Launch with defaults upon invalid config/theme (#982)

* Launch with defaults upon invalid config/theme

* Startup message if there is a problematic config
* Statusline error if trying to switch to an invalid theme

* Use serde `deny_unknown_fields` for config

1 files changed, 2 insertions, 1 deletions

diff --git a/helix-term/src/config.rs b/helix-term/src/config.rs
index 13917656..3745f871 100644
--- a/helix-term/src/config.rs
+++ b/helix-term/src/config.rs
@@ -3,6 +3,7 @@ use serde::Deserialize;
 use crate::keymap::Keymaps;
 
 #[derive(Debug, Default, Clone, PartialEq, Deserialize)]
+#[serde(deny_unknown_fields)]
 pub struct Config {
     pub theme: Option<String>,
     #[serde(default)]
@@ -14,7 +15,7 @@ pub struct Config {
 }
 
 #[derive(Debug, Default, Clone, PartialEq, Deserialize)]
-#[serde(rename_all = "kebab-case")]
+#[serde(rename_all = "kebab-case", deny_unknown_fields)]
 pub struct LspConfig {
     pub display_messages: bool,
 }