This is a very simple tool for assisting observe the diff result.

How to use

1. This tool would look at projects inside the observed_projects folder. And show all projects' diff for the newest 50 commits. The project need to exist .gitattribute, which contain *.js diff=javascript like setting.

2. Modidy gitBinPath variable in main.py into your git binary path.

3. After executing main.py, the diff_result directory will contain _content.txt and _result.diff. Ex: has jquery_content.txt, below is one diff's result in jquery_content.txt

   diff --git a/a.js b/b.js
   @@ -22,7 +22,6 @@ module.exports = function( grunt ) {
   A blob:687b3215c92928c5ca3714822497b490d264af9f
   "use strict";
   
   module.exports = function( grunt ) {
       function readOptionalJSON( filepath ) {
           var stripJSONComments = require( "strip-json-comments" ),
               data = {};
           try {
               data = JSON.parse( stripJSONComments(
                   fs.readFileSync( filepath, { encoding: "utf8" } )
               ) );
           } catch ( e ) {}
           return data;
       }
   
       // Support: Node.js <12
       // Skip running tasks that dropped support for Node.js 10
       // in this Node version.
       function runIfNewNode( task ) {
           return oldNode ? "print_old_node_message:" + task : task;
       }
   
       var fs = require( "fs" ),
           gzip = require( "gzip-js" ),
           oldNode = /^v10\./.test( process.version ),
           nodeV17OrNewer = !/^v1[0246]\./.test( process.version ),
           isCi = process.env.GITHUB_ACTION,
           ciBrowsers = process.env.BROWSERS && process.env.BROWSERS.split( "," );
   
       if ( !grunt.option( "filename" ) ) {
   

   has jquery_result.diff, below is one diff's result in jquery_result.diff

   diff --git a/a.js b/b.js
   index 687b3215..7514c9a7 100644
   --- a/a.js
   +++ b/b.js
   @@ -22,7 +22,6 @@ module.exports = function( grunt ) {
       var fs = require( "fs" ),
           gzip = require( "gzip-js" ),
           oldNode = /^v10\./.test( process.version ),
   -		nodeV17OrNewer = !/^v1[0246]\./.test( process.version ),
           isCi = process.env.GITHUB_ACTION,
           ciBrowsers = process.env.BROWSERS && process.env.BROWSERS.split( "," );

   We can observe the diff change in jquery_result.diff, and the jquery_content.txt can show more content, including the code reaching the hunk header and a few lines above the hunk header. So we can judge whether the hunk header is suitable or not.