conf/shortcuts: add shortcut for COMMAND mode

Replace hardcoded Key value with customisable shortcut
"general.enter_command_mode"

meli.conf.5

@@ -441,6 +441,12 @@ exit_thread = 'i'
 .Pp
 .Em general
 .Bl -tag -width 36n
+.It Ic enter_command_mode
+Enter
+.Em COMMAND
+mode.
+.\" default value
+.Pq Ql Em \ 
 .It Ic next_tab
 Go to next tab.
 .\" default value

src/bin.rs

@@ -343,6 +343,13 @@ fn run_app(opt: Opt) -> Result<()> {
         state.register_component(xdg_notifications);
         state.register_component(Box::new(components::notifications::NotificationFilter {}));
     }
+    let enter_command_mode: Key = state
+        .context
+        .settings
+        .shortcuts
+        .general
+        .enter_command_mode
+        .clone();
 
     /* Keep track of the input mode. See UIMode for details */
     'main: loop {
@@ -397,7 +404,7 @@ fn run_app(opt: Opt) -> Result<()> {
                                                 state.redraw();
                                             }
                                         },
-                                        Key::Char(' ') => {
+                                        _ if k == enter_command_mode => {
                                             state.mode = UIMode::Command;
                                             state.rcv_event(UIEvent::ChangeMode(UIMode::Command));
                                             state.redraw();

src/conf/shortcuts.rs

@@ -79,7 +79,7 @@ macro_rules! shortcut_key_values {
         #[serde(default)]
         #[serde(rename = $cname)]
         pub struct $name {
-            $($fname : Key),*
+            $(pub $fname : Key),*
         }
 
         impl $name {
@@ -163,6 +163,7 @@ shortcut_key_values! { "pager",
 
 shortcut_key_values! { "general",
     pub struct GeneralShortcuts {
+        enter_command_mode |> "Enter COMMAND mode." |> Key::Char(' '),
         go_to_tab |> "Go to the nth tab" |> Key::Alt('n'),
         next_tab |> "Next tab." |> Key::Char('T'),
         scroll_right |> "Generic scroll right (catch-all setting)" |> Key::Right,