fix: surface rejected configuration in a floating startup diagnostic

src/editor.rs

@@ -62,6 +62,13 @@ pub struct Palette {
     pub selected: usize,
 }
 
+pub struct StartupDiagnostic {
+    pub lines: Vec<String>,
+    pub top: usize,
+    pub left: usize,
+    max_column: usize,
+}
+
 pub struct Hover {
     text: String,
     line_starts: Vec<usize>,
@@ -878,6 +885,7 @@ pub struct Editor {
     leader_display: String,
     palette: Option<Palette>,
     hover: Option<Hover>,
+    startup_diagnostic: Option<StartupDiagnostic>,
     project_root: PathBuf,
     file_picker: Option<FilePicker>,
     file_explorer_side: DockSide,
@@ -936,6 +944,7 @@ impl Editor {
             leader_display: String::new(),
             palette: None,
             hover: None,
+            startup_diagnostic: None,
             project_root: std::env::current_dir()?,
             file_picker: None,
             file_explorer_side: DockSide::Right,
@@ -1217,6 +1226,25 @@ impl Editor {
         self.palette.as_ref()
     }
 
+    pub fn startup_diagnostic(&self) -> Option<&StartupDiagnostic> {
+        self.startup_diagnostic.as_ref()
+    }
+
+    pub(crate) fn show_startup_diagnostic(&mut self, text: String) {
+        let lines = split_lines(&text);
+        let max_column = lines
+            .iter()
+            .map(|line| line.graphemes(true).count())
+            .max()
+            .unwrap_or(0);
+        self.startup_diagnostic = Some(StartupDiagnostic {
+            lines,
+            top: 0,
+            left: 0,
+            max_column,
+        });
+    }
+
     /// Borrowed popup state, visible only while its source remains current.
     pub fn hover(&self) -> Option<&Hover> {
         self.hover.as_ref().filter(|hover| {
@@ -1981,6 +2009,30 @@ impl Editor {
             Input::Ctrl(ch) => control_key(ch),
             input => input,
         };
+        if let Some(diagnostic) = &mut self.startup_diagnostic {
+            match input {
+                Input::Enter | Input::Escape => self.startup_diagnostic = None,
+                Input::Up | Input::Ctrl('k') => diagnostic.top = diagnostic.top.saturating_sub(1),
+                Input::Down | Input::Ctrl('j') => {
+                    diagnostic.top = diagnostic
+                        .top
+                        .saturating_add(1)
+                        .min(diagnostic.lines.len() - 1)
+                }
+                Input::Left | Input::Ctrl('h') => {
+                    diagnostic.left = diagnostic.left.saturating_sub(1)
+                }
+                Input::Right | Input::Ctrl('l') => {
+                    diagnostic.left = diagnostic.left.saturating_add(1).min(diagnostic.max_column)
+                }
+                Input::Home => {
+                    diagnostic.top = 0;
+                    diagnostic.left = 0;
+                }
+                _ => {}
+            }
+            return None;
+        }
         if self.handle_hover(&input) {
             return None;
         }