Chores: Refactor approval Patch UI. Stack: [1/2] (#2049)

- Moved the logic for the apply patch in its own file

Stack:
#2050
-> #2049

codex-rs/tui/src/diff_render.rs

@@ -0,0 +1,152 @@
+use ratatui::style::Color;
+use ratatui::style::Modifier;
+use ratatui::style::Style;
+use ratatui::text::Line as RtLine;
+use ratatui::text::Span as RtSpan;
+use std::collections::HashMap;
+use std::path::PathBuf;
+
+use codex_core::protocol::FileChange;
+
+struct FileSummary {
+    display_path: String,
+    added: usize,
+    removed: usize,
+}
+
+pub(crate) fn create_diff_summary(
+    title: &str,
+    changes: HashMap<PathBuf, FileChange>,
+) -> Vec<RtLine<'static>> {
+    let mut files: Vec<FileSummary> = Vec::new();
+
+    // Count additions/deletions from a unified diff body
+    let count_from_unified = |diff: &str| -> (usize, usize) {
+        if let Ok(patch) = diffy::Patch::from_str(diff) {
+            let mut adds = 0usize;
+            let mut dels = 0usize;
+            for hunk in patch.hunks() {
+                for line in hunk.lines() {
+                    match line {
+                        diffy::Line::Insert(_) => adds += 1,
+                        diffy::Line::Delete(_) => dels += 1,
+                        _ => {}
+                    }
+                }
+            }
+            (adds, dels)
+        } else {
+            let mut adds = 0usize;
+            let mut dels = 0usize;
+            for l in diff.lines() {
+                if l.starts_with("+++") || l.starts_with("---") || l.starts_with("@@") {
+                    continue;
+                }
+                match l.as_bytes().first() {
+                    Some(b'+') => adds += 1,
+                    Some(b'-') => dels += 1,
+                    _ => {}
+                }
+            }
+            (adds, dels)
+        }
+    };
+
+    for (path, change) in &changes {
+        use codex_core::protocol::FileChange::*;
+        match change {
+            Add { content } => {
+                let added = content.lines().count();
+                files.push(FileSummary {
+                    display_path: path.display().to_string(),
+                    added,
+                    removed: 0,
+                });
+            }
+            Delete => {
+                let removed = std::fs::read_to_string(path)
+                    .ok()
+                    .map(|s| s.lines().count())
+                    .unwrap_or(0);
+                files.push(FileSummary {
+                    display_path: path.display().to_string(),
+                    added: 0,
+                    removed,
+                });
+            }
+            Update {
+                unified_diff,
+                move_path,
+            } => {
+                let (added, removed) = count_from_unified(unified_diff);
+                let display_path = if let Some(new_path) = move_path {
+                    format!("{} → {}", path.display(), new_path.display())
+                } else {
+                    path.display().to_string()
+                };
+                files.push(FileSummary {
+                    display_path,
+                    added,
+                    removed,
+                });
+            }
+        }
+    }
+
+    let file_count = files.len();
+    let total_added: usize = files.iter().map(|f| f.added).sum();
+    let total_removed: usize = files.iter().map(|f| f.removed).sum();
+    let noun = if file_count == 1 { "file" } else { "files" };
+
+    let mut out: Vec<RtLine<'static>> = Vec::new();
+
+    // Header
+    let mut header_spans: Vec<RtSpan<'static>> = Vec::new();
+    header_spans.push(RtSpan::styled(
+        title.to_owned(),
+        Style::default()
+            .fg(Color::Magenta)
+            .add_modifier(Modifier::BOLD),
+    ));
+    header_spans.push(RtSpan::raw(" to "));
+    header_spans.push(RtSpan::raw(format!("{file_count} {noun} ")));
+    header_spans.push(RtSpan::raw("("));
+    header_spans.push(RtSpan::styled(
+        format!("+{total_added}"),
+        Style::default().fg(Color::Green),
+    ));
+    header_spans.push(RtSpan::raw(" "));
+    header_spans.push(RtSpan::styled(
+        format!("-{total_removed}"),
+        Style::default().fg(Color::Red),
+    ));
+    header_spans.push(RtSpan::raw(")"));
+    out.push(RtLine::from(header_spans));
+
+    // Dimmed per-file lines with prefix
+    for (idx, f) in files.iter().enumerate() {
+        let mut spans: Vec<RtSpan<'static>> = Vec::new();
+        spans.push(RtSpan::raw(f.display_path.clone()));
+        spans.push(RtSpan::raw(" ("));
+        spans.push(RtSpan::styled(
+            format!("+{}", f.added),
+            Style::default().fg(Color::Green),
+        ));
+        spans.push(RtSpan::raw(" "));
+        spans.push(RtSpan::styled(
+            format!("-{}", f.removed),
+            Style::default().fg(Color::Red),
+        ));
+        spans.push(RtSpan::raw(")"));
+
+        let mut line = RtLine::from(spans);
+        let prefix = if idx == 0 { "  ⎿ " } else { "    " };
+        line.spans.insert(0, prefix.into());
+        line.spans.iter_mut().for_each(|span| {
+            span.style = span.style.add_modifier(Modifier::DIM);
+        });
+        out.push(line);
+    }
+
+    out
+}

