feat: add support for byte offsets in file links to navigate command

This adds support for using `+b{offset}` on the command line.

src/buffer/Buffer.zig

@@ -794,6 +794,35 @@ const Node = union(enum) {
         return if (found) ctx.result else error.NotFound;
     }
 
+    pub fn byte_offset_to_line_and_col(self: *const Node, pos: usize, metrics: Metrics, eol_mode: EolMode) Cursor {
+        const ctx_ = struct {
+            pos: usize,
+            line: usize = 0,
+            col: usize = 0,
+            eol_mode: EolMode,
+            fn walker(ctx_: *anyopaque, egc: []const u8, wcwidth: usize, _: Metrics) Walker {
+                const ctx = @as(*@This(), @ptrCast(@alignCast(ctx_)));
+                if (egc[0] == '\n') {
+                    ctx.pos -= switch (ctx.eol_mode) {
+                        .lf => 1,
+                        .crlf => @min(2, ctx.pos),
+                    };
+                    if (ctx.pos == 0) return Walker.stop;
+                    ctx.line += 1;
+                    ctx.col = 0;
+                } else {
+                    ctx.pos -= @min(egc.len, ctx.pos);
+                    if (ctx.pos == 0) return Walker.stop;
+                    ctx.col += wcwidth;
+                }
+                return Walker.keep_walking;
+            }
+        };
+        var ctx: ctx_ = .{ .pos = pos + 1, .eol_mode = eol_mode };
+        self.walk_egc_forward(0, ctx_.walker, &ctx, metrics) catch {};
+        return .{ .row = ctx.line, .col = ctx.col };
+    }
+
     pub fn insert_chars(
         self_: *const Node,
         line_: usize,

src/file_link.zig

@@ -13,6 +13,7 @@ pub const FileDest = struct {
     column: ?usize = null,
     end_column: ?usize = null,
     exists: bool = false,
+    offset: ?usize = null,
 };
 
 pub const DirDest = struct {
@@ -37,11 +38,17 @@ pub fn parse(link: []const u8) error{InvalidFileLink}!Dest {
         .{ .file = .{ .path = it.first() } };
     switch (dest) {
         .file => |*file| {
-            if (it.next()) |line_|
+            if (it.next()) |line_| if (line_.len > 0 and line_[0] == 'b') {
+                file.offset = std.fmt.parseInt(usize, line_[1..], 10) catch blk: {
+                    file.path = link;
+                    break :blk null;
+                };
+            } else {
                 file.line = std.fmt.parseInt(usize, line_, 10) catch blk: {
                     file.path = link;
                     break :blk null;
                 };
+            };
             if (file.line) |_| if (it.next()) |col_| {
                 file.column = std.fmt.parseInt(usize, col_, 10) catch null;
             };
@@ -88,6 +95,9 @@ pub fn parse_bracket_link(link: []const u8) error{InvalidFileLink}!Dest {
 pub fn navigate(to: tp.pid_ref, link: *const Dest) anyerror!void {
     switch (link.*) {
         .file => |file| {
+            if (file.offset) |offset| {
+                return to.send(.{ "cmd", "navigate", .{ .file = file.path, .offset = offset } });
+            }
             if (file.line) |l| {
                 if (file.column) |col| {
                     try to.send(.{ "cmd", "navigate", .{ .file = file.path, .line = l, .column = col } });

src/keybind/builtin/flow.json

@@ -341,6 +341,7 @@
     },
     "mini/numeric": {
         "press": [
+            ["b", "goto_offset"],
             ["ctrl+q", "quit"],
             ["ctrl+v", "system_paste"],
             ["ctrl+u", "mini_mode_reset"],

src/main.zig

@@ -245,10 +245,23 @@ pub fn main() anyerror!void {
     defer links.deinit();
     var prev: ?*file_link.Dest = null;
     var line_next: ?usize = null;
+    var offset_next: ?usize = null;
     for (positional_args.items) |arg| {
         if (arg.len == 0) continue;
 
