Make screenshot path configurable

resources/default-config.kdl

@@ -110,6 +110,13 @@ preset-column-widths {
 // Set gaps around windows in logical pixels.
 gaps 16
 
+// You can change the path where screenshots are saved.
+// A ~ at the front will be expanded to the home directory.
+screenshot-path "~/Pictures/Screenshots"
+
+// You can also set this to null to disable saving screenshots to disk.
+// screenshot-path null
+
 binds {
     // Keys consist of modifiers separated by + signs, followed by an XKB key name
     // in the end. To find an XKB name for a particular key, you may use a program

src/config.rs

@@ -26,6 +26,8 @@ pub struct Config {
     pub preset_column_widths: Vec<PresetWidth>,
     #[knuffel(child, unwrap(argument), default = 16)]
     pub gaps: u16,
+    #[knuffel(child, unwrap(argument), default = Some(PathBuf::from("~/Pictures/Screenshots")))]
+    pub screenshot_path: Option<PathBuf>,
     #[knuffel(child, default)]
     pub binds: Binds,
     #[knuffel(child, default)]
@@ -539,6 +541,8 @@ mod tests {
 
             gaps 8
 
+            screenshot-path "~/Screenshots"
+
             binds {
                 Mod+T { spawn "alacritty"; }
                 Mod+Q { close-window; }
@@ -613,6 +617,7 @@ mod tests {
                     PresetWidth::Fixed(1280),
                 ],
                 gaps: 8,
+                screenshot_path: Some(PathBuf::from("~/Screenshots")),
                 binds: Binds(vec![
                     Bind {
                         key: Key {

src/niri.rs

@@ -2009,8 +2009,13 @@ impl Niri {
         size: Size<i32, Physical>,
         pixels: Vec<u8>,
     ) -> anyhow::Result<()> {
-        let path = make_screenshot_path().context("error making screenshot path")?;
-        debug!("saving screenshot to {path:?}");
+        let path = match make_screenshot_path(&self.config.borrow()) {
+            Ok(path) => path,
+            Err(err) => {
+                warn!("error making screenshot path: {err:?}");
+                None
+            }
+        };
 
         // Prepare to set the encoded image as our clipboard selection. This must be done from the
         // main thread.
@@ -2048,8 +2053,13 @@ impl Niri {
             let buf: Arc<[u8]> = Arc::from(buf.into_boxed_slice());
             let _ = tx.send(buf.clone());
 
-            if let Err(err) = std::fs::write(path, buf) {
-                warn!("error saving screenshot image: {err:?}");
+            if let Some(path) = path {
+                debug!("saving screenshot to {path:?}");
+                if let Err(err) = std::fs::write(path, buf) {
+                    warn!("error saving screenshot image: {err:?}");
+                }
+            } else {
+                debug!("not saving screenshot to disk");
             }
         });
 
@@ -2067,6 +2077,8 @@ impl Niri {
 
         use smithay::backend::renderer::element::utils::{Relocate, RelocateRenderElement};
 
+        use crate::utils::add_screenshot_filename;
+
         let _span = tracy_client::span!("Niri::screenshot_all_outputs");
 
         let mut elements = vec![];
@@ -2090,7 +2102,16 @@ impl Niri {
         // FIXME: scale.
         let pixels = render_to_vec(renderer, size, Scale::from(1.), Fourcc::Abgr8888, &elements)?;
 
-        let path = make_screenshot_path().context("error making screenshot path")?;
+        let path = make_screenshot_path(&self.config.borrow())
+            .and_then(|path| match path {
+                Some(path) => Ok(path),
+                None => {
+                    let mut path = env::temp_dir();
+                    add_screenshot_filename(&mut path)?;
+                    Ok(path)
+                }
+            })
+            .context("error making screenshot path")?;
         debug!("saving screenshot to {path:?}");
 
         thread::spawn(move || {

src/utils.rs

@@ -12,6 +12,8 @@ use directories::UserDirs;
 use smithay::reexports::rustix::time::{clock_gettime, ClockId};
 use smithay::utils::{Logical, Point, Rectangle};
 
+use crate::config::Config;
+
 pub fn get_monotonic_time() -> Duration {
     let ts = clock_gettime(ClockId::Monotonic);
     Duration::new(ts.tv_sec as u64, ts.tv_nsec as u32)
@@ -21,15 +23,22 @@ pub fn center(rect: Rectangle<i32, Logical>) -> Point<i32, Logical> {
     rect.loc + rect.size.downscale(2).to_point()
 }
 
-pub fn make_screenshot_path() -> anyhow::Result<PathBuf> {
-    let dirs = UserDirs::new().context("error retrieving home directory")?;
-    let mut path = dirs.picture_dir().map(|p| p.to_owned()).unwrap_or_else(|| {
-        let mut dir = dirs.home_dir().to_owned();
-        dir.push("Pictures");
-        dir
-    });
-    path.push("Screenshots");
+pub fn make_screenshot_path(config: &Config) -> anyhow::Result<Option<PathBuf>> {
+    let Some(mut path) = config.screenshot_path.clone() else {
+        return Ok(None);
+    };
 
+    if let Ok(rest) = path.strip_prefix("~") {
+        let dirs = UserDirs::new().context("error retrieving home directory")?;
+        path = [dirs.home_dir(), rest].iter().collect();
+    }
+
+    add_screenshot_filename(&mut path)?;
+
+    Ok(Some(path))
+}
+
+pub fn add_screenshot_filename(path: &mut PathBuf) -> anyhow::Result<()> {
     let mut buf = [0u8; 256];
     let name;
     unsafe {
@@ -53,7 +62,7 @@ pub fn make_screenshot_path() -> anyhow::Result<PathBuf> {
 
     path.push(name);
 
-    Ok(path)
+    Ok(())
 }
 
 /// Spawns the command to run independently of the compositor.