codex-rs/tui/src/history_cell.rs

@@ -1,4 +1,5 @@
 use crate::colors::LIGHT_BLUE;
+use crate::diff_render::create_diff_summary;
 use crate::exec_command::relativize_to_home;
 use crate::exec_command::strip_bash_lc_and_escape;
 use crate::slash_command::SlashCommand;
@@ -28,8 +29,6 @@ use ratatui::prelude::*;
 use ratatui::style::Color;
 use ratatui::style::Modifier;
 use ratatui::style::Style;
-use ratatui::text::Line as RtLine;
-use ratatui::text::Span as RtSpan;
 use ratatui::widgets::Paragraph;
 use ratatui::widgets::WidgetRef;
 use ratatui::widgets::Wrap;
@@ -45,12 +44,6 @@ pub(crate) struct CommandOutput {
     pub(crate) stderr: String,
 }
 
-struct FileSummary {
-    display_path: String,
-    added: usize,
-    removed: usize,
-}
-
 pub(crate) enum PatchEventType {
     ApprovalRequest,
     ApplyBegin { auto_approved: bool },
@@ -803,7 +796,7 @@ impl HistoryCell {
         event_type: PatchEventType,
         changes: HashMap<PathBuf, FileChange>,
     ) -> Self {
-        let title = match event_type {
+        let title = match &event_type {
             PatchEventType::ApprovalRequest => "proposed patch",
             PatchEventType::ApplyBegin {
                 auto_approved: true,
@@ -821,15 +814,7 @@ impl HistoryCell {
             }
         };
 
-        let summary_lines = create_diff_summary(title, changes);
-
-        let mut lines: Vec<Line<'static>> = Vec::new();
-
-        for line in summary_lines {
-            lines.push(line);
-        }
-
-        lines.push(Line::from(""));
+        let lines: Vec<Line<'static>> = create_diff_summary(title, changes);
 
         HistoryCell::PendingPatch {
             view: TextBlock::new(lines),
@@ -931,140 +916,6 @@ fn output_lines(
     out
 }
 
