feat(library): Add constants for plugin paths

src/codec.rs

@@ -1,7 +1,7 @@
+use blocking::Unblock;
 use futures_codec::{FramedRead, LinesCodec};
 use futures_lite::{AsyncRead, Stream, StreamExt};
 use serde::Deserialize;
-use blocking::Unblock;
 use std::io;
 
 /// stdin with AsyncRead support

src/lib.rs

@@ -2,8 +2,35 @@ mod codec;
 
 pub use self::codec::*;
 
+use const_format::concatcp;
 use serde::{Deserialize, Serialize};
-use std::{borrow::Cow, path::PathBuf};
+use std::{borrow::Cow, path::{Path, PathBuf}};
+
+pub const LOCAL: &str = "~/.local/share/pop-launcher";
+pub const LOCAL_PLUGINS: &str = concatcp!(LOCAL, "/plugins");
+
+pub const SYSTEM: &str = "/etc/pop-launcher";
+pub const SYSTEM_PLUGINS: &str = concatcp!(SYSTEM, "/plugins");
+
+pub const DISTRIBUTION: &str = "/usr/lib/pop-launcher";
+pub const DISTRIBUTION_PLUGINS: &str = concatcp!(DISTRIBUTION, "/plugins");
+
+pub const PLUGIN_PATHS: &[&str] = &[LOCAL_PLUGINS, SYSTEM_PLUGINS, DISTRIBUTION_PLUGINS];
+
+pub fn plugin_paths() -> impl Iterator<Item = Cow<'static, Path>> {
+    PLUGIN_PATHS.iter()
+        .map(|path| {
+            #[allow(deprecated)]
+            if let Some(path) = path.strip_prefix("~/") {
+                let path = std::env::home_dir()
+                    .expect("user does not have home dir")
+                    .join(path);
+                Cow::Owned(path)
+            } else {
+                Cow::Borrowed(Path::new(path))
+            }
+        })
+}
 
 /// u32 value defining the generation of an indice.
 pub type Generation = u32;
@@ -57,7 +84,6 @@ pub struct PluginSearchResult {
     pub window: Option<(Generation, Indice)>,
 }
 
-
 // Sent to the input pipe of the launcher service, and disseminated to its plugins.
 #[derive(Debug, Deserialize, Serialize)]
 pub enum Request {