diff --git a/src/keybind/builtin/flow.json b/src/keybind/builtin/flow.json
index c619abc..f527c3b 100644
--- a/src/keybind/builtin/flow.json
+++ b/src/keybind/builtin/flow.json
@@ -136,6 +136,9 @@
             ["alt+u", "to_upper"],
             ["alt+l", "to_lower"],
             ["alt+c", "switch_case"],
+            ["ctrl+_", "underline"],
+            ["ctrl+=", "underline_with_char", "=", "solid"],
+            ["ctrl+plus", "underline_with_char", "="],
             ["alt+b", "move_word_left"],
             ["alt+f", "move_word_right"],
             ["alt+s", "filter", "sort"],
@@ -437,7 +440,7 @@
             ["backspace", "mini_mode_delete_backwards"]
         ]
     },
-    "mini/move_to_char": {
+    "mini/get_char": {
         "press": [
             ["ctrl+g", "mini_mode_cancel"],
             ["ctrl+c", "mini_mode_cancel"],
diff --git a/src/tui/editor.zig b/src/tui/editor.zig
index dc89c6a..3cf398f 100644
--- a/src/tui/editor.zig
+++ b/src/tui/editor.zig
@@ -3632,6 +3632,60 @@ pub const Editor = struct {
     }
     pub const dupe_down_meta: Meta = .{ .description = "Duplicate line or selection down/forwards", .arguments = &.{.integer} };
 
