Simple AndroidX Migration Script

script.sh

#!/usr/bin/env bash
# Original by Dan Lew
#
# I've found that the "Migrate to AndroidX" converter in Android Studio doesn't work very
# well, so I wrote my own script to do the simple job of converting package names.
#
# You can download a CSV of package names here: https://developer.android.com/topic/libraries/support-library/downloads/androidx-class-mapping.csv
#
# It'll run faster on a clean build because then there are fewer files to scan over.
#
# Uses `gsed` because I'm on a Mac. Can easily replace with `sed` if you don't have `gsed`.
# 
# This isn't perfect; it won't find every conversion issue. You break it you buy it. Viewer discretion is advised.
#
# Changes by Logan Johnson:
#  - replaced find with rg, which finds matching files much, much faster
#  - replaced sed with perl, which does the replacement much, much faster
# Original ran for 28 minutes on my laptop before I killed it. This version completes in just over a minute.
# As Dan said: not perfect, won't find every issue, good luck.

MAPPING_FILE=androidx-class-mapping.csv
PROJECT_DIR=../register

from_pkgs=""
replace=""
while IFS=, read -r from_pkg to_pkg
do
    from_pkgs+=" -e $from_pkg"
    replace+="; s/$from_pkg/$to_pkg/g"
done <<< "$(tail -n +2 $MAPPING_FILE)"

rg --files-with-matches -t java -t kotlin -t xml -F $from_pkgs $PROJECT_DIR | xargs perl -pi -e "$replace"