-fn create_diff_summary(title: &str, changes: HashMap<PathBuf, FileChange>) -> Vec<RtLine<'static>> {
-    let mut files: Vec<FileSummary> = Vec::new();
-
-    // Count additions/deletions from a unified diff body
-    let count_from_unified = |diff: &str| -> (usize, usize) {
-        if let Ok(patch) = diffy::Patch::from_str(diff) {
-            let mut adds = 0usize;
-            let mut dels = 0usize;
-            for hunk in patch.hunks() {
-                for line in hunk.lines() {
-                    match line {
-                        diffy::Line::Insert(_) => adds += 1,
-                        diffy::Line::Delete(_) => dels += 1,
-                        _ => {}
-                    }
-                }
-            }
-            (adds, dels)
-        } else {
-            let mut adds = 0usize;
-            let mut dels = 0usize;
-            for l in diff.lines() {
-                if l.starts_with("+++") || l.starts_with("---") || l.starts_with("@@") {
-                    continue;
-                }
-                match l.as_bytes().first() {
-                    Some(b'+') => adds += 1,
-                    Some(b'-') => dels += 1,
-                    _ => {}
-                }
-            }
-            (adds, dels)
-        }
-    };
-
-    for (path, change) in &changes {
-        use codex_core::protocol::FileChange::*;
-        match change {
-            Add { content } => {
-                let added = content.lines().count();
-                files.push(FileSummary {
-                    display_path: path.display().to_string(),
-                    added,
-                    removed: 0,
-                });
-            }
-            Delete => {
-                let removed = std::fs::read_to_string(path)
-                    .ok()
-                    .map(|s| s.lines().count())
-                    .unwrap_or(0);
-                files.push(FileSummary {
-                    display_path: path.display().to_string(),
-                    added: 0,
-                    removed,
-                });
-            }
-            Update {
-                unified_diff,
-                move_path,
-            } => {
-                let (added, removed) = count_from_unified(unified_diff);
-                let display_path = if let Some(new_path) = move_path {
-                    format!("{} → {}", path.display(), new_path.display())
-                } else {
-                    path.display().to_string()
-                };
-                files.push(FileSummary {
-                    display_path,
-                    added,
-                    removed,
-                });
-            }
-        }
-    }
-
-    let file_count = files.len();
-    let total_added: usize = files.iter().map(|f| f.added).sum();
-    let total_removed: usize = files.iter().map(|f| f.removed).sum();
-    let noun = if file_count == 1 { "file" } else { "files" };
-
-    let mut out: Vec<RtLine<'static>> = Vec::new();
-
-    // Header
-    let mut header_spans: Vec<RtSpan<'static>> = Vec::new();
-    header_spans.push(RtSpan::styled(
-        title.to_owned(),
-        Style::default()
-            .fg(Color::Magenta)
-            .add_modifier(Modifier::BOLD),
-    ));
-    header_spans.push(RtSpan::raw(" to "));
-    header_spans.push(RtSpan::raw(format!("{file_count} {noun} ")));
-    header_spans.push(RtSpan::raw("("));
-    header_spans.push(RtSpan::styled(
-        format!("+{total_added}"),
-        Style::default().fg(Color::Green),
-    ));
-    header_spans.push(RtSpan::raw(" "));
-    header_spans.push(RtSpan::styled(
-        format!("-{total_removed}"),
-        Style::default().fg(Color::Red),
-    ));
-    header_spans.push(RtSpan::raw(")"));
-    out.push(RtLine::from(header_spans));
-
-    // Dimmed per-file lines with prefix
-    for (idx, f) in files.iter().enumerate() {
-        let mut spans: Vec<RtSpan<'static>> = Vec::new();
-        spans.push(RtSpan::raw(f.display_path.clone()));
-        spans.push(RtSpan::raw(" ("));
-        spans.push(RtSpan::styled(
-            format!("+{}", f.added),
-            Style::default().fg(Color::Green),
-        ));
-        spans.push(RtSpan::raw(" "));
-        spans.push(RtSpan::styled(
-            format!("-{}", f.removed),
-            Style::default().fg(Color::Red),
-        ));
-        spans.push(RtSpan::raw(")"));
-
-        let mut line = RtLine::from(spans);
-        let prefix = if idx == 0 { "  ⎿ " } else { "    " };
-        line.spans.insert(0, prefix.into());
-        line.spans.iter_mut().for_each(|span| {
-            span.style = span.style.add_modifier(Modifier::DIM);
-        });
-        out.push(line);
-    }
-
-    out
-}
-
 fn format_mcp_invocation<'a>(invocation: McpInvocation) -> Line<'a> {
     let args_str = invocation
         .arguments

codex-rs/tui/src/lib.rs

@@ -31,6 +31,7 @@ mod citation_regex;
 mod cli;
 mod colors;
 pub mod custom_terminal;
+mod diff_render;
 mod exec_command;
 mod file_search;
 mod get_git_diff;