handle-github-org-transfer.sh

#!/bin/bash

main() {
  CURRENT_ORG=$1
  NEW_ORG=$2
  STARTING_DIR=$(pwd)

  # bomb out if not given current and new org names
  [ -z $CURRENT_ORG ] || [ -z $NEW_ORG ] && missing_arguments

  announce
  process_repos
}

missing_arguments() {
  echo Missing required argument
  echo
  usage
}

# Print usage instructions and exit
usage() {
  echo rename-git-origin.sh CURRENT_ORG NEW_ORG
  echo
  echo Useful when moving your repositories to a new GitHub organization.
  echo
  echo ex: renamte-git-origin tstmedia sportngin
  exit 1
}

announce() {
  echo Renaming the org in all repos in the $STARTING_DIR from $CURRENT_ORG to $NEW_ORG
  echo
}

process_repos() {
  echo Finding Git...
  echo
  for repo in $(repos_in_directory); do
    rename_org_for $repo
    echo
  done
}

# Find all the .git directories within the current directory
repos_in_directory() {
  find $STARTING_DIR -type d -name .git
}

# Rename the organization of the given repo
#
# repo_path - Path to a Git repository
rename_org_for() {
  repo_path=$1
  echo Reviewing $repo_path
  origin=$(current_origin $repo_path)
  echo Currently pointing at $origin

  if [[ $origin == *$CURRENT_ORG* ]]; then
    new_origin=$(search_and_replace $origin $CURRENT_ORG $NEW_ORG)
    echo Renaming to $new_origin
    perform_rename $repo_path $new_origin
  else
    echo "Skipping, since it doesn't currently point to $CURRENT_ORG"
  fi
}

# Return the current URL the Git repo has configured as origin
#
# repo_path - Path to a Git repository
current_origin() {
  cd $repo_path
  # find 'origin URL (fetch)' just get the URL out
  git remote -v | grep origin | grep fetch | awk '{ print $2 }'
  cd $STARTING_DIR
}

# Search and replace in the given string
#
# string - String to perform the search and replace against
# search_value - What to search for in the string
# replace_value - What to replace with
search_and_replace() {
  string=$1
  search_value=$2
  replace_value=$3
  echo ${string/$search_value/$replace_value}
}

# Actually perform the rename of the given repo to the given origin
#
# repo_path - Path to a Git repository
# new_origin - The URL to set origin to use
perform_rename() {
  repo_path=$1
  new_origin=$2

  cd $repo_path
  git remote set-url origin $new_origin
  cd $STARTING_DIR
}

main $*