feat: sync theme with host appearance

refs #675

1 files changed, 21 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 2217bef2..3c66ff1d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -42,6 +42,18 @@ fn pop_keyboard_enhancement_flags() -> io::Result<()> {
     Ok(())
 }
 
+fn set_host_color_scheme_reports(enabled: bool) -> io::Result<()> {
+    use std::io::Write;
+
+    let sequence = if enabled {
+        crate::terminal_theme::HOST_COLOR_SCHEME_REPORT_ENABLE_SEQUENCE
+    } else {
+        crate::terminal_theme::HOST_COLOR_SCHEME_REPORT_DISABLE_SEQUENCE
+    };
+    io::stdout().write_all(sequence.as_bytes())?;
+    io::stdout().flush()
+}
+
 mod agent_resume;
 mod api;
 mod app;
@@ -102,6 +114,12 @@ const DEFAULT_CONFIG: &str = r##"# herdr configuration
 #                  vesper
 # name = "catppuccin"
 
+# Follow host terminal light/dark appearance and switch Herdr UI themes.
+# Existing manual behavior is unchanged unless this is true.
+# auto_switch = false
+# dark_name = "catppuccin"
+# light_name = "catppuccin-latte"
+
 # Override individual color tokens on top of the base theme.
 # Accepts: hex (#rrggbb), named colors, rgb(r,g,b), or panel_bg = "reset"
 # [theme.custom]
@@ -665,6 +683,7 @@ fn main() -> io::Result<()> {
             DisableBracketedPaste,
             DisableMouseCapture
         );
+        let _ = set_host_color_scheme_reports(false);
         let _ = pop_keyboard_enhancement_flags();
         ratatui::restore();
         original_hook(info);
@@ -691,6 +710,7 @@ fn main() -> io::Result<()> {
             execute!(io::stdout(), DisableMouseCapture)?;
         }
         execute!(io::stdout(), EnableBracketedPaste, EnableFocusChange)?;
+        set_host_color_scheme_reports(true)?;
         push_keyboard_enhancement_flags()?;
 
         // Some hosts do not honor Kitty keyboard enhancement pushes for
@@ -728,6 +748,7 @@ fn main() -> io::Result<()> {
             DisableBracketedPaste,
             DisableMouseCapture
         )?;
+        set_host_color_scheme_reports(false)?;
         ratatui::restore();
 
         // Drop app (and all workspaces/panes) before runtime shuts down