Replace gix with configurable libgit2 diffs

src/app.rs

@@ -14,7 +14,9 @@ use preferences::PreferenceDraft;
 #[cfg(test)]
 use preferences::{parse_optional_gib, parse_streaming_cache};
 
-use crate::config::{Config, DevBrainConfig, EndpointConfig};
+use crate::config::{
+    Config, DevBrainConfig, EndpointConfig, GitConfig, GitDiffAlgorithm, GitDiffWhitespace,
+};
 use crate::database::{Database, ProjectWithSessions, SessionState, StoredMessage};
 #[cfg(target_os = "macos")]
 use crate::engine::ChatTurn;
@@ -248,6 +250,7 @@ pub(super) enum PreferenceSection {
     Model,
     Endpoint,
     DevBrain,
+    Git,
     Generation,
     Execution,
     Acceleration,
@@ -256,10 +259,11 @@ pub(super) enum PreferenceSection {
 }
 
 impl PreferenceSection {
-    const ALL: [Self; 8] = [
+    const ALL: [Self; 9] = [
         Self::Model,
         Self::Endpoint,
         Self::DevBrain,
+        Self::Git,
         Self::Generation,
         Self::Execution,
         Self::Acceleration,
@@ -272,6 +276,7 @@ impl PreferenceSection {
             Self::Model => "preferences-model",
             Self::Endpoint => "preferences-endpoint",
             Self::DevBrain => "preferences-dev-brain",
+            Self::Git => "preferences-git",
             Self::Generation => "preferences-generation",
             Self::Execution => "preferences-execution",
             Self::Acceleration => "preferences-acceleration",
@@ -285,6 +290,7 @@ impl PreferenceSection {
             Self::Model => "Model & lifecycle",
             Self::Endpoint => "Local endpoint",
             Self::DevBrain => "Dev Brain",
+            Self::Git => "Git diffs",
             Self::Generation => "Generation",
             Self::Execution => "Execution",
             Self::Acceleration => "Acceleration & memory",
@@ -344,6 +350,12 @@ pub(crate) enum Message {
     PreferenceEndpointCorsChanged(bool),
     PreferenceDevBrainEnabledChanged(bool),
     PreferenceDevBrainVaultChanged(String),
+    PreferenceGitDiffAlgorithmChanged(GitDiffAlgorithm),
+    PreferenceGitContextLinesChanged(String),
+    PreferenceGitInterhunkLinesChanged(String),
+    PreferenceGitIndentHeuristicChanged(bool),
+    PreferenceGitWhitespaceChanged(GitDiffWhitespace),
+    PreferenceGitIgnoreBlankLinesChanged(bool),
     ChooseDevBrainVault,
     DevBrainVaultPicked(Option<PathBuf>),
     PreferenceContextChanged(String),
@@ -1174,6 +1186,30 @@ impl App {
                 self.preference_draft.dev_brain_vault_path = value;
                 self.preference_error = None;
             }
+            Message::PreferenceGitDiffAlgorithmChanged(algorithm) => {
+                self.preference_draft.git_diff_algorithm = algorithm;
+                self.preference_error = None;
+            }
+            Message::PreferenceGitContextLinesChanged(value) => {
+                self.preference_draft.git_context_lines = value;
+                self.preference_error = None;
+            }
+            Message::PreferenceGitInterhunkLinesChanged(value) => {
+                self.preference_draft.git_interhunk_lines = value;
+                self.preference_error = None;
+            }
+            Message::PreferenceGitIndentHeuristicChanged(enabled) => {
+                self.preference_draft.git_indent_heuristic = enabled;
+                self.preference_error = None;
+            }
+            Message::PreferenceGitWhitespaceChanged(whitespace) => {
+                self.preference_draft.git_whitespace = whitespace;
+                self.preference_error = None;
+            }
+            Message::PreferenceGitIgnoreBlankLinesChanged(enabled) => {
+                self.preference_draft.git_ignore_blank_lines = enabled;
+                self.preference_error = None;
+            }
             Message::ChooseDevBrainVault => {
                 return Task::perform(
                     async {