GitDiff

A simple haskell tool to parse the output of git diff command to JSON format.

Usage

1. Install haskell tool stack using ghcup.
2. Either run directly via stack run or install it via stack install as GitDiff-exe.
3. Pipe the output via this tool git diff | GitDiff-exe.

Example

Consider the following output from git diff:

diff --git a/file1.txt b/file1.txt
index 168ed52..e41a4f5 100644
--- a/file1.txt
+++ b/file1.txt
@@ -1,6 +1,6 @@
 This is a sample file.
-This line is changed.
+These lines are part of the original content.
 Add a new line here.
 Another change in content.
-Additional lines in the middle.
+More lines in the original file.
 New content at the end of the file.

When run this output via GitDiff-exe we see the following JSON:

[
  {
    "chunks": [
      {
        "fromLineRange": {
          "from": 1,
          "length": 6
        },
        "lineDiffs": [
          {
            "ContextLine": "This is a sample file."
          },
          {
            "RemovedLine": "This line is changed."
          },
          {
            "AddedLine": "These lines are part of the original content."
          },
          {
            "ContextLine": "Add a new line here."
          },
          {
            "ContextLine": "Another change in content."
          },
          {
            "RemovedLine": "Additional lines in the middle."
          },
          {
            "AddedLine": "More lines in the original file."
          },
          {
            "ContextLine": "New content at the end of the file."
          }
        ],
        "toLineRange": {
          "from": 1,
          "length": 6
        }
      }
    ],
    "fromFile": "file1.txt",
    "headers": [
      "index 168ed52..e41a4f5 100644"
    ],
    "toFile": "file1.txt"
  }
]

Limitations

1. This code does not handle many git diff output variations.
2. The header section is not parsed, rather just kept as a list ot strings.
3. It can not handle diff between more than 2 files.