Add docstrings to the mh-edit command

src/bin/mh-edit.rs

@@ -1,6 +1,6 @@
 use paste::paste;
 use std::path::PathBuf;
-use structopt::StructOpt;
+use structopt::{clap::AppSettings, StructOpt};
 
 use musichoard::{
     database::json::{backend::JsonDatabaseFileBackend, JsonDatabase},
@@ -11,20 +11,23 @@ use musichoard::{
 type MH = MusicHoard<NoLibrary, JsonDatabase<JsonDatabaseFileBackend>>;
 
 #[derive(StructOpt, Debug)]
+#[structopt(about = "mh-edit: edit the MusicHoard database",
+            global_settings=&[AppSettings::DeriveDisplayOrder])]
 struct Opt {
-    #[structopt(subcommand)]
-    category: Category,
-
     #[structopt(
         long = "database",
         name = "database file path",
         default_value = "database.json"
     )]
     database_file_path: PathBuf,
+
+    #[structopt(subcommand)]
+    category: Category,
 }
 
 #[derive(StructOpt, Debug)]
 enum Category {
+    #[structopt(about = "Edit artist information")]
     Artist(ArtistCommand),
 }
 
@@ -38,38 +41,51 @@ impl Category {
 
 #[derive(StructOpt, Debug)]
 enum ArtistCommand {
+    #[structopt(about = "Add a new artist to the collection")]
     New(ArtistValue),
+    #[structopt(about = "Delete an artist from the collection")]
     Delete(ArtistValue),
-    #[structopt(name = "musicbrainz")]
+    #[structopt(name = "musicbrainz", about = "Edit the MusicBrainz URL of an artist")]
     MusicBrainz(UrlCommand<SingleUrlValue>),
-    #[structopt(name = "musicbutler")]
+    #[structopt(name = "musicbutler", about = "Edit the MusicButler URL of an artist")]
     MusicButler(UrlCommand<MultiUrlValue>),
+    #[structopt(about = "Edit the Bandcamp URL of an artist")]
     Bandcamp(UrlCommand<MultiUrlValue>),
+    #[structopt(about = "Edit the Qobuz URL of an artist")]
     Qobuz(UrlCommand<SingleUrlValue>),
 }
 
 #[derive(StructOpt, Debug)]
 struct ArtistValue {
+    #[structopt(help = "The name of the artist")]
     artist: String,
 }
 
 #[derive(StructOpt, Debug)]
 enum UrlCommand<T: StructOpt> {
+    #[structopt(about = "Add URL(s) without overwriting existing values")]
     Add(T),
+    #[structopt(about = "Remove the provided URL(s)")]
     Remove(T),
+    #[structopt(about = "Set the provided URL(s) overwriting any previous values")]
     Set(T),
+    #[structopt(about = "Clear all URL(s)")]
     Clear(ArtistValue),
 }
 
 #[derive(StructOpt, Debug)]
 struct SingleUrlValue {
+    #[structopt(help = "The name of the artist")]
     artist: String,
+    #[structopt(help = "The URL")]
     url: String,
 }
 
 #[derive(StructOpt, Debug)]
 struct MultiUrlValue {
+    #[structopt(help = "The name of the artist")]
     artist: String,
+    #[structopt(help = "The list of URLs")]
     urls: Vec<String>,
 }