+    fn underline_cursel_with_char(self: *Self, root_: Buffer.Root, cursel: *CurSel, allocator: Allocator, ctx: command.Context) error{Stop}!Buffer.Root {
+        var symbol: []const u8 = undefined;
+        var mode: enum { solid, space } = .space;
+        if (!(ctx.args.match(.{tp.extract(&symbol)}) catch return error.Stop) and
+            !(ctx.args.match(.{ tp.extract(&symbol), tp.extract(&mode) }) catch return error.Stop))
+            return error.Stop;
+        var root = root_;
+        const sel: Selection = if (cursel.selection) |sel_| sel_ else Selection.line_from_cursor(cursel.cursor, root, self.metrics);
+        var sfa = std.heap.stackFallback(4096, self.allocator);
+        const sfa_allocator = sfa.get();
+        const text = copy_selection(root, sel, sfa_allocator, self.metrics) catch return error.Stop;
+        defer sfa_allocator.free(text);
+
+        var underlined: std.Io.Writer.Allocating = .init(sfa_allocator);
+        defer underlined.deinit();
+
+        var text_egcs = text;
+        while (text_egcs.len > 0) {
+            var colcount: c_int = 1;
+            const egc_len = self.metrics.egc_length(self.metrics, text_egcs, &colcount, 0);
+            switch (text_egcs[0]) {
+                '\t' => underlined.writer.writeAll("\t") catch {},
+                '\n' => underlined.writer.writeAll(text_egcs[0..egc_len]) catch {},
+                ' ' => underlined.writer.writeAll(switch (mode) {
+                    .space => text_egcs[0..egc_len],
+                    .solid => symbol,
+                }) catch {},
+                else => while (colcount > 0) : (colcount -= 1) underlined.writer.writeAll(symbol) catch {},
+            }
+            text_egcs = text_egcs[egc_len..];
+        }
+
+        cursel.cursor = sel.end;
+        if (cursel.selection) |_| {
+            cursel.disable_selection(root, self.metrics);
+        } else {
+            var test_eof = sel.end;
+            test_eof.move_right(root, self.metrics) catch { // test for EOF
+                root = self.insert(root, cursel, "\n", allocator) catch return error.Stop;
+            };
+        }
+        root = self.insert(root, cursel, underlined.written(), allocator) catch return error.Stop;
+        cursel.selection = .{ .begin = sel.end, .end = cursel.cursor };
+        return root;
+    }
+
+    pub fn underline_with_char(self: *Self, ctx: Context) Result {
+        const b = try self.buf_for_update();
+        const root = try self.with_cursels_mut_once_arg(b.root, underline_cursel_with_char, b.allocator, ctx);
+        try self.update_buf(root);
+        self.clamp();
+    }
+    pub const underline_with_char_meta: Meta = .{ .arguments = &.{.string} };
+
     fn toggle_cursel_prefix(self: *Self, root_: Buffer.Root, cursel: *CurSel, allocator: Allocator) error{Stop}!Buffer.Root {
         var root = root_;
         const saved = cursel.*;
diff --git a/src/tui/mode/mini/get_char.zig b/src/tui/mode/mini/get_char.zig
new file mode 100644
index 0000000..379acd4
--- /dev/null
+++ b/src/tui/mode/mini/get_char.zig
@@ -0,0 +1,92 @@
+const std = @import("std");
+const tp = @import("thespian");
+
+const input = @import("input");
+const key = @import("renderer").input.key;
+const mod = @import("renderer").input.modifier;
+const event_type = @import("renderer").input.event_type;
+const keybind = @import("keybind");
+const command = @import("command");
+const EventHandler = @import("EventHandler");
+
+const tui = @import("../../tui.zig");
+
+const Allocator = @import("std").mem.Allocator;
+const fmt = @import("std").fmt;
+
+pub fn Create(options: type) type {
+    return struct {
+        const Self = @This();
+
+        const Commands = command.Collection(cmds);
+
+        const ValueType = if (@hasDecl(options, "ValueType")) options.ValueType else void;
+
+        allocator: Allocator,
+        input: ?ValueType = null,
+        value: ValueType,
+        ctx: command.Context,
+        commands: Commands = undefined,
+
+        pub fn create(allocator: Allocator, ctx: command.Context) !struct { tui.Mode, tui.MiniMode } {
+            const self = try allocator.create(Self);
+            errdefer allocator.destroy(self);
+            self.* = .{
+                .allocator = allocator,
+                .ctx = .{ .args = try ctx.args.clone(allocator) },
+                .value = if (@hasDecl(options, "start")) options.start(self) else {},
+            };
+            try self.commands.init(self);
+            var mode = try keybind.mode("mini/get_char", allocator, .{
+                .insert_command = "mini_mode_insert_bytes",
+            });
+            mode.event_handler = EventHandler.to_owned(self);
+            return .{ mode, .{ .name = options.name(self) } };
+        }
+
+        pub fn deinit(self: *Self) void {
+            if (@hasDecl(options, "deinit"))
+                options.deinit(self);
+            self.allocator.free(self.ctx.args.buf);
+            self.commands.deinit();
+            self.allocator.destroy(self);
+        }
+
+        pub fn receive(_: *Self, _: tp.pid_ref, _: tp.message) error{Exit}!bool {
+            return false;
+        }
+
+        const cmds = struct {
+            pub const Target = Self;
+            const Ctx = command.Context;
+            const Meta = command.Metadata;
+            const Result = command.Result;
+
+            pub fn mini_mode_insert_code_point(self: *Self, ctx: Ctx) Result {
+                var code_point: u32 = 0;
+                if (!try ctx.args.match(.{tp.extract(&code_point)}))
+                    return error.InvalidMoveToCharInsertCodePointArgument;
+                var buf: [6]u8 = undefined;
+                const bytes = input.ucs32_to_utf8(&[_]u32{code_point}, &buf) catch return error.InvalidMoveToCharCodePoint;
+                return options.process_egc(self, buf[0..bytes]);
+            }
+            pub const mini_mode_insert_code_point_meta: Meta = .{ .arguments = &.{.integer} };
+
+            pub fn mini_mode_insert_bytes(self: *Self, ctx: Ctx) Result {
+                var bytes: []const u8 = undefined;
+                if (!try ctx.args.match(.{tp.extract(&bytes)}))
+                    return error.InvalidMoveToCharInsertBytesArgument;
+                const egc = tui.egc_last(bytes);
+                var buf: [6]u8 = undefined;
+                @memcpy(buf[0..egc.len], egc);
+                return options.process_egc(self, buf[0..egc.len]);
+            }
+            pub const mini_mode_insert_bytes_meta: Meta = .{ .arguments = &.{.string} };
+
+            pub fn mini_mode_cancel(_: *Self, _: Ctx) Result {
+                command.executeName("exit_mini_mode", .{}) catch {};
+            }
+            pub const mini_mode_cancel_meta: Meta = .{ .description = "Cancel input" };
+        };
+    };
+}
diff --git a/src/tui/mode/mini/move_to_char.zig b/src/tui/mode/mini/move_to_char.zig
index 1d76631..e9ef5f7 100644
--- a/src/tui/mode/mini/move_to_char.zig
+++ b/src/tui/mode/mini/move_to_char.zig
@@ -1,25 +1,17 @@
 const std = @import("std");
-const tp = @import("thespian");
-
-const input = @import("input");
-const keybind = @import("keybind");
+const cbor = @import("cbor");
 const command = @import("command");
-const EventHandler = @import("EventHandler");
 
