Add 'ls' command

ci/release_notes.md

@@ -1 +1,2 @@
 - Report `crate_version` on stderr in concourse operations
+- Add `ls` command - `cepler ls -e <environment>` lists all files tracked by the current config.

src/cli.rs

@@ -21,6 +21,10 @@ fn app() -> App<'static, 'static> {
           (about: "Check wether the environment needs deploying. Exit codes: 0 - needs deploying; 1 - internal error; 2 - nothing to deploy")
           (@arg ENVIRONMENT: -e --("environment") env("CEPLER_ENVIRONMENT") +required +takes_value "The cepler environment")
         )
+        (@subcommand ls =>
+          (about: "List all files relevent to a given environment")
+          (@arg ENVIRONMENT: -e --("environment") env("CEPLER_ENVIRONMENT") +required +takes_value "The cepler environment")
+        )
         (@subcommand record =>
           (about: "Record the state of an environment in the statefile")
           (@arg ENVIRONMENT: -e --("environment") env("CEPLER_ENVIRONMENT") +required +takes_value "The cepler environment")
@@ -79,6 +83,7 @@ pub fn run() -> Result<()> {
     }
     match matches.subcommand() {
         ("check", Some(sub_matches)) => check(sub_matches, &matches),
+        ("ls", Some(sub_matches)) => ls(sub_matches, &matches),
         ("prepare", Some(sub_matches)) => prepare(sub_matches, conf_from_matches(&matches)?),
         ("record", Some(sub_matches)) => record(sub_matches, conf_from_matches(&matches)?),
         ("concourse", Some(sub_matches)) => match sub_matches.subcommand() {
@@ -112,6 +117,21 @@ fn check(matches: &ArgMatches, main_matches: &ArgMatches) -> Result<()> {
     }
     Ok(())
 }
+
+fn ls(matches: &ArgMatches, main_matches: &ArgMatches) -> Result<()> {
+    let env = matches.value_of("ENVIRONMENT").unwrap();
+    let config = conf_from_matches(main_matches)?;
+    let ws = Workspace::new(config.1)?;
+    let env = config
+        .0
+        .environments
+        .get(env)
+        .context(format!("Environment '{}' not found in config", env))?;
+    for path in ws.ls(env)? {
+        println!("{}", path);
+    }
+    Ok(())
+}
 fn prepare(matches: &ArgMatches, config: (Config, String)) -> Result<()> {
     let env = matches.value_of("ENVIRONMENT").unwrap();
     let force_clean: bool = matches.is_present("FORCE_CLEAN");

src/workspace.rs

@@ -14,6 +14,12 @@ impl Workspace {
         })
     }
 
+    pub fn ls(&self, env: &EnvironmentConfig) -> Result<Vec<String>> {
+        let repo = Repo::open()?;
+        let new_env_state = self.construct_env_state(&repo, env, false)?;
+        Ok(new_env_state.files.into_iter().map(|(k, _)| k).collect())
+    }
+
     pub fn check(&self, env: &EnvironmentConfig) -> Result<Option<(String, Vec<DiffElem>)>> {
         let repo = Repo::open()?;
         if let Some(previous_env) = env.propagated_from() {