terminal: add support for Alternate Scroll Mode (xterm)

If mouse mode is on, using the mouse scroll wheel will scroll inside
meli.

Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>

meli/src/mail/listing.rs

@@ -1811,7 +1811,11 @@ impl Component for Listing {
                         _ => {}
                     },
                     UIEvent::Input(ref key)
-                        if shortcut!(key == shortcuts[Shortcuts::LISTING]["scroll_up"]) =>
+                        if shortcut!(key == shortcuts[Shortcuts::LISTING]["scroll_up"])
+                            || matches!(
+                                key,
+                                Key::Mouse(MouseEvent::Press(MouseButton::WheelUp, _, __))
+                            ) =>
                     {
                         let amount = if self.cmd_buf.is_empty() {
                             1
@@ -1834,7 +1838,11 @@ impl Component for Listing {
                         return true;
                     }
                     UIEvent::Input(ref key)
-                        if shortcut!(key == shortcuts[Shortcuts::LISTING]["scroll_down"]) =>
+                        if shortcut!(key == shortcuts[Shortcuts::LISTING]["scroll_down"])
+                            || matches!(
+                                key,
+                                Key::Mouse(MouseEvent::Press(MouseButton::WheelDown, _, __))
+                            ) =>
                     {
                         let amount = if self.cmd_buf.is_empty() {
                             1

meli/src/terminal.rs

@@ -97,12 +97,6 @@ macro_rules! derive_csi_sequence {
             }
         }
 
-        impl AsRef<[u8]> for $name {
-            fn as_ref(&self) -> &'static [u8] {
-                csi!($value).as_bytes()
-            }
-        }
-
         impl AsRef<str> for $name {
             fn as_ref(&self) -> &'static str {
                 csi!($value)
@@ -131,6 +125,16 @@ derive_csi_sequence!(
     (DisableSGRMouse, "?1006l")
 );
 
+derive_csi_sequence!(
+    ///Ps = 1 0 0 7  Enable Alternate Scroll Mode, xterm.
+    (EnableAlternateScrollMode, "?1007h")
+);
+
+derive_csi_sequence!(
+    ///Ps = 1 0 0 7  Disable Alternate Scroll Mode, xterm.
+    (DisableAlternateScrollMode, "?1007l")
+);
+
 derive_csi_sequence!(
     #[doc = "`CSI Ps ; Ps ; Ps t`, where `Ps = 2 2 ; 0`  -> Save xterm icon and window title on \
              stack."]

meli/src/terminal/screen.rs

@@ -27,8 +27,9 @@ use termion::{clear, cursor, raw::IntoRawMode, screen::AlternateScreen};
 
 use crate::{
     terminal::{
-        cells::CellBuffer, Alignment, BracketModeEnd, BracketModeStart, Cell, Color, DisableMouse,
+        cells::CellBuffer, Alignment, BracketModeEnd, BracketModeStart, Cell, Color,
-        DisableSGRMouse, EnableMouse, EnableSGRMouse, Pos, RestoreWindowTitleIconFromStack,
+        DisableAlternateScrollMode, DisableMouse, DisableSGRMouse, EnableAlternateScrollMode,
+        EnableMouse, EnableSGRMouse, Pos, RestoreWindowTitleIconFromStack,
         SaveWindowTitleIconToStack,
     },
     Attr, Context,
@@ -88,6 +89,31 @@ impl Tty {
     #[inline]
     pub fn set_mouse(&mut self, mouse: bool) -> &mut Self {
         self.mouse = mouse;
+        let Some(stdout) = self.stdout.as_mut() else {
+            return self;
+        };
+        write!(
+            stdout,
+            "{enable_mouse}{enable_sgr_mouse}{enable_alt_scroll}",
+            enable_mouse = if mouse {
+                EnableMouse.as_ref()
+            } else {
+                DisableMouse.as_ref()
+            },
+            enable_sgr_mouse = if mouse {
+                EnableSGRMouse.as_ref()
+            } else {
+                DisableSGRMouse.as_ref()
+            },
+            enable_alt_scroll = if mouse {
+                EnableAlternateScrollMode.as_ref()
+            } else {
+                DisableAlternateScrollMode.as_ref()
+            },
+        )
+        .expect("Could not write to stdout");
+        _ = stdout.flush();
+
         self
     }
 
@@ -315,13 +341,18 @@ impl Screen<Tty> {
         let mouse = self.display.mouse;
         write!(
             stdout,
-            "{}{}{}{}{disable_sgr_mouse}{disable_mouse}",
+            "{}{}{}{}{disable_sgr_mouse}{disable_mouse}{disable_alt_scroll}",
             termion::screen::ToMainScreen,
             cursor::Show,
             RestoreWindowTitleIconFromStack,
             BracketModeEnd,
             disable_sgr_mouse = if mouse { DisableSGRMouse.as_ref() } else { "" },
             disable_mouse = if mouse { DisableMouse.as_ref() } else { "" },
+            disable_alt_scroll = if mouse {
+                DisableAlternateScrollMode.as_ref()
+            } else {
+                ""
+            },
         )
         .unwrap();
         self.flush();
@@ -336,7 +367,7 @@ impl Screen<Tty> {
 
         write!(
             &mut stdout,
-            "{save_title_to_stack}{}{}{}{window_title}{}{}{enable_mouse}{enable_sgr_mouse}",
+            "{save_title_to_stack}{}{}{}{window_title}{}{}{enable_mouse}{enable_sgr_mouse}{enable_alt_scroll}",
             termion::screen::ToAlternateScreen,
             cursor::Hide,
             clear::All,
@@ -358,6 +389,11 @@ impl Screen<Tty> {
             } else {
                 ""
             },
+            enable_alt_scroll = if self.display.mouse {
+                EnableAlternateScrollMode.as_ref()
+            } else {
+                ""
+            },
         )
         .unwrap();