fix builds on android

Since Canop#803 introduced a dependency on the trash crate, broot does not
compile any more on Android. This change makes the trash crate only
pulled in on platforms which support it, and otherwise the trash command
displays an error.

Cargo.toml

@@ -62,7 +62,6 @@ termimad = "0.29.2"
 terminal-clipboard = { version = "0.4.1", optional = true }
 terminal-light = "1.4.0"
 toml = "0.8"
-trash = "3.1.2"
 umask = "2.1.0"
 unicode-width = "0.1.10"
 which = "4.4.0"
@@ -78,6 +77,11 @@ uzers = "0.11.3"
 [target.'cfg(windows)'.dependencies]
 is_executable = "1.0.1"
 
+# Unfortunately, we can't use the `trash_supported` attribute for dependency
+# resolution
+[target.'cfg(any(target_os = "macos", target_os = "windows", all(unix, not(target_os = "android"))))'.dependencies]
+trash = "3.1.2"
+
 [build-dependencies]
 clap = { version = "4.4", features = ["derive", "cargo"] }
 clap_complete = "4.4"

build.rs

@@ -6,10 +6,7 @@
 use {
     clap::CommandFactory,
     clap_complete::{Generator, Shell},
-    std::{
-        env,
-        ffi::OsStr,
-    },
+    std::{env, ffi::OsStr},
 };
 
 include!("src/cli/args.rs");
@@ -19,15 +16,14 @@ include!("src/cli/args.rs");
 /// so this generation is usually not needed
 pub const BUILD_MAN_PAGE: bool = false;
 
-fn write_completions_file<G: Generator + Copy, P: AsRef<OsStr>>(generator: G, out_dir: P) {
+fn write_completions_file<G: Generator + Copy, P: AsRef<OsStr>>(
+    generator: G,
+    out_dir: P,
+) {
     let mut args = Args::command();
     for name in &["broot", "br"] {
-        clap_complete::generate_to(
-            generator,
-            &mut args,
-            name.to_string(),
-            &out_dir,
-        ).expect("clap complete generation failed");
+        clap_complete::generate_to(generator, &mut args, name.to_string(), &out_dir)
+            .expect("clap complete generation failed");
     }
 }
 
@@ -57,10 +53,24 @@ fn build_man_page() -> std::io::Result<()> {
     Ok(())
 }
 
+fn platform_flags() {
+    if cfg!(any(
+        target_os = "macos",
+        target_os = "windows",
+        all(unix, not(target_os = "android"))
+    )) {
+        println!("cargo:rustc-cfg=trash_supported");
+    }
+}
+
 fn main() -> std::io::Result<()> {
     build_completion_scripts();
+
     if BUILD_MAN_PAGE {
         build_man_page()?;
     }
+
+    platform_flags();
+
     Ok(())
 }

src/browser/browser_state.rs

@@ -632,13 +632,18 @@ impl PanelState for BrowserState {
             Internal::trash => {
                 let path = self.displayed_tree().selected_line().path.to_path_buf();
                 info!("trash {:?}", &path);
+
+                #[cfg(trash_supported)]
                 match trash::delete(&path) {
                     Ok(()) => CmdResult::RefreshState { clear_cache: true },
                     Err(e) => {
                         warn!("trash error: {:?}", &e);
                         CmdResult::DisplayError(format!("trash error: {:?}", &e))
                     }
                 }
+
+                #[cfg(not(trash_supported))]
+                CmdResult::DisplayError("platform does not support trash".into())
             }
             Internal::quit => CmdResult::Quit,
             _ => self.on_internal_generic(

src/stage/stage_state.rs

@@ -496,13 +496,18 @@ impl PanelState for StageState {
             }
             Internal::trash => {
                 info!("trash {} staged files", app_state.stage.len());
+
+                #[cfg(trash_supported)]
                 match trash::delete_all(app_state.stage.paths()) {
                     Ok(()) => CmdResult::RefreshState { clear_cache: true },
                     Err(e) => {
                         warn!("trash error: {:?}", &e);
                         CmdResult::DisplayError(format!("trash error: {:?}", &e))
                     }
                 }
+
+                #[cfg(not(trash_supported))]
+                CmdResult::DisplayError("platform does not support trash".into())
             }
             _ => self.on_internal_generic(
                 w,