✨ (flatpak-sync) Improve logging output

Closes #2

flatpak-sync/flatpak-sync.sh

@@ -9,13 +9,35 @@ set -euo pipefail
 
 APPS_LIST_PATH="${APPS_LIST_PATH:=$HOME/.config/flatpak-sync/apps.list}"
 
+APP_NAME="flatpak-sync"
+APP_COLOR="\033[0;35m"
+INFO_COLOR="\033[0;32m"
+ERR_COLOR="\033[1;31m"
+NO_COLOR="\033[0m"
+
+info() {
+    printf "$APP_COLOR[$APP_NAME] $INFO_COLOR$1$NO_COLOR\n"
+}
+
+error() {
+    printf "$APP_COLOR[$APP_NAME] $ERR_COLOR$1$NO_COLOR\n"
+}
+
+usage() {
+    info "Usage:"
+    info " -l  Path to the file keeping the date of the last check."
+    info " -r  Path to the directory containing all org-roam files."
+    info " -b  Path to the hugo base directory."
+    info " -s  Path of the Emacs lisp script for exporting the org-roam files."
+}
+
 function sync() {
     readarray -t requested_apps < <(cat "$APPS_LIST_PATH")
     readarray -t installed_apps < <(flatpak list --app --columns app | tail -n +1)
 
     declare -a requested_apps_cleaned=()
 
-    echo "Checking for apps to install."
+    info "Checking for apps to install."
     for app in "${requested_apps[@]}"; do
         if [[ -z "$app" ]] || [[ "$app" =~ ^#.* ]]; then
             continue
@@ -23,16 +45,16 @@ function sync() {
         requested_apps_cleaned+=("$app")
         # shellcheck disable=SC2076
         if [[ ! "${installed_apps[*]}" =~ "${app}" ]]; then
-            echo "$app not installed. Installing it."
+            info "$app not installed. Installing it."
             flatpak install -y "$app"
         fi
     done
 
-    echo "Checking for apps to remove."
+    info "Checking for apps to remove."
     for app in "${installed_apps[@]}"; do
         # shellcheck disable=SC2076
         if [[ ! "${requested_apps_cleaned[*]}" =~ "${app}" ]]; then
-            echo "$app no found in apps list. Removing it.";
+            info "$app no found in apps list. Removing it.";
             flatpak uninstall -y "$app"
         fi
     done
@@ -42,20 +64,25 @@ function add() {
     local appId="${2:-}"
 
     if [[ -z "$appId" ]]; then
-        echo "No application ID given."
+        error "No application ID given."
+        usage
         exit 1
     fi
 
     if grep -q "# $appId" "$APPS_LIST_PATH"; then
-        echo "App already in apps list but commented out. Manual fix of the app list file necessary."
+        error "App $appId already in apps list but commented out."
+        error "Manual fix of the app list file necessary."
         exit 2
     fi
 
     if grep -q "$appId" "$APPS_LIST_PATH"; then
-        echo "App already in apps list. Run with sync command to install."
+        error "App $appId already in apps list."
+        error "Run sync command to install it."
+        usage
         exit 3
     fi
 
+    info "Adding app $appId to apps list and installing it."
     local appsListFile
     appsListFile="$(realpath "$APPS_LIST_PATH")"
     echo "$appId" >> "$appsListFile"
@@ -65,20 +92,24 @@ function remove() {
     local appId="${2:-}"
 
     if [[ -z "$appId" ]]; then
-        echo "No application ID given."
+        error "No application ID given."
+        usage
         exit 1
     fi
 
     if grep -q "# $appId" "$APPS_LIST_PATH"; then
-        echo "App already in apps list but commented out. No remove possible."
+        error "App $appId already in apps list but commented out."
+        error "No remove possible."
         exit 2
     fi
 
     if ! grep -q "$appId" "$APPS_LIST_PATH"; then
-        echo "App not in apps list."
+        error "App $appId not in apps list."
+        usage
         exit 2
     fi
 
+    info "Removing app $appId from apps list and uninstalling it."
     local appsListFile
     appsListFile="$(realpath "$APPS_LIST_PATH")"
     appsListTmpFile="$(mktemp)"