kiloz

commit 8818b40b5d10f32db1b6454bb8a78a96c7685938
parent 89e4e22d67111a3943171460d2b8d24ecac789a9
Author: Martin Ashby <martin@ashbysoft.com>
Date:   Sat, 27 Jan 2024 22:02:06 +0000

Add status line and timeout

Diffstat:
M
src/main.zig
 | 
49
++++++++++++++++++++++++++++++++++++++++++++++++-

1 file changed, 48 insertions(+), 1 deletion(-)
diff --git a/src/main.zig b/src/main.zig
@@ -43,6 +43,8 @@ pub fn main() !void {
         try editorOpen(&es, args[1]);
     }
 
+    try editorSetStatusMessage(&es, "HELP: ctrl+q = quit", .{});
+
     while (true) {
         try editorRefreshScreen(&es);
 
@@ -50,12 +52,18 @@ pub fn main() !void {
             error.Quit => return,
             else => return e,
         };
+
+        try editorProcessTimeouts(&es);
     }
 }
 
 //// Data
 
 const EditorState = struct {
+    const StatusMsg = struct {
+        msg: []const u8,
+        time: std.time.Instant,
+    };
     a: std.mem.Allocator,
     screen_buf: std.ArrayListUnmanaged(u8) = .{},
     termios_orig: std.os.linux.termios = undefined,
@@ -69,6 +77,7 @@ const EditorState = struct {
     coloff: usize = 0,
     erow: []ERow = &[_]ERow{},
     filename: ?[]const u8 = null,
+    statusmsg: ?StatusMsg = null,
 
     dbglog: std.ArrayList(u8),
 
@@ -85,6 +94,9 @@ const EditorState = struct {
             self.a.free(erow.render);
         }
         self.a.free(self.erow);
+        if (self.statusmsg) |*statusmsg| {
+            self.a.free(statusmsg.msg);
+        }
 
         const wtr = std.io.getStdOut().writer();
         wtr.writeAll(self.dbglog.items) catch {};
@@ -97,6 +109,17 @@ const ERow = struct {
     render: []u8,
 };
 
+fn editorProcessTimeouts(es: *EditorState) !void {
+    if (es.statusmsg) |*smg| {
+        const now = try std.time.Instant.now();
+        if (now.since(smg.time) > 5 * std.time.ns_per_s) {
+            const x = smg.msg;
+            es.statusmsg = null;
+            es.a.free(x);
+        }
+    }
+}
+
 //// Terminal handling
 
 // Returns the original termios setting for restoring terminal function at exit.
@@ -320,6 +343,7 @@ fn editorRefreshScreen(es: *EditorState) !void {
     try wtr.writeAll("\x1b[H"); // Reset cursor (to 1:1)
     try editorDrawRows(es, wtr);
     try editorDrawStatusBar(es, wtr);
+    try editorDrawMessageBar(es, wtr);
     try std.fmt.format(wtr, "\x1b[{};{}H", .{
         es.cy - es.rowoff + 1,
         es.rx - es.coloff + 1,
@@ -380,6 +404,16 @@ fn editorDrawStatusBar(es: *const EditorState, wtr: anytype) !void {
     }
     try wtr.writeAll(buf);
     try wtr.writeAll("\x1b[m"); // normal colours
+    try wtr.writeAll("\r\n"); // Make another line for input bar
+}
+
+fn editorDrawMessageBar(es: *EditorState, wtr: anytype) !void {
+    try wtr.writeAll("\x1b[K");
+    if (es.statusmsg) |statusmsg| {
+        var tw = truncateWriter(wtr, es.screencols);
+        const wtr2 = tw.writer();
+        try wtr2.writeAll(statusmsg.msg);
+    }
 }
 
 fn editorScroll(es: *EditorState) void {
@@ -402,6 +436,19 @@ fn editorScroll(es: *EditorState) void {
     }
 }
 
+fn editorSetStatusMessage(es: *EditorState, comptime fmt: []const u8, args: anytype) !void {
+    if (es.statusmsg) |*smg| {
+        const x = smg.msg;
+        es.statusmsg = null;
+        es.a.free(x);
+    }
+    const y: EditorState.StatusMsg = .{
+        .msg = try std.fmt.allocPrint(es.a, fmt, args),
+        .time = try std.time.Instant.now(),
+    };
+    es.statusmsg = y;
+}
+
 //// Input
 
 fn editorProcessKeyPress(es: *EditorState) !void {
@@ -483,7 +530,7 @@ fn editorMoveCursor(key: editorKey, es: *EditorState) void {
 
 fn initEditor(es: *EditorState) !void {
     const sz = try getWindowSize();
-    es.screenrows = sz.rows - 1; // Allow room for status bar
+    es.screenrows = sz.rows - 2; // Allow room for status bar and message bar
     es.screencols = sz.cols;
 }