified patch by swapping file names and delete/insert ops.

Use when you need to: text invert unified patch · reverse a unified diff · invert unified patch hunks.

Supported

• text invert unified patch
• reverse a unified diff
• invert unified patch hunks

Not supported

• offset or fuzz patch apply
• preserve original CR/LF through unified text
• git diff --git headers
• binary patches
• fuzzy matching
• filesystem access

Behavior

• unified is one-file unified diff text; strip is an integer 0..8 (default 0) applied to ---/+++ paths before names are swapped.
• An empty patch (no hunks) inverts to an empty unified string.
• Inversion swaps from_name with to_name, swaps old_* with new_* on each hunk, maps delete to insert and insert to delete, and leaves keep ops unchanged.
• Emitted unified always writes both hunk counts with a comma and a newline after every line including the last.
• No-newline markers follow inverted body lines whose record eol is empty.
• Git multi-file headers, binary markers, and original CR/LF through unified body text are not supported.

Input

• unified (string, required): max length 262144
• strip (integer, optional): min 0; max 8

Output

• unified (string, required): max length 1048576

Limits

• max text bytes: 262144
• max hunks: 1024
• max path bytes: 1024
• max strip: 8
• max output bytes: 1048576

Example

Request input:

{
  "unified": "--- a\n+++ b\n@@ -1,2 +1,2 @@\n a\n-b\n+c\n"
}

Response:

{
  "result": {
    "unified": "--- b\n+++ a\n@@ -1,2 +1,2 @@\n a\n+b\n-c\n"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "text-invert-unified-patch",
  "version": "1.0.0",
  "input": {
    "unified": "--- a\n+++ b\n@@ -1,2 +1,2 @@\n a\n-b\n+c\n"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/text-invert-unified-patch/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"unified":"--- a\n+++ b\n@@ -1,2 +1,2 @@\n a\n-b\n+c\n"}'

The machine-readable contract is at /v1/tools/text-invert-unified-patch/versions/1.0.0.

CLI

node cli.mjs run text-invert-unified-patch 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Text apply unified patch: Apply a one-file unified patch to text at original line addresses with exact hunk matches.
• Text parse unified patch: Parse a one-file unified patch into path names and 0-based hunks.
• Text unified diff: Emit a one-file unified diff of two texts with comma counts and LF document breaks.
• Text diff stats: Summarize a line-record diff as keep, insert, delete, and hunk counts.
• Text line diff: Diff two texts as line records, preserving each line terminator.
• Text word diff: Diff two texts as whitespace versus non-whitespace word tokens.