window: add print method
Add a print method with multiple print options Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
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Tim Culverhouse
parent
2fab89f2cb
commit
e281a67a43
1 changed files with 123 additions and 46 deletions
169
src/Window.zig
169
src/Window.zig
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@ -108,54 +108,131 @@ pub fn showCursor(self: Window, col: usize, row: usize) void {
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self.screen.cursor_col = col + self.x_off;
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}
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/// Options to use when printing Segments to a window
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pub const PrintOptions = struct {
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/// vertical offset to start printing at
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row_offset: usize = 0,
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/// wrap behavior for printing
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wrap: enum {
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/// wrap at grapheme boundaries
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grapheme,
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/// wrap at word boundaries
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word,
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/// stop printing after one line
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none,
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} = .grapheme,
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};
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/// prints segments to the window. returns true if the text overflowed with the
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/// given wrap strategy and size.
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pub fn print(self: Window, segments: []Segment, opts: PrintOptions) !bool {
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var row = opts.row_offset;
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switch (opts.wrap) {
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.grapheme => {
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var col: usize = 0;
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for (segments) |segment| {
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var iter = GraphemeIterator.init(segment.text);
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while (iter.next()) |grapheme| {
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if (col >= self.width) {
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row += 1;
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col = 0;
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}
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if (row >= self.height) return true;
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const s = grapheme.slice(segment.text);
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if (std.mem.eql(u8, s, "\n")) {
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row += 1;
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col = 0;
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continue;
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}
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const w = self.gwidth(s);
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self.writeCell(col, row, .{
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.char = .{
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.grapheme = s,
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.width = w,
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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 += w;
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}
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}
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},
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.word => {
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var col: usize = 0;
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var wrapped: bool = false;
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for (segments) |segment| {
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var word_iter = try WordIterator.init(segment.text);
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while (word_iter.next()) |word| {
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// break lines when we need
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if (word.bytes[0] == '\r' or word.bytes[0] == '\n') {
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row += 1;
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col = 0;
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wrapped = false;
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continue;
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}
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// break lines when we can't fit this word, and the word isn't longer
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// than our width
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const word_width = self.gwidth(word.bytes);
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if (word_width + col >= self.width and word_width < self.width) {
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row += 1;
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col = 0;
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wrapped = true;
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}
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if (row >= self.height) return true;
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// don't print whitespace in the first column, unless we had a hard
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// break
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if (col == 0 and std.mem.eql(u8, word.bytes, " ") and wrapped) continue;
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var iter = GraphemeIterator.init(word.bytes);
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while (iter.next()) |grapheme| {
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if (col >= self.width) {
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row += 1;
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col = 0;
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wrapped = true;
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}
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const s = grapheme.slice(word.bytes);
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const w = self.gwidth(s);
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self.writeCell(col, row, .{
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.char = .{
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.grapheme = s,
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.width = w,
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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 += w;
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}
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}
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}
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},
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.none => {
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var col: usize = 0;
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for (segments) |segment| {
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var iter = GraphemeIterator.init(segment.text);
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while (iter.next()) |grapheme| {
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if (col >= self.width) return true;
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const s = grapheme.slice(segment.text);
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if (std.mem.eql(u8, s, "\n")) return true;
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const w = self.gwidth(s);
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self.writeCell(col, row, .{
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.char = .{
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.grapheme = s,
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.width = w,
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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 += w;
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}
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}
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},
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}
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return false;
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}
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/// prints text in the window with simple word wrapping.
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pub fn wrap(self: Window, segments: []Segment) !void {
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// pub fn wrap(self: Window, str: []const u8) !void {
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var row: usize = 0;
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var col: usize = 0;
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var wrapped: bool = false;
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for (segments) |segment| {
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var word_iter = try WordIterator.init(segment.text);
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while (word_iter.next()) |word| {
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// break lines when we need
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if (word.bytes[0] == '\r' or word.bytes[0] == '\n') {
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row += 1;
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col = 0;
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wrapped = false;
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continue;
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}
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// break lines when we can't fit this word, and the word isn't longer
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// than our width
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const word_width = self.gwidth(word.bytes);
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if (word_width + col >= self.width and word_width < self.width) {
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row += 1;
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col = 0;
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wrapped = true;
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}
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// don't print whitespace in the first column, unless we had a hard
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// break
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if (col == 0 and std.mem.eql(u8, word.bytes, " ") and wrapped) continue;
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var iter = GraphemeIterator.init(word.bytes);
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while (iter.next()) |grapheme| {
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if (col >= self.width) {
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row += 1;
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col = 0;
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wrapped = true;
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}
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const s = grapheme.slice(word.bytes);
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const w = self.gwidth(s);
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self.writeCell(col, row, .{
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.char = .{
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.grapheme = s,
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.width = w,
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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 += w;
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}
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}
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}
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return self.print(segments, .{ .wrap = .word });
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}
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test "Window size set" {
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