added git_stats function to git plugin collection

plugins/git.plugins.bash

@@ -54,3 +54,42 @@ function git_info() {
     fi
 }
 
+function git_stats {
+# awesome work from https://github.com/esc/git-stats
+# including some modifications
+
+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' ')
+    LOGOPTS=""
+    if [ "$1" == '-w' ]; then
+        LOGOPTS="$LOGOPTS -w"
+        shift
+    fi
+    if [ "$1" == '-M' ]; then
+        LOGOPTS="$LOGOPTS -M"
+        shift
+    fi
+    if [ "$1" == '-C' ]; then
+        LOGOPTS="$LOGOPTS -C --find-copies-harder"
+        shift
+    fi
+    for a in $AUTHORS
+    do
+        echo '-------------------'
+        echo "Statistics for: $a"
+        echo -n "Number of files changed: "
+        git log $LOGOPTS --all --numstat --format="%n" --author=$a | cut -f3 | sort -iu | wc -l
+        echo -n "Number of lines added: "
+        git log $LOGOPTS --all --numstat --format="%n" --author=$a | cut -f1 | awk '{s+=$1} END {print s}'
+        echo -n "Number of lines deleted: "
+        git log $LOGOPTS --all --numstat --format="%n" --author=$a | cut -f2 | awk '{s+=$1} END {print s}'
+        echo -n "Number of merges: "
+        git log $LOGOPTS --all --merges --author=$a | grep -c '^commit'
+    done
+else
+    echo "you're currently not in a git repository"
+fi
+}
+