Don't use git-tracked files as config files directly, and add the generated m3u to the gitignore properly

.gitignore

@@ -1,2 +1,5 @@
-.m3u
+*.m3u
 node_modules
+config/categories.json
+config/countries.json
+config/languages.json

iptv-m3u-update

@@ -3,6 +3,9 @@
 # Dependencies
 deps=('curl' 'dos2unix' 'grep' 'node' 'rows' 'sqlite3')
 
+# Config files
+config_files=('categories.json' 'countries.json' 'languages.json')
+
 # URLs
 tmp_m3u_url='https://iptv-org.github.io/iptv/index.m3u'
 tmp_csv_url='https://raw.githubusercontent.com/iptv-org/database/master/data/channels.csv'
@@ -92,5 +95,13 @@ done
     exit 1
 }
 
+# Ensure the required config files exist
+for config in "${config_files[@]}"; do
+    if [[ ! -f "config/$config" ]]; then
+        printf '%s\n' "The file config/$config is missing"
+        exit 1
+    fi
+done
+
 # Update M3U
 update

readme.md

@@ -13,7 +13,8 @@ Takes [iptv-org](https://github.com/iptv-org) data and creates a custom m3u
 
 ## Usage
 
-1. Customize the languages, countries and categories in the respective json files in the `config` folder using the ids from the respective csv here: https://github.com/iptv-org/database/blob/master/data
-2. Run `npm install`
-3. Run `./iptv-m3u-update`
-4. Load your freshly generated `channels.m3u`
+1. Copy the example config files in the `config` folder to the equivalent file names without the `.example` (ie: copy `config/$x.example.json` to `config/$x.json`)
+2. Edit the newly created non-example files in the `config` folder to customize the set of languages, countries and categories using the `id` attributes of the respective csv files here: https://github.com/iptv-org/database/blob/master/data
+3. Run `npm install`
+4. Run `./iptv-m3u-update`
+5. Load your freshly generated `channels.m3u`