feat(plugin): add manifest to allow for plugin configuration (#660)

* feat(plugins-manifest): Add a plugins manifest to allow for more configuration of plugins

* refactor(plugins-manifest): Better storage of plugin metadata in wasm_vm

* fix(plugins-manifest): Inherit permissions from run configuration

* refactor(plugins-manifest): Rename things for more clarity

- The Plugins/Plugin structs had "Config" appended to them to clarify
  that they're metadata about plugins, and not the plugins themselves.

- The PluginType::OncePerPane variant was renamed to be just
  PluginType::Pane, and the documentation clarified to explain what it
  is.

- The "service" nomenclature was completely removed in favor of
  "headless".

* refactor(plugins-manifest): Move security warning into start plugin

* refactor(plugins-manifest): Remove hack in favor of standard method

* refactor(plugins-manifest): Change display of plugin location

The only time that a plugin location is displayed in Zellij is the
border of the pane. Having `zellij:strider` display instead of just
`strider` was a little annoying, so we're stripping out the scheme
information from a locations display.

* refactor(plugins-manifest): Add a little more documentation

* fix(plugins-manifest): Formatting

Co-authored-by: Jesse Tuchsen <not@disclosing>

3 files changed, 29 insertions, 4 deletions

diff --git a/zellij-tile/src/data.rs b/zellij-tile/src/data.rs
index 44708627f..6ca70c28d 100644
--- a/zellij-tile/src/data.rs
+++ b/zellij-tile/src/data.rs
@@ -1,4 +1,5 @@
 use serde::{Deserialize, Serialize};
+use std::fmt;
 use std::str::FromStr;
 use strum_macros::{EnumDiscriminants, EnumIter, EnumString, ToString};
 
@@ -169,6 +170,28 @@ pub struct PluginIds {
     pub zellij_pid: u32,
 }
 
+/// Tag used to identify the plugin in layout and config yaml files
+#[derive(Debug, Default, Clone, PartialEq, Eq, Hash, Deserialize, Serialize)]
+pub struct PluginTag(String);
+
+impl PluginTag {
+    pub fn new(url: impl Into<String>) -> Self {
+        PluginTag(url.into())
+    }
+}
+
+impl From<PluginTag> for String {
+    fn from(tag: PluginTag) -> Self {
+        tag.0
+    }
+}
+
+impl fmt::Display for PluginTag {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash, Deserialize, Serialize)]
 pub struct PluginCapabilities {
     pub arrow_fonts: bool,
diff --git a/zellij-tile/src/lib.rs b/zellij-tile/src/lib.rs
index af7d8ca12..96483c3c3 100644
--- a/zellij-tile/src/lib.rs
+++ b/zellij-tile/src/lib.rs
@@ -27,7 +27,9 @@ macro_rules! register_plugin {
         #[no_mangle]
         pub fn update() {
             STATE.with(|state| {
-                state.borrow_mut().update($crate::shim::object_from_stdin());
+                state
+                    .borrow_mut()
+                    .update($crate::shim::object_from_stdin().unwrap());
             });
         }
 
diff --git a/zellij-tile/src/shim.rs b/zellij-tile/src/shim.rs
index bdd6f4fb1..6904d3f7d 100644
--- a/zellij-tile/src/shim.rs
+++ b/zellij-tile/src/shim.rs
@@ -24,7 +24,7 @@ pub fn set_selectable(selectable: bool) {
 // Query Functions
 pub fn get_plugin_ids() -> PluginIds {
     unsafe { host_get_plugin_ids() };
-    object_from_stdin()
+    object_from_stdin().unwrap()
 }
 
 // Host Functions
@@ -45,10 +45,10 @@ pub fn exec_cmd(cmd: &[&str]) {
 // Internal Functions
 
 #[doc(hidden)]
-pub fn object_from_stdin<T: DeserializeOwned>() -> T {
+pub fn object_from_stdin<T: DeserializeOwned>() -> Result<T, serde_json::Error> {
     let mut json = String::new();
     io::stdin().read_line(&mut json).unwrap();
-    serde_json::from_str(&json).unwrap()
+    serde_json::from_str(&json)
 }
 
 #[doc(hidden)]