added plugin to create git changelog and formatted code

plugins/available/git.plugin.bash

@@ -160,10 +160,10 @@ function git_stats {
     about 'display stats per author'
     group 'git'
     
-# awesome work from https://github.com/esc/git-stats
-# including some modifications
+    # awesome work from https://github.com/esc/git-stats
+    # including some modifications
     
-if [ -n "$(git symbolic-ref HEAD 2> /dev/null)" ]; then
+    if [ -n "$(git symbolic-ref HEAD 2> /dev/null)" ]; then
         echo "Number of commits per author:"
         git --no-pager shortlog -sn --all
         AUTHORS=$( git shortlog -sn --all | cut -f2 | cut -f1 -d' ')
@@ -193,9 +193,9 @@ if [ -n "$(git symbolic-ref HEAD 2> /dev/null)" ]; then
             echo -n "Number of merges: "
             git log $LOGOPTS --all --merges --author=$a | grep -c '^commit'
         done
-else
+    else
         echo "you're currently not in a git repository"
-fi
+    fi
 }
 
 function gittowork() {
@@ -273,3 +273,38 @@ function gitignore-reload() {
         echo >&2 "Files readded. Commit your new changes now."
     fi
 }
+
+function git-changelog(){
+    about 'Creates the git changelog from one point to another by date'
+    group 'git'
+    example '$ git-changelog origin/master...origin/release [md|txt]'
+    
+    if [[ "$1" != *"..."* ]]
+    then
+        echo "Please include the valid 'diff' to make changelog"
+        return 1
+    fi
+    
+    local NEXT=$(date +%F)
+    
+    if [[ "$2" == "md" ]]
+    then
+        echo "# CHANGELOG $1"
+        
+        git log $1 --no-merges --format="%cd" --date=short | sort -u -r | while read DATE ; do
+            echo
+            echo "### $DATE"
+            GIT_PAGER=cat git log --no-merges --format=" * (%h) %s by [%an](mailto:%ae)" --since="$DATE 00:00:00" --until="$DATE 24:00:00"
+            NEXT=$DATE
+        done
+    else
+        echo "CHANGELOG $1"
+        echo ----------------------
+        git log $1 --no-merges --format="%cd" --date=short | sort -u -r | while read DATE ; do
+            echo
+            echo [$DATE]
+            GIT_PAGER=cat git log --no-merges --format=" * (%h) %s by %an <%ae>" --since="$DATE 00:00:00" --until="$DATE 24:00:00"
+            NEXT=$DATE
+        done
+    fi
+}