T19 Git: diffs unified and split with word marks and folds, three-way merge and conflict resolver, changes list and commit input, commit graph and list, branch selector, branch, tag and stash lists, blame with annotation, file history, pull request card, review thread, diff stat and status badge

src/git/history.rs

@@ -0,0 +1,142 @@
+use std::rc::Rc;
+
+use gpui::{
+    App, ElementId, InteractiveElement, IntoElement, ParentElement, RenderOnce, SharedString,
+    StatefulInteractiveElement, Styled, Window, div, prelude::*,
+};
+
+use super::{badges::DiffStat, commits::Commit};
+use crate::{
+    theme::{ActiveTheme, Radius, TextSize},
+    typography::Ellipsis,
+};
+
+type OnPick = Rc<dyn Fn(&SharedString, &mut Window, &mut App)>;
+
+/// A file's commits newest first on a line through them: subject, author and when, and what each changed; a press picks one.
+#[derive(IntoElement)]
+pub struct FileHistory {
+    id: ElementId,
+    commits: Vec<(Commit, (usize, usize))>,
+    selected: Option<SharedString>,
+    on_pick: Option<OnPick>,
+}
+
+impl FileHistory {
+    /// Each commit with the lines it added and removed in the file.
+    pub fn new(
+        id: impl Into<ElementId>,
+        commits: impl IntoIterator<Item = (Commit, (usize, usize))>,
+    ) -> Self {
+        Self {
+            id: id.into(),
+            commits: commits.into_iter().collect(),
+            selected: None,
+            on_pick: None,
+        }
+    }
+
+    pub fn selected(mut self, id: impl Into<SharedString>) -> Self {
+        self.selected = Some(id.into());
+        self
+    }
+
+    pub fn on_pick(
+        mut self,
+        handler: impl Fn(&SharedString, &mut Window, &mut App) + 'static,
+    ) -> Self {
+        self.on_pick = Some(Rc::new(handler));
+        self
+    }
+}
+
+impl RenderOnce for FileHistory {
+    fn render(self, _: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let colors = theme.colors.clone();
+        let last = self.commits.len().saturating_sub(1);
+        div()
+            .flex()
+            .flex_col()
+            .text_size(theme.text_size(TextSize::Sm))
+            .children(self.commits.into_iter().enumerate().map(
+                |(ix, (commit, (added, removed)))| {
+                    let selected = self.selected.as_ref() == Some(&commit.id);
+                    let (pick, id) = (self.on_pick.clone(), commit.id.clone());
+                    let short: String = commit.id.chars().take(7).collect();
+                    div()
+                        .id((self.id.clone(), format!("commit-{ix}")))
+                        .flex()
+                        .gap_3()
+                        .px_2()
+                        .rounded(theme.radius(Radius::Sm))
+                        .when(selected, |row| row.bg(colors.active))
+                        .when(!selected, |row| row.hover(|row| row.bg(colors.hover)))
+                        .when_some(pick, |row, pick| {
+                            row.cursor_pointer()
+                                .on_click(move |_, window, cx| pick(&id, window, cx))
+                        })
+                        .child(
+                            div()
+                                .flex_none()
+                                .flex()
+                                .flex_col()
+                                .items_center()
+                                .child(div().w_0().h_2().when(ix > 0, |line| {
+                                    line.border_l_1().border_color(colors.border)
+                                }))
+                                .child(
+                                    div()
+                                        .size_2()
+                                        .rounded_full()
+                                        .border_1()
+                                        .border_color(if selected {
+                                            colors.focus
+                                        } else {
+                                            colors.border_strong
+                                        })
+                                        .bg(if ix == 0 { colors.focus } else { colors.bg }),
+                                )
+                                .child(div().w_0().flex_1().when(ix < last, |line| {
+                                    line.border_l_1().border_color(colors.border)
+                                })),
+                        )
+                        .child(
+                            div()
+                                .flex_1()
+                                .min_w_0()
+                                .py_1p5()
+                                .flex()
+                                .flex_col()
+                                .gap_0p5()
+                                .child(
+                                    div()
+                                        .text_color(colors.fg)
+                                        .child(Ellipsis::new(commit.subject.clone())),
+                                )
+                                .child(
+                                    div()
+                                        .flex()
+                                        .items_center()
+                                        .gap_2()
+                                        .text_size(theme.text_size(TextSize::Xs))
+                                        .text_color(colors.fg_subtle)
+                                        .child(commit.author.clone())
+                                        .child(commit.when.clone())
+                                        .child(
+                                            div()
+                                                .font_family(theme.mono_family.clone())
+                                                .child(short),
+                                        ),
+                                ),
+                        )
+                        .child(
+                            div()
+                                .flex_none()
+                                .py_1p5()
+                                .child(DiffStat::new(added, removed)),
+                        )
+                },
+            ))
+    }
+}