Dynamically identify updated Xcode workspace projects with git diff

project_changes.sh

#!/bin/bash

# Parameters
workspace_path=$1                               # Path to .xcworkspace to identify projects

# Parameter check
if [[ $# != 1 ]]; then
  echo "usage: $0 <.xcworkspace path>"
  exit 1
fi

# Parse project paths from workspace
project_paths=`cat ${workspace_path}/contents.xcworkspacedata | egrep .xcodeproj | sed -e 's|      location = \"group:||' -e 's|/[^/]*$|/|' | tr '\n' '|' | sed 's/.$//'`
branch=`git rev-parse --abbrev-ref HEAD`        # Current branch
ancestor=`git merge-base $branch origin/master` # Least common ancestor from origin/master
diff_paths=`git diff --name-only $ancestor      # Get all file changes from ancestor

# Iterate through project paths with changes
while read project_path; do
  project_name=`basename $project_path`         # Project name
  echo "Changes found in project '$project_name'"
done< <(echo $diff_paths | egrep -o $project_paths | uniq)