feat(config): add toggle_key option

espanso-config/src/config/mod.rs

@@ -51,6 +51,9 @@ pub trait Config: Send {
 
   // TODO: add other delay options (start by the ones needed in clipboard injector)
 
+  // Defines the key that disables/enables espanso when double pressed
+  fn toggle_key(&self) -> Option<ToggleKey>;
+
   fn is_match<'a>(&self, app: &AppProperties<'a>) -> bool;
 }
 
@@ -75,6 +78,23 @@ pub enum Backend {
   Auto,
 }
 
+
+#[derive(Debug, Copy, Clone)]
+pub enum ToggleKey {
+  Ctrl,
+  Meta,
+  Alt,
+  Shift,
+  RightCtrl,
+  RightAlt,
+  RightShift,
+  RightMeta,
+  LeftCtrl,
+  LeftAlt,
+  LeftShift,
+  LeftMeta,
+}
+
 pub fn load_store(config_dir: &Path) -> Result<impl ConfigStore> {
   store::DefaultConfigStore::load(config_dir)
 }

espanso-config/src/config/parse/mod.rs

@@ -32,6 +32,8 @@ pub(crate) struct ParsedConfig {
 
   pub pre_paste_delay: Option<usize>,
 
+  pub toggle_key: Option<String>,
+
   // Includes
   pub includes: Option<Vec<String>>,
   pub excludes: Option<Vec<String>>,

espanso-config/src/config/parse/yaml.rs

@@ -39,6 +39,9 @@ pub(crate) struct YAMLConfig {
   #[serde(default)]
   pub pre_paste_delay: Option<usize>,
 
+  #[serde(default)]
+  pub toggle_key: Option<String>,
+
   #[serde(default)]
   pub includes: Option<Vec<String>>,
 
@@ -92,6 +95,8 @@ impl TryFrom<YAMLConfig> for ParsedConfig {
 
       pre_paste_delay: yaml_config.pre_paste_delay,
 
+      toggle_key: yaml_config.toggle_key,
+
       use_standard_includes: yaml_config.use_standard_includes,
       includes: yaml_config.includes,
       extra_includes: yaml_config.extra_includes,
@@ -119,6 +124,7 @@ mod tests {
     backend: clipboard
     clipboard_threshold: 200
     pre_paste_delay: 300
+    toggle_key: CTRL
       
     use_standard_includes: true
     includes: ["test1"]
@@ -144,6 +150,8 @@ mod tests {
         clipboard_threshold: Some(200),
 
         pre_paste_delay: Some(300),
+        
+        toggle_key: Some("CTRL".to_string()),
 
         use_standard_includes: Some(true),
         includes: Some(vec!["test1".to_string()]),

espanso-config/src/config/resolve.rs

@@ -22,7 +22,7 @@ use super::{
   parse::ParsedConfig,
   path::calculate_paths,
   util::os_matches,
-  AppProperties, Backend, Config,
+  AppProperties, Backend, Config, ToggleKey,
 };
 use crate::{counter::next_id, merge};
 use anyhow::Result;
@@ -124,6 +124,7 @@ impl Config for ResolvedConfig {
   }
 
   fn backend(&self) -> Backend {
+    // TODO: test
     match self
       .parsed
       .backend
@@ -134,6 +135,7 @@ impl Config for ResolvedConfig {
       Some("clipboard") => Backend::Clipboard,
       Some("inject") => Backend::Inject,
       Some("auto") => Backend::Auto,
+      None => Backend::Auto,
       err => {
         error!("invalid backend specified {:?}, falling back to Auto", err);
         Backend::Auto
@@ -154,6 +156,36 @@ impl Config for ResolvedConfig {
       .pre_paste_delay
       .unwrap_or(DEFAULT_PRE_PASTE_DELAY)
   }
+
+  fn toggle_key(&self) -> Option<ToggleKey> {
+    // TODO: test
+    match self
+      .parsed
+      .toggle_key
+      .as_deref()
+      .map(|key| key.to_lowercase())
+      .as_deref()
+    {
+      Some("ctrl") => Some(ToggleKey::Ctrl),
+      Some("alt") => Some(ToggleKey::Alt),
+      Some("shift") => Some(ToggleKey::Shift),
+      Some("meta") | Some("cmd") => Some(ToggleKey::Meta),
+      Some("right_ctrl") => Some(ToggleKey::RightCtrl),
+      Some("right_alt") => Some(ToggleKey::RightAlt),
+      Some("right_shift") => Some(ToggleKey::RightShift),
+      Some("right_meta") | Some("right_cmd")=> Some(ToggleKey::RightMeta),
+      Some("left_ctrl") => Some(ToggleKey::LeftCtrl),
+      Some("left_alt") => Some(ToggleKey::LeftAlt),
+      Some("left_shift") => Some(ToggleKey::LeftShift),
+      Some("left_meta") | Some("left_cmd") => Some(ToggleKey::LeftMeta),
+      Some("off") => None,
+      None => Some(ToggleKey::Alt),
+      err => {
+        error!("invalid toggle_key specified {:?}, falling back to ALT", err);
+        Some(ToggleKey::Alt)
+      }
+    }
+  }
 }
 
 impl ResolvedConfig {
@@ -213,6 +245,7 @@ impl ResolvedConfig {
       backend,
       clipboard_threshold,
       pre_paste_delay,
+      toggle_key,
       includes,
       excludes,
       extra_includes,

espanso-config/src/legacy/mod.rs

@@ -260,6 +260,26 @@ impl Config for LegacyInteropConfig {
   fn pre_paste_delay(&self) -> usize {
     crate::config::default::DEFAULT_PRE_PASTE_DELAY
   }
+
+  fn toggle_key(&self) -> Option<crate::config::ToggleKey> {
+    match self.config.toggle_key {
+      model::KeyModifier::CTRL => Some(crate::config::ToggleKey::Ctrl),
+      model::KeyModifier::SHIFT => Some(crate::config::ToggleKey::Shift),
+      model::KeyModifier::ALT => Some(crate::config::ToggleKey::Alt),
+      model::KeyModifier::META => Some(crate::config::ToggleKey::Meta), 
+      model::KeyModifier::BACKSPACE => None,
+      model::KeyModifier::OFF => None, 
+      model::KeyModifier::LEFT_CTRL => Some(crate::config::ToggleKey::LeftCtrl),
+      model::KeyModifier::RIGHT_CTRL => Some(crate::config::ToggleKey::RightCtrl),
+      model::KeyModifier::LEFT_ALT => Some(crate::config::ToggleKey::LeftAlt),
+      model::KeyModifier::RIGHT_ALT => Some(crate::config::ToggleKey::RightAlt),
+      model::KeyModifier::LEFT_META => Some(crate::config::ToggleKey::LeftMeta),
+      model::KeyModifier::RIGHT_META => Some(crate::config::ToggleKey::RightMeta),
+      model::KeyModifier::LEFT_SHIFT => Some(crate::config::ToggleKey::LeftShift),
+      model::KeyModifier::RIGHT_SHIFT => Some(crate::config::ToggleKey::RightShift),
+      model::KeyModifier::CAPS_LOCK => None
+    }
+  }
 }
 
 struct LegacyMatchGroup {