Merge pull request #821 from helix-editor/idle-timer

Idle timer / Autocompletion

1 files changed, 31 insertions, 1 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index b08a2df2..5af6dbf3 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -9,10 +9,12 @@ use crate::{
 use futures_util::future;
 use std::{
     path::{Path, PathBuf},
+    pin::Pin,
     sync::Arc,
-    time::Duration,
 };
 
+use tokio::time::{sleep, Duration, Instant, Sleep};
+
 use slotmap::SlotMap;
 
 use anyhow::Error;
@@ -24,6 +26,14 @@ use helix_core::Position;
 
 use serde::Deserialize;
 
+fn deserialize_duration_millis<'de, D>(deserializer: D) -> Result<Duration, D::Error>
+where
+    D: serde::Deserializer<'de>,
+{
+    let millis = u64::deserialize(deserializer)?;
+    Ok(Duration::from_millis(millis))
+}
+
 #[derive(Debug, Clone, PartialEq, Deserialize)]
 #[serde(rename_all = "kebab-case", default)]
 pub struct Config {
@@ -43,6 +53,9 @@ pub struct Config {
     pub smart_case: bool,
     /// Automatic insertion of pairs to parentheses, brackets, etc. Defaults to true.
     pub auto_pairs: bool,
+    /// Time in milliseconds since last keypress before idle timers trigger. Used for autocompletion, set to 0 for instant. Defaults to 400ms.
+    #[serde(skip_serializing, deserialize_with = "deserialize_duration_millis")]
+    pub idle_timeout: Duration,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
@@ -70,6 +83,7 @@ impl Default for Config {
             middle_click_paste: true,
             smart_case: true,
             auto_pairs: true,
+            idle_timeout: Duration::from_millis(400),
         }
     }
 }
@@ -91,6 +105,8 @@ pub struct Editor {
     pub status_msg: Option<(String, Severity)>,
 
     pub config: Config,
+
+    pub idle_timer: Pin<Box<Sleep>>,
 }
 
 #[derive(Debug, Copy, Clone)]
@@ -125,10 +141,24 @@ impl Editor {
             registers: Registers::default(),
             clipboard_provider: get_clipboard_provider(),
             status_msg: None,
+            idle_timer: Box::pin(sleep(Duration::from_millis(500))),
             config,
         }
     }
 
+    pub fn clear_idle_timer(&mut self) {
+        // equivalent to internal Instant::far_future() (30 years)
+        self.idle_timer
+            .as_mut()
+            .reset(Instant::now() + Duration::from_secs(86400 * 365 * 30));
+    }
+
+    pub fn reset_idle_timer(&mut self) {
+        self.idle_timer
+            .as_mut()
+            .reset(Instant::now() + Duration::from_millis(500));
+    }
+
     pub fn clear_status(&mut self) {
         self.status_msg = None;
     }