mesonic

#!/bin/bash
#
# mesonic - Helper script for meson projects
#
# Description: 
#	  This script automates the build, run, and install process for meson-based projects.
#   It also provides a watch mode that rebuilds the project on file changes.
# Author: ahme.dev
# Usage: 
#   - Watch and rebuild with `./mesonic`
#		- Build once with `./mesonic build`
#		- Build and run once with `./mesonic run`
#		- Install with `./mesonic install`
#

resetColor='\033[0m'
redColor='\033[1;31m'
greenColor='\033[1;32m'
if [ ! -t 1 ]; then
	redColor=''
	greenColor=''
fi

command -v meson >/dev/null 2>&1 || { echo -e >&2 "${redColor}==> Error: meson is not installed.${resetColor}"; exit 1; }
command -v inotifywait >/dev/null 2>&1 || { echo -e >&2 "${redColor}==> Error: inotifywait is not installed.${resetColor}"; exit 1; }

PROJECT_NAME=$(awk '/^[[:space:]]*project[[:space:]]*\(/{found=1; next} found && /^[[:space:]]*'"'"'[^'"'"']*'"'"'/{match($0, /'"'"'([^'"'"']*)'"'"'/, arr); print arr[1]; exit}' meson.build)
if [ -z "$PROJECT_NAME" ]; then
	echo -e "${redColor}==> Error: Could not determine project name from meson.build${resetColor}"
	exit 1
else
	echo -e "${greenColor}==> Project name: $PROJECT_NAME${resetColor}"
fi

WATCH_DIR="src"  
BUILD_DIR="build"
EXECUTABLE="$BUILD_DIR/$PROJECT_NAME"
DEBOUNCE=1

build() {
  echo -e "${greenColor}==> Building${resetColor}"

	if [ ! -d "$BUILD_DIR" ]; then
		echo -e "==> Setting build dir for the first time"
		meson setup "$BUILD_DIR"
	fi

  meson compile -C "$BUILD_DIR"
}

run() {
  if [ $? -eq 0 ]; then
    echo -e "${greenColor}==> Running${resetColor}"
    "$EXECUTABLE"
  else
    echo -e "${redColor}==> Build failed${resetColor}"
  fi
}

install() {
	echo -e "${greenColor}==> Installing${resetColor}"
	meson install -C "$BUILD_DIR"
}

test () {
	./$BUILD_DIR/runtests
}

# initial build and run, or install if requested

build
if [ "$1" == "build" ]; then
  exit 0
fi

if [ "$1" == "install" ]; then
	install
	exit 0
fi

if [ "$1" == "test" ]; then
	test
	exit 0
fi

run
if [ "$1" == "run" ]; then
	exit 0
fi

# watch for changes and rebuild/run

while true; do
	inotifywait -q -e modify,create,delete -r --exclude '(\.swp$|~$)' "$WATCH_DIR"
  sleep $DEBOUNCE
	build
	run
done