Apply patches or change sets from core.trac.wordpress.org tickets.

## apply-trac-patch.sh
#!/usr/bin/env bash

# ====================================================================================
# Script to install patches or changesets to https://core.trac.wordpress.org
# I use with Local Lightning by Flywheel by installing in `/app` directory.
#
# Patches and changesets are saved in `/tmp/` as a default.
# You will use the patch URL in the script.
# ====================================================================================

# ====================================================================================
# Instructions
#
# 1 - Right click your site in the Local Lightning App and click Open Site Shell.
#
# 2 - Download this file (apply-trac-patch.sh) inside your site's /app folder
#    curl -o apply-trac-patch.sh https://gist.githubusercontent.com/afragen/977d765414189d5f5fae42215fe92a27/raw/apply-trac-patch.sh
#
# 3 - Run the script from the /app/public folder
#    bash ../apply-trac-patch.sh
#
# If your installation is based upon develop.git.wordpress.org
# at this time it is recommended to use the 'npm run grunt patch:####'
#    https://make.wordpress.org/core/handbook/testing/patch/#using-grunt
#
# ticket - is the filename of a patch attached to a Trac ticket.
#
# changeset - is a committed changeset number
# ====================================================================================

echo "Assumes a WordPress installation based on core.git.wordpress.org"
echo "If WordPress installation based on develop.git.wordpress.org"
echo "    use 'npm run grunt patch:#####'"
echo

PATCH_TYPE="ticket"
printf "Does the patch come from a Trac ticket or a Changeset (TICKET|changeset)? "
read -e input
input=$(echo "$input" | tr '[:upper:]' '[:lower:]')
#input="${input%/}" # Strip trailing slash
PATCH_TYPE="${input:-$PATCH_TYPE}"

DEFAULT_SAVED_DIR="/tmp"
mkdir -p "$DEFAULT_SAVED_DIR/"
echo "Where do we save the patch?"
printf "($DEFAULT_SAVED_DIR): "
read -e input
input="${input%/}"                               # Strip trailing slash
DEFAULT_SAVED_DIR="${input:-$DEFAULT_SAVED_DIR}" # Populate with default if empty

if [[ $PATCH_TYPE == 'ticket' ]]; then
    PATCH_DEPTH="1"
    printf "Trac patch URL: "
    read -e PATCH_URL
    PATCH_URL=$(echo "$PATCH_URL" | tr -d '[[:space:]]')
    TRAC_TICKET=$(echo "$PATCH_URL" | awk -F "/" '{print $6}')
    PATCH=$(echo "$PATCH_URL" | awk -F "/" '{print $7}')

    DEFAULT_PATCH_PATH="$DEFAULT_SAVED_DIR/patch_$PATCH"
    echo "Download and modify patch from Trac ticket: $TRAC_TICKET"
    URL="https://core.trac.wordpress.org/raw-attachment/ticket/$TRAC_TICKET/$PATCH"
fi

if [[ $PATCH_TYPE == 'changeset' ]]; then
    PATCH_DEPTH="3"
    printf "Changeset number from trunk: "
    read -e CHANGESET

    DEFAULT_PATCH_PATH="$DEFAULT_SAVED_DIR/changeset_$CHANGESET.diff"
    echo "Download and modify patch from changeset: $CHANGESET"
    URL="https://core.trac.wordpress.org/changeset/$CHANGESET?format=diff&new=$CHANGESET"
fi

echo
echo "Downloading: $URL"
echo
curl "$URL" | sed 's/Index: \(.*\)*$/git --diff \1/' | sed -e 's#/src##g' >"$DEFAULT_PATCH_PATH"

echo
echo "Patch filepath: $DEFAULT_PATCH_PATH"
echo

printf "Apply patch? (Y|n)? "
read -e input
PROCEED="${input:-y}"

# Allow user cancellation.
if [ $(echo "$PROCEED" | tr '[:upper:]' '[:lower:]') != "y" ]; then
    echo "Aborting..."
    exit 1
fi

#echo "Patch depth: -p$PATCH_DEPTH"
patch --verbose "-p$PATCH_DEPTH" <"$DEFAULT_PATCH_PATH"
echo