List all applications on XDG

desktop-file-list

#!/bin/bash

parse_desktop_file() {
    local file="$1"
    local section=""
    local mainexec=""
    local mainname=""
    
    while IFS= read -r line || [[ -n "$line" ]]; do
        [[ "$line" =~ ^[\;\#] || -z "$line" ]] && continue
        
        if [[ "$line" =~ ^\[(.+)\]$ ]]; then
            section="${BASH_REMATCH[1]}"
            continue
        fi
        
        if [[ "$section" == "Desktop Entry" && "$line" =~ ^([^=]+)=(.*)$ ]]; then
            key="${BASH_REMATCH[1]}"
            value="${BASH_REMATCH[2]}"
            
            [[ "$key" == "Name" ]] && mainname="$value"
            
            if [[ "$key" == "Exec" ]]; then
                mainexec="${value%% *}"
                if [[ "$mainexec" == "env" || "$mainexec" == "/usr/bin/env" ]]; then
                    mainexec=$(echo "$value" | grep -oP '(^|[\s=])/?\w[\w/.-]+' | grep -v '=' | head -1 | xargs)
                fi
            fi
        fi
    done < "$file"
    
    jq -c -n --arg f "$file" --arg n "$mainname" --arg e "$mainexec" '{file: $f, name: $n, exec: $e}'
    # printf '%s\t%s\t%s\n' "$mainname" "$mainexec" "$file"
}

: "${XDG_DATA_HOME:=$HOME/.local/share}"
: "${XDG_DATA_DIRS:=/usr/local/share:/usr/share}"

IFS=':' read -r -a data_dirs <<< "$XDG_DATA_HOME:$XDG_DATA_DIRS"

shopt -s nullglob

for dir in "${data_dirs[@]}"; do
    app_dir="${dir%/}/applications"
    [[ -d "$app_dir" ]] || continue
    
    for desktop_file in "$app_dir"/*.desktop; do
        parse_desktop_file "$desktop_file"
    done
done

shopt -u nullglob