         if (!args.literal and arg[0] == '+') {
+            if (arg.len > 2 and arg[1] == 'b') {
+                const offset = try std.fmt.parseInt(usize, arg[2..], 10);
+                if (prev) |p| switch (p.*) {
+                    .file => |*file| {
+                        file.offset = offset;
+                        continue;
+                    },
+                    else => {},
+                };
+                offset_next = offset;
+                line_next = null;
+            } else {
                 const line = try std.fmt.parseInt(usize, arg[1..], 10);
                 if (prev) |p| switch (p.*) {
                     .file => |*file| {
@@ -258,6 +271,8 @@ pub fn main() anyerror!void {
                     else => {},
                 };
                 line_next = line;
+                offset_next = null;
+            }
             continue;
         }
 
@@ -274,6 +289,15 @@ pub fn main() anyerror!void {
                 else => {},
             }
         }
+        if (offset_next) |offset| {
+            switch (curr.*) {
+                .file => |*file| {
+                    file.offset = offset;
+                    offset_next = null;
+                },
+                else => {},
+            }
+        }
     }
 
     var have_project = false;

src/tui/editor.zig

@@ -5477,6 +5477,28 @@ pub const Editor = struct {
     }
     pub const goto_line_and_column_meta: Meta = .{ .arguments = &.{ .integer, .integer } };
 
+    pub fn goto_byte_offset(self: *Self, ctx: Context) Result {
+        try self.send_editor_jump_source();
+        var offset: usize = 0;
+        if (try ctx.args.match(.{
+            tp.extract(&offset),
+        })) {
+            // self.logger.print("goto: byte offset:{d}", .{ offset });
+        } else return error.InvalidGotoByteOffsetArgument;
+        self.cancel_all_selections();
+        const root = self.buf_root() catch return;
+        const eol_mode = self.buf_eol_mode() catch return;
+        const primary = self.get_primary();
+        primary.cursor = root.byte_offset_to_line_and_col(offset, self.metrics, eol_mode);
+        if (self.view.is_visible(&primary.cursor))
+            self.clamp()
+        else
+            try self.scroll_view_center(.{});
+        try self.send_editor_jump_destination();
+        self.need_render();
+    }
+    pub const goto_byte_offset_meta: Meta = .{ .arguments = &.{.integer} };
+
     pub fn goto_definition(self: *Self, _: Context) Result {
         const file_path = self.file_path orelse return;
         const primary = self.get_primary();

src/tui/mainview.zig

@@ -150,10 +150,10 @@ pub fn receive(self: *Self, from_: tp.pid_ref, m: tp.message) error{Exit}!bool {
             });
         return true;
     } else if (try m.match(.{ "navigate_complete", tp.extract(&same_file), tp.extract(&path), tp.extract(&goto_args), tp.extract(&line), tp.extract(&column) })) {
-        cmds.navigate_complete(self, same_file, path, goto_args, line, column) catch |e| return tp.exit_error(e, @errorReturnTrace());
+        cmds.navigate_complete(self, same_file, path, goto_args, line, column, null) catch |e| return tp.exit_error(e, @errorReturnTrace());
         return true;
     } else if (try m.match(.{ "navigate_complete", tp.extract(&same_file), tp.extract(&path), tp.extract(&goto_args), tp.null_, tp.null_ })) {
-        cmds.navigate_complete(self, same_file, path, goto_args, null, null) catch |e| return tp.exit_error(e, @errorReturnTrace());
+        cmds.navigate_complete(self, same_file, path, goto_args, null, null, null) catch |e| return tp.exit_error(e, @errorReturnTrace());
         return true;
     }
     return if (try self.floating_views.send(from_, m)) true else self.widgets.send(from_, m);
@@ -349,6 +349,7 @@ const cmds = struct {
         var file_name: []const u8 = undefined;
         var line: ?i64 = null;
         var column: ?i64 = null;
+        var offset: ?i64 = null;
         var goto_args: []const u8 = &.{};
 
