multicall: cleanup; modularize

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I658f22fdf983777354a5beb32df631916a6a6964

src/multicall/mod.rs

@@ -0,0 +1,44 @@
+// Reference documentation:
+// https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_data_device
+// https://docs.rs/wl-clipboard-rs/latest/wl_clipboard_rs
+// https://github.com/YaLTeR/wl-clipboard-rs/blob/master/wl-clipboard-rs-tools/src/bin/wl_copy.rs
+pub mod wl_copy;
+pub mod wl_paste;
+
+use std::env;
+
+/// Extract the base name from argv[0].
+fn get_base(argv0: &str) -> &str {
+  std::path::Path::new(argv0)
+    .file_name()
+    .and_then(|name| name.to_str())
+    .unwrap_or("")
+}
+
+/// Dispatch multicall binary logic based on `argv[0]`.
+/// Returns `true` if a multicall command was handled and the process should
+/// exit.
+pub fn multicall_dispatch() -> bool {
+  let argv0 = env::args().next().unwrap_or_else(|| {
+    log::warn!("unable to determine program name");
+    String::new()
+  });
+  let base = get_base(&argv0);
+  match base {
+    "stash-copy" | "wl-copy" => {
+      if let Err(e) = wl_copy::wl_copy_main() {
+        log::error!("copy failed: {e}");
+        std::process::exit(1);
+      }
+      true
+    },
+    "stash-paste" | "wl-paste" => {
+      if let Err(e) = wl_paste::wl_paste_main() {
+        log::error!("paste failed: {e}");
+        std::process::exit(1);
+      }
+      true
+    },
+    _ => false,
+  }
+}