Text diff stats

text-diff-stats · version 1.0.0 · Text · free, no key needed

Summarize a line-record diff as keep, insert, delete, and hunk counts.

Use when you need to: text diff stats · count line diff insertions and deletions · summarize text line differences.

Supported

• text diff stats
• count line diff insertions and deletions
• summarize text line differences

Not supported

• character-level stats
• fuzzy matching
• patience/histogram diff
• binary patches
• git diff --git headers
• filesystem access

Behavior

• left and right are split with splitRecords. Record equality is text plus eol.
• Counts come from the Myers line-record SES: keeps, insertions, and deletions are op-kind totals.
• hunks is the integer hunk count from hunksFromSes, not the hunk list. context defaults to 3, may be 0, and is at most 16.
• identical is true iff there are no change ops. lines_left and lines_right are record counts.
• A single isolated replacement is one hunk for any context 0..16. Far-apart changes may merge when context is large enough.
• Unknown input fields are rejected.

Input

• left (string, required): max length 262144
• right (string, required): max length 262144
• context (integer, optional): min 0; max 16

Output

• lines_left (integer, required): min 0
• lines_right (integer, required): min 0
• keeps (integer, required): min 0
• insertions (integer, required): min 0
• deletions (integer, required): min 0
• hunks (integer, required): min 0
• identical (boolean, required)

Limits

• max text bytes: 262144
• max line count: 4096
• max line bytes: 16384
• max context: 16
• max hunks: 1024
• max output bytes: 1048576

Example

Request input:

{
  "left": "a\nb\n",
  "right": "a\nc\n"
}

Response:

{
  "result": {
    "lines_left": 2,
    "lines_right": 2,
    "keeps": 1,
    "insertions": 1,
    "deletions": 1,
    "hunks": 1,
    "identical": false
  }
}

How to call it

MCP

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

{
  "id": "text-diff-stats",
  "version": "1.0.0",
  "input": {
    "left": "a\nb\n",
    "right": "a\nc\n"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/text-diff-stats/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"left":"a\nb\n","right":"a\nc\n"}'

The machine-readable contract is at /v1/tools/text-diff-stats/versions/1.0.0.

CLI

node cli.mjs run text-diff-stats 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Text line diff: Diff two texts as line records, preserving each line terminator.
• Text lines count: Count exact line multiplicities in first-seen order.
• Text parse unified patch: Parse a one-file unified patch into path names and 0-based hunks.
• Text apply unified patch: Apply a one-file unified patch to text at original line addresses with exact hunk matches.
• Text count: Count Unicode code points, UTF-16 code units, UTF-8 bytes, and lines.
• Text extract between: Extract exact substrings between start and end markers, left to right and non-overlapping.