created a new struct for a layout without opening a yaml file

src/main.rs

@@ -26,5 +26,5 @@ pub struct Opt {
 fn main() {
     //parse parameter
     let opt = Opt::from_args();
-    ui::Ui::run(&opt);
+    ui::create_ui(&opt);
 }

src/ui/default.rs

@@ -1,8 +1,7 @@
-use std::sync::mpsc;
 use std::{io, thread};
 
+use crate::Opt;
 use termion::event::Key;
-use termion::input::TermRead;
 use termion::raw::IntoRawMode;
 use tui::backend::TermionBackend;
 use tui::layout::{Constraint, Direction, Layout};
@@ -12,7 +11,6 @@ use crate::widget::info;
 use crate::widget::repo_entry;
 use crate::widget::service_switcher;
 use crate::widget::tag_list;
-use crate::Opt;
 
 pub struct Ui {
     state: State,
@@ -56,7 +54,7 @@ impl Ui {
             state: State::SelectService,
             repo: repo_entry::RepoEntry::new(repo_id),
             tags: tag_list::TagList::with_status("Tags are empty"),
-            services: service_switcher::ServiceSwitcher::new(&opt.config),
+            services: service_switcher::ServiceSwitcher::new(&opt.config).unwrap(),
             info: info::Info::new("Select image of edit Repository"),
         };
 
@@ -70,7 +68,7 @@ impl Ui {
         let mut terminal = Terminal::new(backend).unwrap();
 
         //setup input thread
-        let receiver = ui.spawn_stdin_channel();
+        let receiver = super::spawn_stdin_channel();
 
         //core interaction loop
         'core: loop {
@@ -212,18 +210,4 @@ impl Ui {
 
         terminal.clear().unwrap();
     }
-
-    /// create a thread for catching input and send them to core loop
-    pub fn spawn_stdin_channel(&self) -> mpsc::Receiver<termion::event::Key> {
-        let (tx, rx) = mpsc::channel::<termion::event::Key>();
-
-        thread::spawn(move || loop {
-            let stdin = io::stdin();
-            for c in stdin.keys() {
-                tx.send(c.unwrap()).unwrap();
-            }
-        });
-        thread::sleep(std::time::Duration::from_millis(64));
-        rx
-    }
 }

src/ui/mod.rs

@@ -0,0 +1,32 @@
+mod default;
+mod no_yaml;
+
+use std::sync::mpsc;
+use std::{io, thread};
+
+use crate::Opt;
+use termion::input::TermRead;
+
+use crate::widget::service_switcher;
+
+pub fn create_ui(opt: &Opt) {
+    let service_result = service_switcher::ServiceSwitcher::new(&opt.config);
+    match service_result {
+        None => no_yaml::NoYaml::run(opt),
+        Some(_) => default::Ui::run(opt),
+    }
+}
+
+/// create a thread for catching input and send them to core loop
+pub fn spawn_stdin_channel() -> mpsc::Receiver<termion::event::Key> {
+    let (tx, rx) = mpsc::channel::<termion::event::Key>();
+
+    thread::spawn(move || loop {
+        let stdin = io::stdin();
+        for c in stdin.keys() {
+            tx.send(c.unwrap()).unwrap();
+        }
+    });
+    thread::sleep(std::time::Duration::from_millis(64));
+    rx
+}

