Make command_key configurable

Fixes #487

README.md

@@ -187,6 +187,8 @@ configuration during runtime use the `reload` statement in the command prompt
 
 Possible configuration values are:
 
+* `command_key`: Key to open command line <single character>, set to `:` by
+  default
 * `use_nerdfont`: Turn nerdfont glyphs on/off <true/false>
 * `flip_status_indicators`: By default the statusbar will show a play icon when
    a track is playing and a pause icon when playback is stopped. If this setting

src/config.rs

@@ -16,6 +16,7 @@ pub const CLIENT_ID: &str = "d420a117a32841c2b3474932e49fb54b";
 
 #[derive(Clone, Serialize, Deserialize, Debug, Default)]
 pub struct ConfigValues {
+    pub command_key: Option<char>,
     pub default_keybindings: Option<bool>,
     pub keybindings: Option<HashMap<String, String>>,
     pub theme: Option<ConfigTheme>,

src/main.rs

@@ -11,6 +11,7 @@ use std::str::FromStr;
 use std::sync::Arc;
 
 use clap::{App, Arg};
+use cursive::event::EventTrigger;
 use cursive::traits::Identifiable;
 use librespot_core::authentication::Credentials;
 use librespot_core::cache::Cache;
@@ -229,13 +230,23 @@ async fn main() -> Result<(), String> {
     // initial screen is library
     layout.set_screen("library");
 
-    cursive.add_global_callback(':', move |s| {
-        if s.find_name::<ContextMenu>("contextmenu").is_none() {
-            s.call_on_name("main", |v: &mut ui::layout::Layout| {
-                v.enable_cmdline();
-            });
-        }
-    });
+    let cmd_key = |cfg: Arc<Config>| cfg.values().command_key.unwrap_or(':');
+
+    {
+        let c = cfg.clone();
+        cursive.set_on_post_event(
+            EventTrigger::from_fn(move |event| {
+                event == &cursive::event::Event::Char(cmd_key(c.clone()))
+            }),
+            move |s| {
+                if s.find_name::<ContextMenu>("contextmenu").is_none() {
+                    s.call_on_name("main", |v: &mut ui::layout::Layout| {
+                        v.enable_cmdline(cmd_key(cfg.clone()));
+                    });
+                }
+            },
+        );
+    }
 
     cursive.add_global_callback('/', move |s| {
         if s.find_name::<ContextMenu>("contextmenu").is_none() {

src/ui/layout.rs

@@ -56,9 +56,9 @@ impl Layout {
         }
     }
 
-    pub fn enable_cmdline(&mut self) {
+    pub fn enable_cmdline(&mut self, prefix: char) {
         if !self.cmdline_focus {
-            self.cmdline.set_content(":");
+            self.cmdline.set_content(prefix);
             self.cmdline_focus = true;
         }
     }