feat(toggle-with-cycle): allows cycling option values at runtime

helix-term/src/commands/typed.rs

@@ -8,7 +8,6 @@ use super::*;
 use helix_core::{encoding, shellwords::Shellwords};
 use helix_view::document::DEFAULT_LANGUAGE_NAME;
 use helix_view::editor::{Action, CloseError, ConfigEvent};
-use serde_json::Value;
 use ui::completers::{self, Completer};
 
 #[derive(Clone)]
@@ -1790,8 +1789,8 @@ fn toggle_option(
         return Ok(());
     }
 
-    if args.len() != 1 {
-        anyhow::bail!("Bad arguments. Usage: `:toggle key`");
+    if args.is_empty() {
+        anyhow::bail!("Bad arguments. Usage: `:toggle key [values]?`");
     }
     let key = &args[0].to_lowercase();
 
@@ -1801,15 +1800,38 @@ fn toggle_option(
     let pointer = format!("/{}", key.replace('.', "/"));
     let value = config.pointer_mut(&pointer).ok_or_else(key_error)?;
 
-    let Value::Bool(old_value) = *value else {
-        anyhow::bail!("Key `{}` is not toggle-able", key)
+    let new_value = if let Some(old_value) = value.as_bool() {
+        serde_json::Value::Bool(!old_value)
+    } else {
+        if args.len() != 2 {
+            anyhow::bail!(
+                "Bad arguments. For non-boolean configurations use: `:toggle key val1,val2`"
+            );
+        }
+
+        // The comma separated values to cycle
+        let first_arg = &args[1];
+        let field_error = |_| anyhow::anyhow!("Could not parse field `{}`", first_arg);
+
+        if let Some(new_value) = value.as_str().and_then(|old_value| {
+            let mut entries = first_arg.split(',').peekable();
+            let first = entries.peek().map(|e| e.to_owned());
+            entries
+                .skip_while(|e| e != &old_value)
+                .nth(1)
+                .or(first)
+                .map(|new_value| serde_json::Value::String(new_value.to_string()))
+        }) {
+            new_value
+        } else {
+            first_arg.parse().map_err(field_error)?
+        }
     };
 
-    let new_value = !old_value;
-    *value = Value::Bool(new_value);
-    // This unwrap should never fail because we only replace one boolean value
-    // with another, maintaining a valid json config
-    let config = serde_json::from_value(config).unwrap();
+    *value = new_value.clone();
+
+    let config = serde_json::from_value(config)
+        .map_err(|_| anyhow::anyhow!("Could not parse field: `{:?}`", &args))?;
 
     cx.editor
         .config_events