breadsearch: add --screenshot CLI mode for automated capture

Same pattern as breadbox/breadclip: one view ("search"), full known-size
canvas capture since the search panel isn't its own layer surface. Also
fixes the same PID-file-toggle footgun — a screenshot run now skips
toggle_or_continue() entirely instead of killing whatever real instance
holds breadsearch.pid.

Cargo.lock

@@ -51,12 +51,56 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "anstream"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
 [[package]]
 name = "anstyle"
 version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
 
+[[package]]
+name = "anstyle-parse"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
+dependencies = [
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.103"
@@ -141,7 +185,7 @@ version = "0.3.0"
 source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?tag=v0.3.0#8e82d2d833e992ce939a5b836f910ee109f2e939"
 dependencies = [
  "anyhow",
- "bread-utils",
+ "bread-utils 0.3.0",
  "hex",
  "ort",
  "sha2 0.10.9",
@@ -150,6 +194,16 @@ dependencies = [
  "ureq 2.12.1",
 ]
 
+[[package]]
+name = "bread-screenshots"
+version = "0.3.1"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#1a3475bd2358202f60e29c9bd27d06b1428b1a27"
+dependencies = [
+ "anyhow",
+ "bread-utils 0.3.1",
+ "tracing",
+]
+
 [[package]]
 name = "bread-theme"
 version = "0.2.3"
@@ -171,6 +225,16 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "bread-utils"
+version = "0.3.1"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?branch=dev#1a3475bd2358202f60e29c9bd27d06b1428b1a27"
+dependencies = [
+ "dirs",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "breadmill"
 version = "0.3.0"
@@ -198,8 +262,11 @@ dependencies = [
 name = "breadsearch"
 version = "0.3.0"
 dependencies = [
+ "anyhow",
+ "bread-screenshots",
  "bread-theme",
  "breadsearch-shared",
+ "clap",
  "gtk4",
  "gtk4-layer-shell",
  "serde_json",
@@ -364,6 +431,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd059f9da4f5c36b3787f65d38ccaab1cc315f07b01f89abc8359ee6a8205011"
 dependencies = [
  "clap_builder",
+ "clap_derive",
 ]
 
 [[package]]
@@ -372,11 +440,24 @@ version = "4.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f09628afdcc538b57f3c6341e9c8e9970f18e4a481690a64974d7023bd33548b"
 dependencies = [
+ "anstream",
  "anstyle",
  "clap_lex",
  "strsim",
 ]
 
+[[package]]
+name = "clap_derive"
+version = "4.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2ce8604710f6733aa641a2b3731eaa1e8b3d9973d5e3565da11800813f997a9"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "clap_lex"
 version = "1.1.0"
@@ -394,6 +475,12 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "colorchoice"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+
 [[package]]
 name = "compact_str"
 version = "0.9.1"
@@ -1612,6 +1699,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
+
 [[package]]
 name = "itertools"
 version = "0.14.0"
@@ -2034,6 +2127,12 @@ version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
+[[package]]
+name = "once_cell_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
+
 [[package]]
 name = "onig"
 version = "6.5.3"
@@ -3313,6 +3412,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
 
+[[package]]
+name = "utf8parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
+
 [[package]]
 name = "valuable"
 version = "0.1.1"

breadsearch/Cargo.toml

@@ -11,6 +11,10 @@ path = "src/main.rs"
 [dependencies]
 breadsearch-shared = { path = "../breadsearch-shared" }
 bread-theme = { git = "https://github.com/Breadway/bread-ecosystem", tag = "v0.2.10", features = ["gtk"] }
+# Capture primitives for `--screenshot` mode — see src/screenshot.rs.
+bread-screenshots = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", branch = "dev" }
 gtk4 = { version = "0.11", features = ["v4_12"] }
 gtk4-layer-shell = "0.8"
 serde_json = "1"
+clap = { version = "4", features = ["derive"] }
+anyhow = "1"

breadsearch/src/main.rs

@@ -18,6 +18,8 @@ use gtk4::{
 };
 use gtk4_layer_shell::{Edge, KeyboardMode, Layer, LayerShell};
 
+mod screenshot;
+
 // ---- Theming ----------------------------------------------------------------
 
 fn build_css(p: &Palette) -> String {
@@ -208,10 +210,17 @@ fn open_folder(path: &str) {
 
 // ---- UI ---------------------------------------------------------------------
 
-fn run_ui() {
+fn run_ui(screenshot_req: Option<screenshot::ScreenshotRequest>) {
-    let app = Application::builder()
+    let mut builder = Application::builder().application_id("com.breadway.breadsearch");
-        .application_id("com.breadway.breadsearch")
+    if screenshot_req.is_some() {
-        .build();
+        // GApplication is single-instance by default; this machine typically
+        // already has a real breadsearch instance, so without this a
+        // screenshot run would just message the *existing* instance instead
+        // of starting a fresh one that ever sees `screenshot_req`.
+        builder = builder.flags(gtk4::gio::ApplicationFlags::NON_UNIQUE);
+    }
+    let app = builder.build();
+    let is_screenshot_run = screenshot_req.is_some();
 
     let debounce_id: Rc<RefCell<Option<glib::SourceId>>> = Rc::new(RefCell::new(None));
 