         var iter = ctx.args.buf;
@@ -370,6 +371,9 @@ const cmds = struct {
                 } else if (std.mem.eql(u8, field_name, "goto")) {
                     if (!try cbor.matchValue(&iter, cbor.extract_cbor(&goto_args)))
                         return error.InvalidNavigateGotoArgument;
+                } else if (std.mem.eql(u8, field_name, "offset")) {
+                    if (!try cbor.matchValue(&iter, cbor.extract(&offset)))
+                        return error.InvalidNavigateOffsetArgument;
                 } else {
                     try cbor.skipValue(&iter);
                 }
@@ -392,7 +396,8 @@ const cmds = struct {
         if (tui.config().restore_last_cursor_position and
             !same_file and
             !have_editor_metadata and
-            line == null)
+            line == null and
+            offset == null)
         {
             const ctx_: struct {
                 allocator: std.mem.Allocator,
@@ -424,11 +429,11 @@ const cmds = struct {
             return;
         }
 
-        return cmds.navigate_complete(self, same_file, f, goto_args, line, column);
+        return cmds.navigate_complete(self, same_file, f, goto_args, line, column, offset);
     }
     pub const navigate_meta: Meta = .{ .arguments = &.{.object} };
 
-    fn navigate_complete(self: *Self, same_file: bool, f: []const u8, goto_args: []const u8, line: ?i64, column: ?i64) Result {
+    fn navigate_complete(self: *Self, same_file: bool, f: []const u8, goto_args: []const u8, line: ?i64, column: ?i64, offset: ?i64) Result {
         if (!same_file) {
             if (self.get_active_editor()) |editor| {
                 editor.send_editor_jump_source() catch {};
@@ -444,6 +449,10 @@ const cmds = struct {
                 try command.executeName("scroll_view_center", .{});
             if (column) |col|
                 try command.executeName("goto_column", command.fmt(.{col}));
+        } else if (offset) |o| {
+            try command.executeName("goto_byte_offset", command.fmt(.{o}));
+            if (!same_file)
+                try command.executeName("scroll_view_center", .{});
         }
         tui.need_render();
     }

src/tui/mode/mini/goto_offset.zig

@@ -0,0 +1,58 @@
+const fmt = @import("std").fmt;
+const command = @import("command");
+
+const tui = @import("../../tui.zig");
+const Cursor = @import("../../editor.zig").Cursor;
+
+pub const Type = @import("numeric_input.zig").Create(@This());
+pub const create = Type.create;
+
+pub const ValueType = struct {
+    cursor: Cursor = .{},
+    offset: usize = 0,
+};
+
+pub fn name(_: *Type) []const u8 {
+    return "＃goto byte";
+}
+
+pub fn start(_: *Type) ValueType {
+    const editor = tui.get_active_editor() orelse return .{};
+    return .{ .cursor = editor.get_primary().cursor };
+}
+
+pub fn process_digit(self: *Type, digit: u8) void {
+    switch (digit) {
+        0...9 => {
+            if (self.input) |*input| {
+                input.offset = input.offset * 10 + digit;
+            } else {
+                self.input = .{ .offset = digit };
+            }
+        },
+        else => unreachable,
+    }
+}
+
+pub fn delete(self: *Type, input: *ValueType) void {
+    const newval = if (input.offset < 10) 0 else input.offset / 10;
+    if (newval == 0) self.input = null else input.offset = newval;
+}
+
+pub fn format_value(_: *Type, input_: ?ValueType, buf: []u8) []const u8 {
+    return if (input_) |input|
+        fmt.bufPrint(buf, "{d}", .{input.offset}) catch ""
+    else
+        "";
+}
+
+pub const preview = goto;
+pub const apply = goto;
+pub const cancel = goto;
+
+fn goto(self: *Type, _: command.Context) void {
+    if (self.input) |input|
+        command.executeName("goto_byte_offset", command.fmt(.{input.offset})) catch {}
+    else
+        command.executeName("goto_line_and_column", command.fmt(.{ self.start.cursor.row, self.start.cursor.col })) catch {};
+}

src/tui/tui.zig

@@ -1038,6 +1038,11 @@ const cmds = struct {
     }
     pub const goto_meta: Meta = .{ .description = "Goto line" };
 
