feat(config): add backspace_limit option

espanso-config/src/config/mod.rs

@@ -95,6 +95,11 @@ pub trait Config: Send {
   // Examples of this are . or ,
   fn word_separators(&self) -> Vec<String>;
 
+  // Maximum number of backspace presses espanso keeps track of.
+  // For example, this is needed to correctly expand even if typos
+  // are typed.
+  fn backspace_limit(&self) -> usize;
+
   fn is_match<'a>(&self, app: &AppProperties<'a>) -> bool;
 }
 

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

@@ -35,6 +35,7 @@ pub(crate) struct ParsedConfig {
   pub paste_shortcut: Option<String>,
   pub disable_x11_fast_inject: Option<bool>,
   pub word_separators: Option<Vec<String>>,
+  pub backspace_limit: Option<usize>,
 
   pub pre_paste_delay: Option<usize>,
   pub restore_clipboard_delay: Option<usize>,

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

@@ -72,6 +72,9 @@ pub(crate) struct YAMLConfig {
   #[serde(default)]
   pub word_separators: Option<Vec<String>>,
 
+  #[serde(default)]
+  pub backspace_limit: Option<usize>,
+
   // Include/Exclude
   #[serde(default)]
   pub includes: Option<Vec<String>>,
@@ -131,6 +134,7 @@ impl TryFrom<YAMLConfig> for ParsedConfig {
       inject_delay: yaml_config.inject_delay,
       key_delay: yaml_config.key_delay.or(yaml_config.backspace_delay),
       word_separators: yaml_config.word_separators,
+      backspace_limit: yaml_config.backspace_limit,
 
       pre_paste_delay: yaml_config.pre_paste_delay,
       restore_clipboard_delay: yaml_config.restore_clipboard_delay,
@@ -174,6 +178,7 @@ mod tests {
     key_delay: 20
     backspace_delay: 30
     word_separators: ["'", "."]
+    backspace_limit: 10
       
     use_standard_includes: true
     includes: ["test1"]
@@ -205,6 +210,7 @@ mod tests {
         disable_x11_fast_inject: Some(true),
         inject_delay: Some(10),
         key_delay: Some(20),
+        backspace_limit: Some(10),
 
         pre_paste_delay: Some(300),
         

espanso-config/src/config/resolve.rs

@@ -243,6 +243,10 @@ impl Config for ResolvedConfig {
       (22u8 as char).to_string(),
     ])
   }
+
+  fn backspace_limit(&self) -> usize {
+    self.parsed.backspace_limit.unwrap_or(5)
+  }
 }
 
 impl ResolvedConfig {
@@ -312,6 +316,7 @@ impl ResolvedConfig {
       inject_delay,
       key_delay,
       word_separators,
+      backspace_limit,
       includes,
       excludes,
       extra_includes,

espanso-config/src/legacy/mod.rs

@@ -331,6 +331,10 @@ impl Config for LegacyInteropConfig {
   fn word_separators(&self) -> Vec<String> {
     self.config.word_separators.iter().map(|c| String::from(*c)).collect()
   }
+
+  fn backspace_limit(&self) -> usize {
+    self.config.backspace_limit.try_into().unwrap()
+  }
 }
 
 struct LegacyMatchGroup {