 const tui = @import("../../tui.zig");
 
-const Allocator = @import("std").mem.Allocator;
+pub const Type = @import("get_char.zig").Create(@This());
+pub const create = Type.create;
 
-const Self = @This();
-
-const Commands = command.Collection(cmds);
-
-allocator: Allocator,
-key: [6]u8 = undefined,
-direction: Direction,
-operation_command: []const u8,
-operation: Operation,
-commands: Commands = undefined,
+pub const ValueType = struct {
+    direction: Direction,
+    operation_command: []const u8,
+    operation: Operation,
+};
 
 const Direction = enum {
     left,
@@ -32,9 +24,9 @@ const Operation = enum {
     extend,
 };
 
-pub fn create(allocator: Allocator, ctx: command.Context) !struct { tui.Mode, tui.MiniMode } {
-    var operation_command: []const u8 = undefined;
-    _ = ctx.args.match(.{tp.extract(&operation_command)}) catch return error.InvalidMoveToCharArgument;
+pub fn start(self: *Type) ValueType {
+    var operation_command: []const u8 = "move_to_char_left";
+    _ = self.ctx.args.match(.{cbor.extract(&operation_command)}) catch {};
 
     const direction: Direction = if (std.mem.indexOf(u8, operation_command, "_left")) |_| .left else .right;
     var operation: Operation = undefined;
@@ -50,80 +42,31 @@ pub fn create(allocator: Allocator, ctx: command.Context) !struct { tui.Mode, tu
         operation = .move;
     }
 
-    const self = try allocator.create(Self);
-    errdefer allocator.destroy(self);
-    self.* = .{
-        .allocator = allocator,
+    return .{
         .direction = direction,
-        .operation_command = try allocator.dupe(u8, operation_command),
+        .operation_command = operation_command,
         .operation = operation,
     };
-    try self.commands.init(self);
-    var mode = try keybind.mode("mini/move_to_char", allocator, .{
-        .insert_command = "mini_mode_insert_bytes",
-    });
-    mode.event_handler = EventHandler.to_owned(self);
-    return .{ mode, .{ .name = self.name() } };
 }
 
-pub fn deinit(self: *Self) void {
-    self.commands.deinit();
-    self.allocator.free(self.operation_command);
-    self.allocator.destroy(self);
-}
-
-fn name(self: *Self) []const u8 {
-    return switch (self.operation) {
-        .move => switch (self.direction) {
+pub fn name(self: *Type) []const u8 {
+    return switch (self.value.operation) {
+        .move => switch (self.value.direction) {
             .left => "↶ move",
             .right => "↷ move",
         },
-        .select => switch (self.direction) {
+        .select => switch (self.value.direction) {
             .left => "󰒅 ↶ select",
             .right => "󰒅 ↷ select",
         },
-        .extend => switch (self.direction) {
+        .extend => switch (self.value.direction) {
             .left => "󰒅 ↶ extend",
             .right => "󰒅 ↷ extend",
         },
     };
 }
 
