Merge pull request #403 from mitchellh/prompt-continuation

Semantic prompt resize should only clear most recent prompt

src/terminal/Screen.zig

@@ -155,13 +155,14 @@ pub const RowHeader = struct {
         /// This is a prompt line, meaning it only contains the shell prompt.
         /// For poorly behaving shells, this may also be the input.
         prompt = 1,
+        prompt_continuation = 2,
 
         /// This line contains the input area. We don't currently track
         /// where this actually is in the line, so we just assume it is somewhere.
-        input = 2,
+        input = 3,
 
         /// This line is the start of command output.
-        command = 3,
+        command = 4,
     };
 };
 
@@ -1762,7 +1763,7 @@ fn jumpPrompt(self: *Screen, delta: isize) bool {
     while (y >= 0 and y <= max_y and delta_rem > 0) : (y += step) {
         const row = self.getRow(.{ .screen = @intCast(y) });
         switch (row.getSemanticPrompt()) {
-            .prompt, .input => delta_rem -= 1,
+            .prompt, .prompt_continuation, .input => delta_rem -= 1,
             .command, .unknown => {},
         }
     }

src/terminal/Terminal.zig

@@ -40,6 +40,7 @@ pub const ScreenType = enum {
 /// See: https://gitlab.freedesktop.org/Per_Bothner/specifications/blob/master/proposals/semantic-prompts.md
 pub const SemanticPrompt = enum {
     prompt,
+    prompt_continuation,
     input,
     command,
 };
@@ -361,12 +362,18 @@ fn clearPromptForResize(self: *Terminal) void {
             const real_y = self.screen.cursor.y - y;
             const row = self.screen.getRow(.{ .active = real_y });
             switch (row.getSemanticPrompt()) {
-                // If we're at a prompt or input area, then we are at a prompt.
+                // We are at a prompt but we're not at the start of the prompt.
                 // We mark our found value and continue because the prompt
                 // may be multi-line.
-                .prompt,
+                .input => found = real_y,
-                .input,
+
-                => found = real_y,
+                // If we find the prompt then we're done. We are also done
+                // if we find any prompt continuation, because the shells
+                // that send this currently (zsh) cannot redraw every line.
+                .prompt, .prompt_continuation => {
+                    found = real_y;
+                    break;
+                },
 
                 // If we have command output, then we're most certainly not
                 // at a prompt. Break out of the loop.
@@ -1535,6 +1542,7 @@ pub fn markSemanticPrompt(self: *Terminal, p: SemanticPrompt) void {
     const row = self.screen.getRow(.{ .active = self.screen.cursor.y });
     row.setSemanticPrompt(switch (p) {
         .prompt => .prompt,
+        .prompt_continuation => .prompt_continuation,
         .input => .input,
         .command => .command,
     });
@@ -1557,6 +1565,7 @@ pub fn cursorIsAtPrompt(self: *Terminal) bool {
         switch (row.getSemanticPrompt()) {
             // If we're at a prompt or input area, then we are at a prompt.
             .prompt,
+            .prompt_continuation,
             .input,
             => return true,
 

src/terminal/osc.zig

@@ -26,6 +26,7 @@ pub const Command = union(enum) {
     /// not all shells will send the prompt end code.
     prompt_start: struct {
         aid: ?[]const u8 = null,
+        kind: enum { primary, right, continuation } = .primary,
         redraw: bool = true,
     },
 
@@ -397,6 +398,21 @@ pub const Parser = struct {
                 },
                 else => {},
             }
+        } else if (mem.eql(u8, self.temp_state.key, "k")) {
+            // The "k" marks the kind of prompt, or "primary" if we don't know.
+            // This can be used to distinguish between the first prompt,
+            // a continuation, etc.
+            switch (self.command) {
+                .prompt_start => |*v| if (value.len == 1) {
+                    v.kind = switch (value[0]) {
+                        'c', 's' => .continuation,
+                        'r' => .right,
+                        'i' => .primary,
+                        else => .primary,
+                    };
+                },
+                else => {},
+            }
         } else log.info("unknown semantic prompts option: {s}", .{self.temp_state.key});
     }
 
@@ -508,6 +524,20 @@ test "OSC: prompt_start with redraw invalid value" {
     const cmd = p.end().?;
     try testing.expect(cmd == .prompt_start);
     try testing.expect(cmd.prompt_start.redraw);
+    try testing.expect(cmd.prompt_start.kind == .primary);
+}
+
+test "OSC: prompt_start with continuation" {
+    const testing = std.testing;
+
+    var p: Parser = .{};
+
+    const input = "133;A;k=c";
+    for (input) |ch| p.next(ch);
+
+    const cmd = p.end().?;
+    try testing.expect(cmd == .prompt_start);
+    try testing.expect(cmd.prompt_start.kind == .continuation);
 }
 
 test "OSC: end_of_command no exit code" {

src/terminal/stream.zig

@@ -802,8 +802,9 @@ pub fn Stream(comptime Handler: type) type {
                 },
 
                 .prompt_start => |v| {
-                    if (@hasDecl(T, "promptStart")) {
+                    if (@hasDecl(T, "promptStart")) switch (v.kind) {
-                        try self.handler.promptStart(v.aid, v.redraw);
+                        .primary, .right => try self.handler.promptStart(v.aid, v.redraw),
+                        .continuation => try self.handler.promptContinuation(v.aid),
                     } else log.warn("unimplemented OSC callback: {}", .{cmd});
                 },
 

src/termio/Exec.zig

@@ -1623,6 +1623,11 @@ const StreamHandler = struct {
         self.terminal.flags.shell_redraws_prompt = redraw;
     }
 
+    pub fn promptContinuation(self: *StreamHandler, aid: ?[]const u8) !void {
+        _ = aid;
+        self.terminal.markSemanticPrompt(.prompt_continuation);
+    }
+
     pub fn promptEnd(self: *StreamHandler) !void {
         self.terminal.markSemanticPrompt(.input);
     }