Added an alias for 'git add -p'

lib/git/status_shortcuts.sh

@@ -89,6 +89,33 @@ git_silent_add_shortcuts() {
   fi
 }
 
+# 'git add -p' wrapper
+# This shortcut means 'stage my selection of patchs for the file'
+# Should be used in conjunction with the git_status_shortcuts() function for 'git status'.
+# -------------------------------------------------------------------------------
+git_add_patch_shortcuts() {
+  if [ -z "$1" ]; then
+    echo "Usage: gap <file>  => git add -p <file>"
+    echo "       gap 1       => git add -p \$e1"
+    echo "       gap 2..4    => git add -p \$e2 \$e3 \$e4"
+    echo "       gap 2 5..7  => git add -p \$e2 \$e5 \$e6 \$e7"
+  else
+    git_silent_add_patch_shortcuts "$@"
+    # Makes sense to run 'git status' after this command.
+    git_status_shortcuts
+  fi
+}
+# Does nothing if no args are given.
+git_silent_add_patch_shortcuts() {
+  if [ -n "$1" ]; then
+    # Expand args and process resulting set of files.
+    for file in $(git_expand_args "$@"); do
+      git add -p $file
+      echo -e "# add '$file'"
+    done
+    echo "#"
+  fi
+}
 
 # Prints a list of all files affected by a given SHA1,
 # and exports numbered environment variables for each file.