#!/bin/bash

#
# nanodesk-menumaker - generate menu from .desktop files for jwm
#
# WORK IN PROGRESS
#
# DOES NOT WORK ATM

declare -A APPS_NAME
declare -A APPS_ICON
declare -A APPS_EXEC
declare -A CATEGORIES_APPS

# excluding 'Audio' and 'Video' because they are kind of redundant with 'AudioVideo'
FREEDESKTOP_CATEGORIES="AudioVideo Development Education Game Graphics Network Office Science Settings System Utility"

get_desktop_entry() {
  # only get [Desktop Entry] section
  # explanation https://stackoverflow.com/a/52957039
  sed -n '/\[Desktop Entry\]/,/.*:\[.*\]/ {//!p}' 
}

# Main freedesktop categories we iterate through later
# https://specifications.freedesktop.org/menu-spec/latest/apa.html

# put filename in front of its content with awk
# https://www.unix.com/302929136-post4.html?s=5d91d8bbc9c7a884772b0b84b3ca6c3f
# 
# dumping all files into a variable is much faster then grepping each file by file
# sed for remove path from filename: sed 's/^\/.*\/\(.*\.desktop:\)/\1/' 
# awk remove path from filename: https://stackoverflow.com/a/55149591
DESKTOPFILES="$(awk '{n=split(FILENAME,array,"/"); split(array[n],arraym,"."); print arraym[1]":" $0 }' /usr/share/applications/*.desktop $HOME/.local/share/applications/*.desktop  | get_desktop_entry |grep -E ':Name=|:Icon=|:Categories=|:NoDisplay=|:Exec=' )"

APPS_NODISPLAY="$(echo "$DESKTOPFILES" | grep "NoDisplay=true" | cut -d : -f1 | xargs | tr ' ' '|')"
APPS="$(echo "$DESKTOPFILES" | grep -vE "$APPS_NODISPLAY" | cut -d : -f1 | uniq)"

# put the apps into the freedesktop categories
for category in $FREEDESKTOP_CATEGORIES
do
#	echo === CATEGORY $category ===
	CATEGORIES_APPS[$category]="$(echo "$DESKTOPFILES" | grep -i $category | cut -d : -f1 | uniq | xargs)"
 #   echo ${CATEGORIES_APPS[$category]}

done


for appname in $APPS
do
	APPS_NAME[$appname]="$(echo "$DESKTOPFILES" | grep -E "^$appname.*Name=" | cut -d = -f2)"
	APPS_ICON[$appname]="$(echo "$DESKTOPFILES" | grep -E "^$appname.*Icon=" | cut -d = -f2)"
	APPS_EXEC[$appname]="$(echo "$DESKTOPFILES" | grep -E "^$appname.*Exec=" | cut -d = -f2)"
done
#
#echo "$APPS"
#echo ${!APPS_NAME[@]}
#echo ${APPS_NAME[xfce4-web-browser]}
#echo ${APPS_ICON[xfce4-web-browser]}
#echo ${APPS_EXEC[xfce4-web-browser]}
#echo ${APPS_CAT[xfce4-web-browser]}
#echo "$DESKTOPFILES"

# jwm config output

cat <<EOF
<?xml version="1.0"?>
<JWM>
EOF

for category in $FREEDESKTOP_CATEGORIES
do
#	test  "$category" == "AudioVideo" && category="Multimedia"
	#echo -e "appname: $appname \nName: ${APPS_NAME[$appname]}\nIcon: ${APPS_ICON[$appname]}\nExec: ${APPS_EXEC[$appname]}\nCategories: ${APPS_CAT[$appname]}\n---"
	test -n "${CATEGORIES_APPS[$category]}" && cat <<EOF
<Menu icon="applications-${category,,}" label="${category}">
EOF
	
	for app in ${CATEGORIES_APPS[$category]}
	do
	echo "  <Program icon=\""${APPS_ICON[$app]}"\" label=\""${APPS_NAME[$app]}"\">"${APPS_EXEC[$app]}"</Program>"
	done
	

	test -n "${CATEGORIES_APPS[$category]}" && echo "</Menu>"

done

echo "</JWM>"