@@ -419,18 +428,37 @@ fn run_ui() {
         window.add_controller(outside_click);
 
         window.connect_destroy(|_| cleanup_pid());
+
+        if let Some(req) = screenshot_req.clone() {
+            screenshot::dispatch(&window, req);
+        }
+
         window.present();
         search.grab_focus();
     });
 
-    app.run();
+    if is_screenshot_run {
+        // GLib's own option parser otherwise rejects --screenshot/--output
+        // before clap ever sees them (`Cli::parse()` already ran in `main`,
+        // over the real argv).
+        app.run_with_args(&[] as &[&str]);
+    } else {
+        app.run();
+    }
 }
 
 // ---- Main -------------------------------------------------------------------
 
 fn main() {
-    if !toggle_or_continue() {
+    use clap::Parser;
+    let cli = screenshot::Cli::parse();
+    let screenshot_req = cli.screenshot_request();
+
+    // The PID-file toggle kills whatever's holding the file — a real,
+    // already-running breadsearch instance included. A screenshot run must
+    // never touch it: it's a separate, disposable instance by design.
+    if screenshot_req.is_none() && !toggle_or_continue() {
         return;
     }
-    run_ui();
+    run_ui(screenshot_req);
 }

breadsearch/src/screenshot.rs

@@ -0,0 +1,94 @@
+//! `--screenshot` CLI mode: render breadsearch's search panel, capture it
+//! via `bread-screenshots`, then exit — driven by `bread-ecosystem`'s
+//! `bread-capture` orchestrator, or run standalone for one-off captures.
+//!
+//! Same reasoning as breadbox: one view ("search"), full known-size canvas
+//! capture since the panel isn't its own layer surface. Captures whatever
+//! the panel shows at settle time — normally the "Type to search…" empty
+//! state, since there's no query to type in an automated run.
+
+use clap::Parser;
+use gtk4::prelude::*;
+use std::path::PathBuf;
+use std::time::Duration;
+
+/// Extra settle time after `map` for the first frame to actually paint
+/// before grim runs — `map` fires once the surface exists, not once
+/// anything has been drawn into it.
+const SETTLE_DELAY: Duration = Duration::from_millis(300);
+
+#[derive(Parser)]
+#[command(name = "breadsearch")]
+pub struct Cli {
+    /// Render the named view, capture it, then exit instead of running
+    /// normally. Known views: "search".
+    #[arg(long)]
+    pub screenshot: Option<String>,
+
+    /// PNG path to write the capture to. Required together with --screenshot.
+    #[arg(long)]
+    pub output: Option<PathBuf>,
+
+    /// Capture canvas width — matches the isolated compositor's output width
+    /// (`bread-capture --isolate-width`).
+    #[arg(long, default_value_t = 1920)]
+    pub width: u32,
+
+    /// Capture canvas height — see `width`.
+    #[arg(long, default_value_t = 1080)]
+    pub height: u32,
+}
+
+#[derive(Clone)]
+pub struct ScreenshotRequest {
+    pub view: String,
+    pub output: PathBuf,
+    pub width: u32,
+    pub height: u32,
+}
+
+impl Cli {
+    /// `None` for a normal run. Exits the process with an error if
+    /// `--screenshot` was given without `--output`, before any GTK setup
+    /// happens.
+    pub fn screenshot_request(&self) -> Option<ScreenshotRequest> {
+        let view = self.screenshot.clone()?;
+        let Some(output) = self.output.clone() else {
+            eprintln!("breadsearch: --screenshot requires --output");
+            std::process::exit(1);
+        };
+        Some(ScreenshotRequest { view, output, width: self.width, height: self.height })
+    }
+}
+
+/// Wire up the given view's screenshot sequence against an already-built,
+/// not-yet-presented window. Every path here ends by exiting the process —
+/// it never returns control to the normal search UI.
+pub fn dispatch(window: &gtk4::ApplicationWindow, req: ScreenshotRequest) {
+    match req.view.as_str() {
+        "search" => {
+            let output = req.output;
+            let (width, height) = (req.width as i32, req.height as i32);
+            window.connect_map(move |_| {
+                let output = output.clone();
+                gtk4::glib::timeout_add_local_once(SETTLE_DELAY, move || {
+                    finish(bread_screenshots::capture_region(0, 0, width, height, &output));
+                });
+            });
+        }
+        other => {
+            eprintln!("breadsearch: unknown screenshot view '{other}' (known: search)");
+            std::process::exit(1);
+        }
+    }
+}
+
+fn finish(result: anyhow::Result<()>) {
+    match result {
+        Ok(()) => std::process::exit(0),
+        Err(e) => {
+            eprintln!("breadsearch: screenshot capture failed: {e}");
+            std::process::exit(1);
+        }
+    }
+}