-pub fn receive(_: *Self, _: tp.pid_ref, _: tp.message) error{Exit}!bool {
-    return false;
-}
-
-fn execute_operation(self: *Self, ctx: command.Context) command.Result {
-    try command.executeName(self.operation_command, ctx);
+pub fn process_egc(self: *Type, egc: []const u8) command.Result {
+    try command.executeName(self.value.operation_command, command.fmt(.{egc}));
     try command.executeName("exit_mini_mode", .{});
 }
-
-const cmds = struct {
-    pub const Target = Self;
-    const Ctx = command.Context;
-    const Meta = command.Metadata;
-    const Result = command.Result;
-
-    pub fn mini_mode_insert_code_point(self: *Self, ctx: Ctx) Result {
-        var code_point: u32 = 0;
-        if (!try ctx.args.match(.{tp.extract(&code_point)}))
-            return error.InvalidMoveToCharInsertCodePointArgument;
-        var buf: [6]u8 = undefined;
-        const bytes = input.ucs32_to_utf8(&[_]u32{code_point}, &buf) catch return error.InvalidMoveToCharCodePoint;
-        return self.execute_operation(command.fmt(.{buf[0..bytes]}));
-    }
-    pub const mini_mode_insert_code_point_meta: Meta = .{ .arguments = &.{.integer} };
-
-    pub fn mini_mode_insert_bytes(self: *Self, ctx: Ctx) Result {
-        var bytes: []const u8 = undefined;
-        if (!try ctx.args.match(.{tp.extract(&bytes)}))
-            return error.InvalidMoveToCharInsertBytesArgument;
-        return self.execute_operation(ctx);
-    }
-    pub const mini_mode_insert_bytes_meta: Meta = .{ .arguments = &.{.string} };
-
-    pub fn mini_mode_cancel(_: *Self, _: Ctx) Result {
-        command.executeName("exit_mini_mode", .{}) catch {};
-    }
-    pub const mini_mode_cancel_meta: Meta = .{ .description = "Cancel input" };
-};
diff --git a/src/tui/mode/mini/underline.zig b/src/tui/mode/mini/underline.zig
new file mode 100644
index 0000000..c55cd23
--- /dev/null
+++ b/src/tui/mode/mini/underline.zig
@@ -0,0 +1,17 @@
+const std = @import("std");
+const cbor = @import("cbor");
+const command = @import("command");
+
+const tui = @import("../../tui.zig");
+
+pub const Type = @import("get_char.zig").Create(@This());
+pub const create = Type.create;
+
+pub fn name(_: *Type) []const u8 {
+    return "underline";
+}
+
+pub fn process_egc(_: *Type, egc: []const u8) command.Result {
+    try command.executeName("underline_with_char", command.fmt(.{ egc, "solid" }));
+    try command.executeName("exit_mini_mode", .{});
+}
diff --git a/src/tui/tui.zig b/src/tui/tui.zig
index 45063d6..ac38613 100644
--- a/src/tui/tui.zig
+++ b/src/tui/tui.zig
@@ -1189,6 +1189,11 @@ const cmds = struct {
     }
     pub const replace_meta: Meta = .{ .description = "Replace with character" };
 
+    pub fn underline(self: *Self, ctx: Ctx) Result {
+        return enter_mini_mode(self, @import("mode/mini/underline.zig"), ctx);
+    }
+    pub const underline_meta: Meta = .{ .description = "Underline with character" };
+
     pub fn open_file(self: *Self, ctx: Ctx) Result {
         if (get_active_selection(self.allocator)) |text| {
             defer self.allocator.free(text);