enable smart case regex search by default

TODO.md

@@ -22,8 +22,6 @@ as you type completion!
 
 - [ ] lsp: signature help
 
-- [ ] search: smart case by default: insensitive unless upper detected
-
 2
 - [ ] macro recording
 - [ ] extend selection (treesitter select parent node) (replaces viw, vi(, va( etc )

book/src/keymap.md

@@ -104,8 +104,7 @@
 
 ### Search
 
-> TODO: The search implementation isn't ideal yet -- we don't support searching
-in reverse, or searching via smartcase.
+> TODO: The search implementation isn't ideal yet -- we don't support searching in reverse.
 
 | Key   | Description                                 | Command              |
 | ----- | -----------                                 | -------              |

helix-term/src/commands.rs

@@ -5,7 +5,7 @@ use helix_core::{
     match_brackets,
     movement::{self, Direction},
     object, pos_at_coords,
-    regex::{self, Regex},
+    regex::{self, Regex, RegexBuilder},
     register::Register,
     search, selection, surround, textobject, LineEnding, Position, Range, Rope, RopeGraphemes,
     RopeSlice, Selection, SmallVec, Tendril, Transaction,
@@ -1154,7 +1154,8 @@ fn search_next_impl(cx: &mut Context, extend: bool) {
     if let Some(query) = registers.read('/') {
         let query = query.last().unwrap();
         let contents = doc.text().slice(..).to_string();
-        let regex = Regex::new(query).unwrap();
+        let case_insensitive = if cx.editor.config.smart_case { !query.chars().any(char::is_uppercase) } else { false };
+        let regex = RegexBuilder::new(query).case_insensitive(case_insensitive).build().expect("unable to build regex");
         search_impl(doc, view, &contents, &regex, extend);
     }
 }

helix-term/src/ui/mod.rs

@@ -20,6 +20,7 @@ pub use spinner::{ProgressSpinners, Spinner};
 pub use text::Text;
 
 use helix_core::regex::Regex;
+use helix_core::regex::RegexBuilder;
 use helix_view::{Document, Editor, View};
 
 use std::path::PathBuf;
@@ -53,7 +54,9 @@ pub fn regex_prompt(
                         return;
                     }
 
-                    match Regex::new(input) {
+                    let case_insensitive = if cx.editor.config.smart_case { !input.chars().any(char::is_uppercase) } else { false };
+
+                    match RegexBuilder::new(input).case_insensitive(case_insensitive).build() {
                         Ok(regex) => {
                             let (view, doc) = current!(cx.editor);
 

helix-view/src/editor.rs

@@ -39,6 +39,8 @@ pub struct Config {
     pub line_number: LineNumber,
     /// Middle click paste support. Defaults to true
     pub middle_click_paste: bool,
+    /// Smart case: Case insensitive searching unless pattern contains upper case characters. Defaults to true.
+    pub smart_case: bool,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
@@ -64,6 +66,7 @@ impl Default for Config {
             },
             line_number: LineNumber::Absolute,
             middle_click_paste: true,
+            smart_case: true,
         }
     }
 }