Text apply unified patch

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

Apply a one-file unified patch to text at original line addresses with exact hunk matches.

Use when you need to: text apply unified patch · apply unified diff to text · apply a unified patch exactly.

Supported

• text apply unified patch
• apply unified diff to text
• apply a unified patch exactly

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) removing that many leading path components from ---/+++ names.
• text is split into line records; only CRLF, LF, and CR are terminators.
• Hunks apply against the original record array at the parsed 0-based old_start addresses. old ranges must be sorted and disjoint; empty ranges at the same index overlap and are rejected.
• Each hunk old side must equal the original slice; there is no search, fuzz, or offset.
• Parsed body records use eol LF, or empty when a no-newline marker follows that body line. Original CR/LF is not carried through unified text.
• identical is true iff the patch contains no hunks; an empty unified string is a no-op.
• Output text is joinRecords of the patched records and must fit the output byte budget.

Input

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

Output

• text (string, required): max length 1048576
• identical (boolean, required)

Limits

• max text bytes: 262144
• max line count: 4096
• max line bytes: 16384
• max hunks: 1024
• max path bytes: 1024
• max strip: 8
• max output bytes: 1048576

Example

Request input:

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

Response:

{
  "result": {
    "text": "a\nc\n",
    "identical": false
  }
}

How to call it

MCP

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

{
  "id": "text-apply-unified-patch",
  "version": "1.0.0",
  "input": {
    "text": "a\nb\n",
    "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-apply-unified-patch/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"text":"a\nb\n","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-apply-unified-patch/versions/1.0.0.

CLI

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

Get the client at /clients/cli/.

Related tools

• Text invert unified patch: Invert a one-file unified patch by swapping file names and delete/insert ops.
• 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 line endings normalize: Normalize all line endings in a text to a specific format (LF, CRLF, or CR).