src/ui/no_yaml.rs

@@ -0,0 +1,138 @@
+use std::{io, thread};
+
+use termion::event::Key;
+use termion::raw::IntoRawMode;
+use tui::backend::TermionBackend;
+use tui::layout::{Constraint, Direction, Layout};
+use tui::Terminal;
+
+use crate::widget::info;
+use crate::widget::repo_entry;
+use crate::widget::tag_list;
+use crate::Opt;
+
+#[derive(PartialEq, Clone)]
+pub enum State {
+    EditRepo,
+    SelectTag,
+}
+
+impl std::iter::Iterator for State {
+    type Item = Self;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self {
+            State::EditRepo => *self = State::SelectTag,
+            State::SelectTag => *self = State::EditRepo,
+        }
+        Some(self.clone())
+    }
+}
+
+pub struct NoYaml {
+    state: State,
+    repo: repo_entry::RepoEntry,
+    tags: tag_list::TagList,
+    info: info::Info,
+}
+
+impl NoYaml {
+    pub fn run(opt: &Opt) {
+        let (repo, load_repo) = match &opt.repo {
+            None => (
+                repo_entry::RepoEntry::new(
+                    "enter a repository or select one from docker-compose.yml",
+                ),
+                false,
+            ),
+            Some(repo_id) => (repo_entry::RepoEntry::new(repo_id), true),
+        };
+
+        let mut ui = NoYaml {
+            state: State::EditRepo,
+            repo,
+            tags: tag_list::TagList::with_status("Tags are empty"),
+            info: info::Info::new("edit the Repository widget to load tags"),
+        };
+
+        // load tags if a repository was given thorugh paramter
+        if load_repo {
+            ui.tags = tag_list::TagList::with_repo(ui.repo.get());
+        }
+
+        //setup tui
+        let stdout = io::stdout().into_raw_mode().unwrap();
+        let backend = TermionBackend::new(stdout);
+        let mut terminal = Terminal::new(backend).unwrap();
+
+        //setup input thread
+        let receiver = super::spawn_stdin_channel();
+
+        //core interaction loop
+        'core: loop {
+            //draw
+            terminal
+                .draw(|rect| {
+                    let chunks = Layout::default()
+                        .direction(Direction::Vertical)
+                        .constraints(
+                            [
+                                Constraint::Length(3),
+                                Constraint::Min(7),
+                                Constraint::Length(2),
+                            ]
+                            .as_ref(),
+                        )
+                        .split(rect.size());
+
+                    rect.render_widget(ui.repo.render(ui.state == State::EditRepo), chunks[0]);
+                    let (list, state) = ui.tags.render(ui.state == State::SelectTag);
+                    rect.render_stateful_widget(list, chunks[1], state);
+                    rect.render_widget(ui.info.render(), chunks[2]);
+                })
+                .unwrap();
+
+            //handle input
+            match receiver.try_recv() {
+                Ok(Key::Ctrl('q')) => break 'core,
+                Ok(Key::Char('\t')) => {
+                    ui.state.next();
+                }
+                Ok(Key::Ctrl('r')) => {
+                    ui.repo.confirm();
+                    ui.tags = tag_list::TagList::with_repo(ui.repo.get());
+                }
+                Ok(Key::Ctrl('n')) => match ui.tags.next_page() {
+                    Err(e) => ui.info.set_info(&format!("{}", e)),
+                    Ok(_) => (),
+                },
+                Ok(Key::Ctrl('p')) => match ui.tags.prev_page() {
+                    Err(e) => ui.info.set_info(&format!("{}", e)),
+                    Ok(_) => (),
+                },
+                Ok(Key::Char('\n')) => match ui.state {
+                    State::EditRepo => {
+                        ui.repo.confirm();
+                        ui.tags = tag_list::TagList::with_repo(ui.repo.get());
+                    }
+                    _ => (),
+                },
+                Ok(Key::Char(key)) => match ui.state {
+                    State::EditRepo => {
+                        ui.info.set_info("Editing Repository");
+                        ui.repo.handle_input(Key::Char(key));
+                    }
+                    State::SelectTag => {
+                        ui.tags.handle_input(Key::Char(key));
+                    }
+                },
+                _ => (),
+            }
+
+            //sleep for 32ms (30 fps)
+            thread::sleep(std::time::Duration::from_millis(32));
+        }
+
+        terminal.clear().unwrap();
+    }
+}

src/widget/repo_entry.rs

@@ -3,8 +3,6 @@ use tui::layout::Alignment;
 use tui::style::{Color, Style};
 use tui::widgets::{Block, Borders, Paragraph};
 
-use crate::ui::State;
-
 pub struct RepoEntry {
     text: String,
     old_text: String,

src/widget/service_switcher.rs

@@ -9,7 +9,6 @@ use tui::style::{Color, Style};
 use tui::widgets::{Block, Borders, List, ListState};
 
 use crate::repo;
-use crate::ui::State;
 
 #[derive(Debug)]
 pub enum Error {
@@ -34,7 +33,7 @@ pub struct ServiceSwitcher {
 }
 
 impl ServiceSwitcher {
-    pub fn new(file: &Option<PathBuf>) -> Self {
+    pub fn new(file: &Option<PathBuf>) -> Option<Self> {
         let mut file_list = vec![
             PathBuf::from("docker-compose.yml"),
             PathBuf::from("docker-compose.yaml"),
@@ -55,21 +54,16 @@ impl ServiceSwitcher {
                 }
             };
 
-            return Self {
+            return Some(Self {
                 list,
                 state: ListState::default(),
                 changed: false,
                 opened_file: file,
-            };
+            });
         }
 
         //could not find docker-compose file
-        Self {
-            list: vec![format!("No docker-compose file found")],
-            state: ListState::default(),
-            changed: false,
-            opened_file: PathBuf::new(),
-        }
+        None
     }
 
     pub fn render(&mut self, colored: bool) -> (List, &mut ListState) {

src/widget/tag_list.rs

@@ -5,7 +5,6 @@ use tui::style::{Color, Style};
 use tui::widgets::{Block, Borders, List, ListState};
 
 use crate::tags;
-use crate::ui::State;
 
 #[derive(Debug)]
 pub enum Error {