Reduce calculation and improve pattern in infobox

- switch to use static OnceCell to calculate Info once
- pass Vec<(&[KeyEvent], &str)> rather than Vec<(Vec<KeyEvent>, &str)>
- expr -> tt to allow using | as separator, make it more like match

helix-term/src/commands.rs

@@ -34,7 +34,6 @@
 
 use crate::{
     compositor::{self, Component, Compositor},
-    key,
     ui::{self, Picker, Popup, Prompt, PromptEvent},
 };
 
@@ -48,7 +47,7 @@
     path::{Path, PathBuf},
 };
 
-use once_cell::sync::Lazy;
+use once_cell::sync::{Lazy, OnceCell};
 use serde::de::{self, Deserialize, Deserializer};
 
 pub struct Context<'a> {
@@ -3414,13 +3413,11 @@ fn select_register(cx: &mut Context) {
 }
 
 macro_rules! mode_info {
-    // TODO: how to use one expr for both pat and expr?
-    // TODO: how to use replaced function name as str at compile time?
-    // TODO: extend to support multiple keys, but first solve the other two
+    // TODO: reuse $mode for $stat
     (@join $first:expr $(,$rest:expr)*) => {
         concat!($first, $(", ", $rest),*)
     };
-    {$mode:ident, $name:literal, $(#[doc = $desc:literal] $($key:expr),+ => $func:expr),+,} => {
+    {$mode:ident, $stat:ident, $name:literal, $(#[doc = $desc:literal] $($key:tt)|+ => $func:expr),+,} => {
         #[doc = $name]
         #[doc = ""]
         #[doc = "<table><tr><th>key</th><th>desc</th></tr><tbody>"]
@@ -3439,12 +3436,14 @@ macro_rules! mode_info {
         )+
         #[doc = "</tbody></table>"]
         pub fn $mode(cx: &mut Context) {
-            cx.editor.autoinfo = Some(Info::key(
+            static $stat: OnceCell<Info> = OnceCell::new();
+            cx.editor.autoinfo = Some($stat.get_or_init(|| Info::key(
                 $name,
-                vec![$((vec![$($key.parse().unwrap()),+], $desc)),+],
-            ));
+                vec![$((&[$($key.parse().unwrap()),+], $desc)),+],
+            )));
             use helix_core::hashmap;
-            let mut map = hashmap! {
+            // TODO: try and convert this to match later
+            let map = hashmap! {
                 $($($key.parse::<KeyEvent>().unwrap() => $func as for<'r, 's> fn(&'r mut Context<'s>)),+),*
             };
             cx.on_next_key_mode(map);
@@ -3453,7 +3452,7 @@ pub fn $mode(cx: &mut Context) {
 }
 
 mode_info! {
-    space_mode, "space mode",
+    space_mode, SPACE_MODE, "space mode",
     /// file picker
     "f" => file_picker,
     /// buffer picker

helix-term/src/keymap.rs

@@ -1,11 +1,7 @@
 pub use crate::commands::Command;
 use crate::config::Config;
 use helix_core::hashmap;
-use helix_view::{
-    document::Mode,
-    input::KeyEvent,
-    keyboard::{KeyCode, KeyModifiers},
-};
+use helix_view::{document::Mode, input::KeyEvent};
 use serde::Deserialize;
 use std::{
     collections::HashMap,
@@ -352,6 +348,7 @@ pub fn merge_keys(mut config: Config) -> Config {
 
 #[test]
 fn merge_partial_keys() {
+    use helix_view::keyboard::{KeyCode, KeyModifiers};
     let config = Config {
         keys: Keymaps(hashmap! {
             Mode::Normal => hashmap! {

helix-term/src/ui/info.rs

@@ -1,5 +1,5 @@
 use crate::compositor::{Component, Context};
-use helix_view::graphics::{Margin, Rect, Style};
+use helix_view::graphics::Rect;
 use helix_view::info::Info;
 use tui::buffer::Buffer as Surface;
 use tui::widgets::{Block, Borders, Widget};

helix-view/src/editor.rs

@@ -33,7 +33,7 @@ pub struct Editor {
     pub syn_loader: Arc<syntax::Loader>,
     pub theme_loader: Arc<theme::Loader>,
 
-    pub autoinfo: Option<Info>,
+    pub autoinfo: Option<&'static Info>,
     pub status_msg: Option<(String, Severity)>,
 }
 

helix-view/src/info.rs

@@ -16,7 +16,7 @@ pub struct Info {
 }
 
 impl Info {
-    pub fn key(title: &'static str, body: Vec<(Vec<KeyEvent>, &'static str)>) -> Info {
+    pub fn key(title: &'static str, body: Vec<(&[KeyEvent], &'static str)>) -> Info {
         let keymaps_width: u16 = body
             .iter()
             .map(|r| r.0.iter().map(|e| e.width() as u16 + 2).sum::<u16>() - 2)
@@ -25,11 +25,11 @@ pub fn key(title: &'static str, body: Vec<(Vec<KeyEvent>, &'static str)>) -> Inf
         let mut text = String::new();
         let mut width = 0;
         let height = body.len() as u16;
-        for (mut keyevents, desc) in body {
-            let keyevent = keyevents.remove(0);
+        for (keyevents, desc) in body {
+            let keyevent = keyevents[0];
             let mut left = keymaps_width - keyevent.width() as u16;
             write!(text, "{}", keyevent).ok();
-            for keyevent in keyevents {
+            for keyevent in &keyevents[1..] {
                 write!(text, ", {}", keyevent).ok();
                 left -= 2 + keyevent.width() as u16;
             }