cli/list: add filtering by group

Closes #23

src/cli.rs

@@ -41,7 +41,7 @@ pub enum SubCommand {
     Remove(self::remove::Args),
     Priority(self::priority::Args),
     #[clap(visible_alias("ls"))]
-    List,
+    List(self::list::Args),
     #[clap(visible_alias("st"))]
     Start(self::start::Args),
     Pause,

src/cli/list.rs

@@ -16,7 +16,12 @@
 use crate::domain::CurrentTaskInfo;
 use crate::repo::Repository;
 
-pub fn execute(repo: impl Repository) {
+#[derive(clap::Args)]
+pub struct Args {
+    groups: Vec<String>,
+}
+
+pub fn execute(repo: impl Repository, args: Args) {
     let tasks = match repo.get_tasks() {
         Ok(tasks) => tasks,
         Err(err) => return eprintln!("Cannot read tasks: {}", err),
@@ -29,7 +34,21 @@ pub fn execute(repo: impl Repository) {
         }
     };
 
-    for (i, task) in tasks.iter().enumerate() {
+    let groups = args
+        .groups
+        .into_iter()
+        .map(|g| match g.as_str() {
+            "-" => None,
+            _ => Some(g),
+        })
+        .collect::<Vec<_>>();
+
+    let filtered_tasks = tasks
+        .iter()
+        .enumerate()
+        .filter(|(_, t)| groups.is_empty() || groups.contains(&t.group));
+
+    for (i, task) in filtered_tasks {
         let idx = i + 1;
 
         match cur_task {

src/main.rs

@@ -50,8 +50,8 @@ fn main() {
         cli::SubCommand::Remove(args) => {
             cli::remove::execute(repo, args);
         }
-        cli::SubCommand::List => {
-            cli::list::execute(repo);
+        cli::SubCommand::List(args) => {
+            cli::list::execute(repo, args);
         }
         cli::SubCommand::Priority(args) => {
             cli::priority::execute(repo, args);