window: fix word wrapping
This commit is contained in:
Tim Culverhouse
parent
cde945f2ef
commit
bb277b8e37
1 changed files with 144 additions and 44 deletions
154
src/Window.zig
154
src/Window.zig
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@ -306,37 +306,57 @@ pub fn print(self: Window, segments: []Segment, opts: PrintOptions) !PrintResult
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},
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.word => {
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var col: usize = 0;
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const overflow: bool = blk: for (segments) |segment| {
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var line_iter = std.mem.tokenizeAny(u8, segment.text, "\r\n");
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while (line_iter.next()) |line| {
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col = 0;
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defer row += 1;
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var word_iter = std.mem.tokenizeScalar(u8, line, ' ');
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while (word_iter.next()) |word| {
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var overflow: bool = false;
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var soft_wrapped: bool = false;
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for (segments) |segment| {
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var start: usize = 0;
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var i: usize = 0;
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while (i < segment.text.len) : (i += 1) {
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// for (segment.text, 0..) |b, i| {
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const b = segment.text[i];
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const end = switch (b) {
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' ',
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'\r',
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'\n',
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=> i,
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else => if (i != segment.text.len - 1) continue else i + 1,
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};
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const word = segment.text[start..end];
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// find the start of the next word
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start = while (i + 1 < segment.text.len) : (i += 1) {
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if (segment.text[i + 1] == ' ') continue;
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break i + 1;
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} else i;
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const width = self.gwidth(word);
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if (width == 0) continue;
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// only wrap when the word can fit by itself on a
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// line
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if (width + col + 1 > self.width and width < self.width) {
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const non_wsp_width: usize = for (word, 0..) |wb, wi| {
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if (wb == '\r' or wb == '\n') {
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row += 1;
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col = 0;
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break width -| wi -| 1;
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}
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if (row >= self.height)
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break :blk true;
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if (col > 0) {
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if (opts.commit) self.writeCell(col, row, .{
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.char = .{
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.grapheme = " ",
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.width = 1,
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},
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.style = segment.style,
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.link = segment.link,
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});
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col += 1;
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if (wb != ' ') break width - wi;
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} else 0;
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if (width + col > self.width and non_wsp_width < self.width) {
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// wrap
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row += 1;
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col = 0;
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soft_wrapped = true;
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}
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var iter = GraphemeIterator.init(word);
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if (row >= self.height) {
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overflow = true;
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break;
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}
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// if we are soft wrapped, (col == 0 and row > 0), then trim
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// leading spaces
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const printed_word = if (soft_wrapped)
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std.mem.trimLeft(u8, word, " ")
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else
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word;
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defer soft_wrapped = false;
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var iter = GraphemeIterator.init(printed_word);
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while (iter.next()) |grapheme| {
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const s = grapheme.slice(word);
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const s = grapheme.slice(printed_word);
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const w = self.gwidth(s);
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if (opts.commit) self.writeCell(col, row, .{
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.char = .{
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@ -352,12 +372,33 @@ pub fn print(self: Window, segments: []Segment, opts: PrintOptions) !PrintResult
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col = 0;
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}
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}
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switch (b) {
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' ' => {
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if (col > 0) {
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if (opts.commit) self.writeCell(col, row, .{
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.char = .{
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.grapheme = " ",
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.width = 1,
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},
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.style = segment.style,
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.link = segment.link,
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});
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col += 1;
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}
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},
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'\r',
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'\n',
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=> {
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col = 0;
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row += 1;
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},
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else => {},
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}
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}
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}
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} else false;
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return .{
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// remove last row counter
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.row = row - 1,
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.row = row,
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.col = col,
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.overflow = overflow,
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};
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@ -625,4 +666,63 @@ test "print: word" {
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try std.testing.expectEqual(2, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "h" },
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.{ .text = "e" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(2, result.col);
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try std.testing.expectEqual(0, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "h" },
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.{ .text = "e" },
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.{ .text = "l" },
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.{ .text = "l" },
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.{ .text = "o" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(1, result.col);
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try std.testing.expectEqual(1, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "he\n" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(0, result.col);
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try std.testing.expectEqual(1, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "he\n\n" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(0, result.col);
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try std.testing.expectEqual(2, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "not now" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(3, result.col);
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try std.testing.expectEqual(1, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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{
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var segments = [_]Segment{
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.{ .text = "note now" },
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};
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const result = try win.print(&segments, opts);
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try std.testing.expectEqual(3, result.col);
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try std.testing.expectEqual(1, result.row);
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try std.testing.expectEqual(false, result.overflow);
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}
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}
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