Destructive changes using git diff

create-destructive-changes.sh

#!/bin/bash

write_xml () {
    local type_name="$1"
    shift
    local type_arry=("$@")
    XML="${XML}\n\t<types>\n\t\t<name>${type_name}</name>"
    for FILENAME in "${type_arry[@]}"; do
        XML="${XML}\n\t\t<members>${FILENAME}</members>"
    done
    XML="${XML}\n\t</types>"
}

TEMP_DIR=.temp
mkdir $TEMP_DIR &> /dev/null

CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`

if [ $# -ne 0 ]
then
  CURRENT_BRANCH=$1
fi

# detect deletions by tracking metadata files
DIFF_CMD="git diff -z --name-only --no-renames --diff-filter=D master..${CURRENT_BRANCH} -- 'force-app/**/*-meta.xml'"
echo detecting deletes using ${DIFF_CMD}
while read -r -d '' file; do
    if [[ ${file} != *-meta.xml ]]; then # ensure we are working with meta files
        continue
    fi

    # ignore files that exist in the deploy folder
    FILE_NAME=`expr "${file}" : ".*\/\(.*\)"`
    FILE_EXISTS=`find ${TEMP_DIR}/deploy -name "${FILE_NAME}"`
    if [[ "${FILE_EXISTS}" != "" ]]; then
        continue
    fi

    FILENAME_WO_EXTENSION=`expr "${FILE_NAME}" : "\([^\.]*\)"`
    ALL_FILES+=("${FILENAME_WO_EXTENSION}")
    if [[ ${file} =~ \/staticresources\/ ]]; then # StaticResource
        echo "  - deleting resource ${FILENAME_WO_EXTENSION}"
        STATIC_RESOURCES+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/aura\/ ]]; then # AuraDefinitionBundle
        echo "  - deleting aura ${FILENAME_WO_EXTENSION}"
        AURA_BUNDLES+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/lwc\/ ]]; then # LightningComponentBundle
        echo "  - deleting lwc ${FILENAME_WO_EXTENSION}"
        LWC_BUNDLES+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/classes\/ ]]; then # ApexClass
        echo "  - deleting class ${FILENAME_WO_EXTENSION}"
        APEX_CLASSES+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/pages\/ ]]; then # ApexPage
        echo "  - deleting page ${FILENAME_WO_EXTENSION}"
        APEX_PAGES+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/triggers\/ ]]; then # ApexTrigger
        echo "  - deleting trigger ${FILENAME_WO_EXTENSION}"
        APEX_TRIGGERS+=("${FILENAME_WO_EXTENSION}")
    elif [[ ${file} =~ \/components\/ ]]; then # ApexComponent
        echo "  - deleting component ${FILENAME_WO_EXTENSION}"
        APEX_COMPONENTS+=("${FILENAME_WO_EXTENSION}")
    fi
done < <(sh -c "${DIFF_CMD}")

if [[ "${#ALL_FILES[@]}" == "0" ]]; then
    echo "no deletions"
    echo ""
    exit 0
fi

# create xml
XML='<?xml version="1.0" encoding="UTF-8"?>\n<Package xmlns="http://soap.sforce.com/2006/04/metadata">'

if [[ "${#APEX_CLASSES[@]}" != "0" ]]; then
    write_xml 'ApexClass' "${APEX_CLASSES[@]}"
fi

if [[ "${#APEX_PAGES[@]}" != "0" ]]; then
    write_xml 'ApexPage' "${APEX_PAGES[@]}"
fi

if [[ "${#APEX_TRIGGERS[@]}" != "0" ]]; then
    write_xml 'ApexTrigger' "${APEX_TRIGGERS[@]}"
fi

if [[ "${#APEX_COMPONENTS[@]}" != "0" ]]; then
    write_xml 'ApexComponent' "${APEX_COMPONENTS[@]}"
fi

if [[ "${#STATIC_RESOURCES[@]}" != "0" ]]; then
    write_xml 'StaticResource' "${STATIC_RESOURCES[@]}"
fi

if [[ "${#AURA_BUNDLES[@]}" != "0" ]]; then
    write_xml 'AuraDefinitionBundle' "${AURA_BUNDLES[@]}"
fi

if [[ "${#LWC_BUNDLES[@]}" != "0" ]]; then
    write_xml 'LightningComponentBundle' "${LWC_BUNDLES[@]}"
fi

# close xml
XML="${XML}\n\t<version>49.0</version>\n</Package>"

mkdir $TEMP_DIR/deploy &> /dev/null
rm $TEMP_DIR/deploy/destructiveChangesPost.xml &> /dev/null

printf "${XML}" > $TEMP_DIR/deploy/destructiveChangesPost.xml
echo "destructiveChangesPost.xml written to ${TEMP_DIR}/deploy"
echo ""