+    pub fn goto_offset(self: *Self, ctx: Ctx) Result {
+        return enter_mini_mode(self, @import("mode/mini/goto_offset.zig"), ctx);
+    }
+    pub const goto_offset_meta: Meta = .{ .description = "Goto byte offset" };
+
     pub fn move_to_char(self: *Self, ctx: Ctx) Result {
         return enter_mini_mode(self, @import("mode/mini/move_to_char.zig"), ctx);
     }

test/tests_buffer.zig

@@ -190,6 +190,14 @@ test "get_byte_pos" {
     try std.testing.expectEqual(33, try buffer.root.get_byte_pos(.{ .row = 4, .col = 0 }, metrics(), eol_mode));
     try std.testing.expectEqual(66, try buffer.root.get_byte_pos(.{ .row = 8, .col = 0 }, metrics(), eol_mode));
     try std.testing.expectEqual(97, try buffer.root.get_byte_pos(.{ .row = 11, .col = 2 }, metrics(), eol_mode));
+
+    eol_mode = .crlf;
+    try std.testing.expectEqual(0, try buffer.root.get_byte_pos(.{ .row = 0, .col = 0 }, metrics(), eol_mode));
+    try std.testing.expectEqual(10, try buffer.root.get_byte_pos(.{ .row = 1, .col = 0 }, metrics(), eol_mode));
+    try std.testing.expectEqual(12, try buffer.root.get_byte_pos(.{ .row = 1, .col = 2 }, metrics(), eol_mode));
+    try std.testing.expectEqual(37, try buffer.root.get_byte_pos(.{ .row = 4, .col = 0 }, metrics(), eol_mode));
+    try std.testing.expectEqual(74, try buffer.root.get_byte_pos(.{ .row = 8, .col = 0 }, metrics(), eol_mode));
+    try std.testing.expectEqual(108, try buffer.root.get_byte_pos(.{ .row = 11, .col = 2 }, metrics(), eol_mode));
 }
 
 test "delete_bytes" {
@@ -406,3 +414,44 @@ test "get_from_pos" {
     const result3 = buffer.root.get_from_pos(.{ .row = 1, .col = 5 }, &result_buf, metrics());
     try std.testing.expectEqualDeep(result3[0 .. line1.len - 4], line1[4..]);
 }
+
+test "byte_offset_to_line_and_col" {
+    const doc: []const u8 =
+        \\All your
+        \\ropes
+        \\are belong to
+        \\us!
+        \\All your
+        \\ropes
+        \\are belong to
+        \\us!
+        \\All your
+        \\ropes
+        \\are belong to
+        \\us!
+    ;
+    var eol_mode: Buffer.EolMode = .lf;
+    var sanitized: bool = false;
+    const buffer = try Buffer.create(a);
+    defer buffer.deinit();
+    buffer.update(try buffer.load_from_string(doc, &eol_mode, &sanitized));
+
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 0 }, buffer.root.byte_offset_to_line_and_col(0, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(8, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 0 }, buffer.root.byte_offset_to_line_and_col(9, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 2 }, buffer.root.byte_offset_to_line_and_col(11, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 4, .col = 0 }, buffer.root.byte_offset_to_line_and_col(33, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 8, .col = 0 }, buffer.root.byte_offset_to_line_and_col(66, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 11, .col = 2 }, buffer.root.byte_offset_to_line_and_col(97, metrics(), eol_mode));
+
+    eol_mode = .crlf;
+
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 0 }, buffer.root.byte_offset_to_line_and_col(0, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(8, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 0, .col = 8 }, buffer.root.byte_offset_to_line_and_col(9, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 0 }, buffer.root.byte_offset_to_line_and_col(10, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 1, .col = 2 }, buffer.root.byte_offset_to_line_and_col(12, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 4, .col = 0 }, buffer.root.byte_offset_to_line_and_col(37, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 8, .col = 0 }, buffer.root.byte_offset_to_line_and_col(74, metrics(), eol_mode));
+    try std.testing.expectEqual(Buffer.Cursor{ .row = 11, .col = 2 }, buffer.root.byte_offset_to_line_and_col(108, metrics(), eol_mode));
+}