Add: validation of bundled themes in build workflow (#11627)

* Add: xtask to check themes for validation warnings

* Update: tidied up runtime paths

* Update: test build workflow

* Update: address clippy lints

* Revert: only trigger workflow on push to master branch

* Add: Theme::from_keys factory method to construct theme from Toml keys

* Update: returning validation failures in Loader.load method

* Update: commented out invalid keys from affected themes

* Update: correct invalid keys so that valid styles still applied

* Update: include default and base16_default themes in check

* Update: renamed validation_failures to load_errors

* Update: introduce load_with_warnings helper function and centralise logging of theme warnings

* Update: use consistent naming throughout

xtask/src/main.rs

@@ -2,6 +2,7 @@ mod docgen;
 mod helpers;
 mod path;
 mod querycheck;
+mod theme_check;
 
 use std::{env, error::Error};
 
@@ -11,6 +12,7 @@ pub mod tasks {
     use crate::docgen::{lang_features, typable_commands, write};
     use crate::docgen::{LANG_SUPPORT_MD_OUTPUT, TYPABLE_COMMANDS_MD_OUTPUT};
     use crate::querycheck::query_check;
+    use crate::theme_check::theme_check;
     use crate::DynError;
 
     pub fn docgen() -> Result<(), DynError> {
@@ -23,6 +25,10 @@ pub mod tasks {
         query_check()
     }
 
+    pub fn themecheck() -> Result<(), DynError> {
+        theme_check()
+    }
+
     pub fn print_help() {
         println!(
             "
@@ -43,6 +49,7 @@ fn main() -> Result<(), DynError> {
         Some(t) => match t.as_str() {
             "docgen" => tasks::docgen()?,
             "query-check" => tasks::querycheck()?,
+            "theme-check" => tasks::themecheck()?,
             invalid => return Err(format!("Invalid task name: {}", invalid).into()),
         },
     };

xtask/src/path.rs

@@ -11,8 +11,16 @@ pub fn book_gen() -> PathBuf {
     project_root().join("book/src/generated/")
 }
 
+pub fn runtime() -> PathBuf {
+    project_root().join("runtime")
+}
+
 pub fn ts_queries() -> PathBuf {
-    project_root().join("runtime/queries")
+    runtime().join("queries")
+}
+
+pub fn themes() -> PathBuf {
+    runtime().join("themes")
 }
 
 pub fn lang_config() -> PathBuf {

xtask/src/theme_check.rs

@@ -0,0 +1,33 @@
+use helix_view::theme::Loader;
+
+use crate::{path, DynError};
+
+pub fn theme_check() -> Result<(), DynError> {
+    let theme_names = [
+        vec!["default".to_string(), "base16_default".to_string()],
+        Loader::read_names(&path::themes()),
+    ]
+    .concat();
+    let loader = Loader::new(&[path::runtime()]);
+    let mut errors_present = false;
+
+    for name in theme_names {
+        let (_, warnings) = loader.load_with_warnings(&name).unwrap();
+
+        if !warnings.is_empty() {
+            errors_present = true;
+            println!("Theme '{name}' loaded with errors:");
+            for warning in warnings {
+                println!("\t* {}", warning);
+            }
+        }
+    }
+
+    match errors_present {
+        true => Err("Errors found when loading bundled themes".into()),
+        false => {
+            println!("Theme check successful!");
+            Ok(())
+        }
+    }
+}