From 3e0e75c9c8f5efcfb43a4fa4797e3533b6da947a Mon Sep 17 00:00:00 2001
From: CJ van den Berg <cj@vdbonline.com>
Date: Mon, 11 Aug 2025 14:29:23 +0200
Subject: [PATCH] feat: add interactive and non-interactive commands to set the
 current buffer's tab_width

---
 src/tui/editor.zig              | 18 ++++++++++++++++++
 src/tui/mode/mini/tab_width.zig | 16 ++++++++++++++++
 src/tui/tui.zig                 |  5 +++++
 3 files changed, 39 insertions(+)
 create mode 100644 src/tui/mode/mini/tab_width.zig

diff --git a/src/tui/editor.zig b/src/tui/editor.zig
index 701626d..b9fce38 100644
--- a/src/tui/editor.zig
+++ b/src/tui/editor.zig
@@ -432,6 +432,7 @@ pub const Editor = struct {
             tp.extract_cbor(&cursels_cbor),
         }))
             return error.RestoreStateMatch;
+        self.refresh_tab_width();
         if (op == .open_file)
             try self.open(file_path);
         self.clipboard = if (clipboard.len > 0) try self.allocator.dupe(u8, clipboard) else null;
@@ -702,6 +703,23 @@ pub const Editor = struct {
         return;
     }
 
+    fn refresh_tab_width(self: *Self) void {
+        self.metrics = self.plane.metrics(self.tab_width);
+        switch (self.indent_mode) {
+            .spaces, .auto => {},
+            .tabs => self.indent_size = self.tab_width,
+        }
+    }
+
+    pub fn set_tab_width(self: *Self, ctx: Context) Result {
+        var tab_width: usize = 0;
+        if (!try ctx.args.match(.{tp.extract(&tab_width)}))
+            return error.InvalidSetTabWidthArgument;
+        self.tab_width = tab_width;
+        self.refresh_tab_width();
+    }
+    pub const set_tab_width_meta: Meta = .{ .arguments = &.{.integer} };
+
     fn close(self: *Self) !void {
         var meta = std.ArrayListUnmanaged(u8).empty;
         defer meta.deinit(self.allocator);
diff --git a/src/tui/mode/mini/tab_width.zig b/src/tui/mode/mini/tab_width.zig
new file mode 100644
index 0000000..a2ca836
--- /dev/null
+++ b/src/tui/mode/mini/tab_width.zig
@@ -0,0 +1,16 @@
+const command = @import("command");
+
+pub const Type = @import("numeric_input.zig").Create(@This());
+pub const create = Type.create;
+
+pub fn name(_: *Type) []const u8 {
+    return " tab size";
+}
+
+pub const preview = goto;
+pub const apply = goto;
+pub const cancel = goto;
+
+fn goto(self: *Type) void {
+    command.executeName("set_tab_width", command.fmt(.{self.input orelse self.start})) catch {};
+}
diff --git a/src/tui/tui.zig b/src/tui/tui.zig
index 3a3e7c8..f762102 100644
--- a/src/tui/tui.zig
+++ b/src/tui/tui.zig
@@ -744,6 +744,11 @@ const cmds = struct {
     }
     pub const force_terminate_meta: Meta = .{ .description = "Force quit without saving" };
 
+    pub fn tab_width(self: *Self, ctx: Ctx) Result {
+        return enter_mini_mode(self, @import("mode/mini/tab_width.zig"), ctx);
+    }
+    pub const tab_width_meta: Meta = .{ .description = "Set tab width" };
+
     pub fn set_theme(self: *Self, ctx: Ctx) Result {
         var name: []const u8 = undefined;
         if (!try ctx.args.match(.{tp.extract(&name)}))