From a49eaa7f533bb7c3338d7864e3d118d43ede861e Mon Sep 17 00:00:00 2001
From: Christophe Porteneuve <tdd@tddsworld.com>
Date: Fri, 8 Nov 2013 19:31:19 +0100
Subject: Fix step 3: code cleanup + faster/nimbler use of Git to obtain data
 (rev-parse and cat-file instead of multiple log calls)

---
 lib/fetchGitData.js | 78 +++++++++++++++++++----------------------------------
 1 file changed, 28 insertions(+), 50 deletions(-)

(limited to 'lib/fetchGitData.js')

diff --git a/lib/fetchGitData.js b/lib/fetchGitData.js
index f75ca82..1633bd5 100644
--- a/lib/fetchGitData.js
+++ b/lib/fetchGitData.js
@@ -1,37 +1,19 @@
 var exec = require('child_process').exec;
 var logger = require('./logger')();
 
-var fetchGitData = function(git, cb) {
+function fetchGitData(git, cb) {
   if (!cb){
     throw new Error("fetchGitData requires a callback");
   }
 
-  var i;
-  var execGit = true;
-  var head = {
-    "author_name": {
-      "format": "'%aN'",
-    },
-    "author_email": {
-      "format": "'%ae'",
-    },
-    "committer_name": {
-      "format": "'%cN'",
-    },
-    "committer_email": {
-      "format": "'%ce'",
-    },
-    "message": {
-      "format": "'%s'",
-    }
-  };
-
   //-- Malformed/undefined git object
   if ('undefined' === typeof git) {
     return cb(new Error('No options passed'));
-  } else if (!git.hasOwnProperty('head')) {
+  }
+  if (!git.hasOwnProperty('head')) {
     return cb(new Error('You must provide the head'));
-  } else if (!git.head.hasOwnProperty('id')) {
+  }
+  if (!git.head.hasOwnProperty('id')) {
     return cb(new Error('You must provide the head.id'));
   }
 
@@ -52,7 +34,7 @@ var fetchGitData = function(git, cb) {
   }
 
   //-- Use git?
-  exec("git log -1 " + git.head.id + " --pretty=format:'%H'", function(err, response){
+  exec("git rev-parse --verify " + git.head.id, function(err, response){
     if (err){
       // git is not available...
       git.head.author_name = git.head.author_name || "Unknown Author";
@@ -63,32 +45,7 @@ var fetchGitData = function(git, cb) {
       return cb(null, git);
     }
 
-    //-- Head
-    var commands = [];
-    var fields = [];
-    for (var field in head) {
-      fields.push(field);
-      var command = "git log -1 " + git.head.id + " --pretty=format:" + head[field].format;
-      commands.push(command);
-    }
-    var i = 0;
-    var remaining = commands.length;
-    commands.forEach(function(command){
-      var field = fields[i];
-      i++;
-      exec(command, function(err, response){
-        if (err) return cb(err);
-        git.head[field] = response;
-        remaining--;
-        if (remaining === 0){
-          if (git.branch) {
-            fetchRemotes(git, cb);
-          } else {
-            fetchBranch(git, cb);
-          }
-        }
-      });
-    });
+    fetchHeadDetails(git, cb);
   });
 }
 
@@ -102,6 +59,27 @@ function fetchBranch(git, cb) {
   });
 }
 
+var REGEX_COMMIT_DETAILS = /\nauthor (.+?) <(.+?)>.+\ncommitter (.+?) <(.+?)>.+\n\n(.*)/m;
+
+function fetchHeadDetails(git, cb) {
+  exec('git cat-file -p ' + git.head.id, function(err, response) {
+    if (err)
+      return cb(err);
+
+    var items = response.match(REGEX_COMMIT_DETAILS).slice(1);
+    var fields = ['author_name', 'author_email', 'committer_name', 'committer_email', 'message'];
+    fields.forEach(function(field, index) {
+      git.head[field] = items[index];
+    });
+
+    if (git.branch) {
+      fetchRemotes(git, cb);
+    } else {
+      fetchBranch(git, cb);
+    }
+  });
+}
+
 function fetchRemotes(git, cb) {
   exec("git remote -v", function(err, remotes){
     if (err)
-- 
cgit v1.2.3