feat(ui): added a help / status bar for keybindings and modes

To implement this status bar as a plugin (https://github.com/mosaic-org/status-bar/blob/master/src/main.rs), the following bits of infrastructure were changed:
- Layouts can now have an exact size constraint (1 row high, for example)
- Unconstrained blocks in a layout are now grown to fill the remaining space
- Default plugins and layouts are now stored in an OS-dependent data directory. The initial installation of these assets is done a build-time via `build.rs`
- All new tabs are created with a user-configurable default layout, unless provided with a different layout
- Plugins can now capture *all* key presses detected by Mosaic via `global_handle_key()`
- Plugins can now control whether or not they are selectable via `set_selectable()`
- Plugins can now fetch a vector of help-strings from Mosaic, which is currently being used to display helpful keybindings, via `get_help()`
- Also patched up all remaining compiler warnings and 23 of the 25 clippy lints on main

1 files changed, 8 insertions, 0 deletions

diff --git a/src/errors.rs b/src/errors.rs
index e53bbc30..cb483bbc 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -166,6 +166,7 @@ pub enum ScreenContext {
     ClearScroll,
     CloseFocusedPane,
     ToggleActiveTerminalFullscreen,
+    SetSelectable,
     ClosePane,
     ApplyLayout,
     NewTab,
@@ -200,6 +201,7 @@ impl From<&ScreenInstruction> for ScreenContext {
             ScreenInstruction::ToggleActiveTerminalFullscreen => {
                 ScreenContext::ToggleActiveTerminalFullscreen
             }
+            ScreenInstruction::SetSelectable(..) => ScreenContext::SetSelectable,
             ScreenInstruction::ClosePane(_) => ScreenContext::ClosePane,
             ScreenInstruction::ApplyLayout(_) => ScreenContext::ApplyLayout,
             ScreenInstruction::NewTab(_) => ScreenContext::NewTab,
@@ -244,6 +246,7 @@ pub enum PluginContext {
     Load,
     Draw,
     Input,
+    GlobalInput,
     Unload,
     Quit,
 }
@@ -254,6 +257,7 @@ impl From<&PluginInstruction> for PluginContext {
             PluginInstruction::Load(..) => PluginContext::Load,
             PluginInstruction::Draw(..) => PluginContext::Draw,
             PluginInstruction::Input(..) => PluginContext::Input,
+            PluginInstruction::GlobalInput(_) => PluginContext::GlobalInput,
             PluginInstruction::Unload(_) => PluginContext::Unload,
             PluginInstruction::Quit => PluginContext::Quit,
         }
@@ -262,6 +266,8 @@ impl From<&PluginInstruction> for PluginContext {
 
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum AppContext {
+    GetState,
+    SetState,
     Exit,
     Error,
 }
@@ -269,6 +275,8 @@ pub enum AppContext {
 impl From<&AppInstruction> for AppContext {
     fn from(app_instruction: &AppInstruction) -> Self {
         match *app_instruction {
+            AppInstruction::GetState(_) => AppContext::GetState,
+            AppInstruction::SetState(_) => AppContext::SetState,
             AppInstruction::Exit => AppContext::Exit,
             AppInstruction::Error(_) => AppContext::Error,
         }