feat: add interactive pick project flow

src/main.rs

@@ -7,7 +7,7 @@ mod sync;
 
 use std::process::ExitCode;
 
-use anyhow::{Context, Result};
+use anyhow::{Context, Result, bail};
 use clap::Parser;
 use colored::Colorize;
 
@@ -56,14 +56,43 @@ fn run(cli: &cli::Cli) -> Result<()> {
         return Ok(());
     }
 
-    let name = cli
-        .project
-        .as_deref()
-        .expect("clap guarantees <PROJECT> or --list");
+    let name = if cli.pick {
+        match pick_project(&cfg)? {
+            Some(name) => name,
+            None => return Ok(()),
+        }
+    } else {
+        cli.project
+            .clone()
+            .expect("clap guarantees <PROJECT> or a mode flag")
+    };
     let project = cfg
         .projects
-        .get(name)
+        .get(&name)
         .with_context(|| format!("project '{name}' not found in {}", path.display()))?;
 
-    deploy::deploy(name, project, cli.dry_run)
+    deploy::deploy(&name, project, cli.dry_run)
+}
+
+fn pick_project(cfg: &config::Config) -> Result<Option<String>> {
+    use dialoguer::FuzzySelect;
+
+    use std::io::IsTerminal;
+    if !std::io::stdout().is_terminal() {
+        bail!("interactive picker needs a real terminal; use --list instead");
+    }
+    let names: Vec<&str> = cfg.projects.keys().map(String::as_str).collect();
+    match FuzzySelect::new()
+        .with_prompt("Pick a project")
+        .items(&names)
+        .default(0)
+        .interact()
+    {
+        Ok(idx) => Ok(Some(names[idx].to_string())),
+        Err(dialoguer::Error::IO(err)) if err.kind() == std::io::ErrorKind::Interrupted => {
+            println!("cancelled.");
+            Ok(None)
+        }
+        Err(err) => Err(err).context("project selection failed"),
+    }
 }