Reflow text on resize

src/Buffer.test.ts

@@ -108,12 +108,12 @@ describe('Buffer', () => {
 
  describe('resize', () => {
  describe('column size is reduced', () => {
- it('should not trim the data in the buffer', () => {
+ it('should trim the data in the buffer', () => {
  buffer.fillViewportRows();
  buffer.resize(INIT_COLS / 2, INIT_ROWS);
  assert.equal(buffer.lines.length, INIT_ROWS);
  for (let i = 0; i < INIT_ROWS; i++) {
- assert.equal(buffer.lines.get(i).length, INIT_COLS);
+ assert.equal(buffer.lines.get(i).length, INIT_COLS / 2);
  }
  });
  });
@@ -233,6 +233,108 @@ describe('Buffer', () => {
  }
  });
  });
+
+ describe('reflow', () => {
+ it('should not wrap empty lines', () => {
+ buffer.fillViewportRows();
+ assert.equal(buffer.lines.length, INIT_ROWS);
+ buffer.resize(INIT_COLS - 5, INIT_ROWS);
+ assert.equal(buffer.lines.length, INIT_ROWS);
+ });
+ it('should shrink row length', () => {
+ buffer.fillViewportRows();
+ buffer.resize(5, 10);
+ assert.equal(buffer.lines.length, 10);
+ assert.equal(buffer.lines.get(0).length, 5);
+ assert.equal(buffer.lines.get(1).length, 5);
+ assert.equal(buffer.lines.get(2).length, 5);
+ assert.equal(buffer.lines.get(3).length, 5);
+ assert.equal(buffer.lines.get(4).length, 5);
+ assert.equal(buffer.lines.get(5).length, 5);
+ assert.equal(buffer.lines.get(6).length, 5);
+ assert.equal(buffer.lines.get(7).length, 5);
+ assert.equal(buffer.lines.get(8).length, 5);
+ assert.equal(buffer.lines.get(9).length, 5);
+ });
+ it('should wrap and unwrap lines', () => {
+ buffer.fillViewportRows();
+ buffer.resize(5, 10);
+ const firstLine = buffer.lines.get(0);
+ for (let i = 0; i < 5; i++) {
+ const code = 'a'.charCodeAt(0) + i;
+ const char = String.fromCharCode(code);
+ firstLine.set(i, [null, char, 1, code]);
+ }
+ assert.equal(buffer.lines.get(0).length, 5);
+ assert.equal(buffer.lines.get(0).translateToString(), 'abcde');
+ buffer.resize(1, 10);
+ assert.equal(buffer.lines.length, 10);
+ assert.equal(buffer.lines.get(0).translateToString(), 'a');
+ assert.equal(buffer.lines.get(1).translateToString(), 'b');
+ assert.equal(buffer.lines.get(2).translateToString(), 'c');
+ assert.equal(buffer.lines.get(3).translateToString(), 'd');
+ assert.equal(buffer.lines.get(4).translateToString(), 'e');
+ assert.equal(buffer.lines.get(5).translateToString(), ' ');
+ assert.equal(buffer.lines.get(6).translateToString(), ' ');
+ assert.equal(buffer.lines.get(7).translateToString(), ' ');
+ assert.equal(buffer.lines.get(8).translateToString(), ' ');
+ assert.equal(buffer.lines.get(9).translateToString(), ' ');
+ buffer.resize(5, 10);
+ assert.equal(buffer.lines.length, 10);
+ assert.equal(buffer.lines.get(0).translateToString(), 'abcde');
+ assert.equal(buffer.lines.get(1).translateToString(), ' ');
+ assert.equal(buffer.lines.get(2).translateToString(), ' ');
+ assert.equal(buffer.lines.get(3).translateToString(), ' ');
+ assert.equal(buffer.lines.get(4).translateToString(), ' ');
+ assert.equal(buffer.lines.get(5).translateToString(), ' ');
+ assert.equal(buffer.lines.get(6).translateToString(), ' ');
+ assert.equal(buffer.lines.get(7).translateToString(), ' ');
+ assert.equal(buffer.lines.get(8).translateToString(), ' ');
+ assert.equal(buffer.lines.get(9).translateToString(), ' ');
+ });
+ it('should discard parts of wrapped lines that go out of the scrollback', () => {
+ buffer.fillViewportRows();
+ terminal.options.scrollback = 1;
+ buffer.resize(10, 5);
+ const lastLine = buffer.lines.get(4);
+ for (let i = 0; i < 10; i++) {
+ const code = 'a'.charCodeAt(0) + i;
+ const char = String.fromCharCode(code);
+ lastLine.set(i, [null, char, 1, code]);
+ }
+ assert.equal(buffer.lines.length, 5);
+ buffer.y = 4;
+ buffer.resize(2, 5);
+ assert.equal(buffer.y, 4);
+ assert.equal(buffer.ybase, 1);
+ assert.equal(buffer.lines.length, 6);
+ assert.equal(buffer.lines.get(0).translateToString(), ' ');
+ assert.equal(buffer.lines.get(1).translateToString(), 'ab');
+ assert.equal(buffer.lines.get(2).translateToString(), 'cd');
+ assert.equal(buffer.lines.get(3).translateToString(), 'ef');
+ assert.equal(buffer.lines.get(4).translateToString(), 'gh');
+ assert.equal(buffer.lines.get(5).translateToString(), 'ij');
+ buffer.resize(1, 5);
+ assert.equal(buffer.y, 4);
+ assert.equal(buffer.ybase, 1);
+ assert.equal(buffer.lines.length, 6);
+ assert.equal(buffer.lines.get(0).translateToString(), 'e');
+ assert.equal(buffer.lines.get(1).translateToString(), 'f');
+ assert.equal(buffer.lines.get(2).translateToString(), 'g');
+ assert.equal(buffer.lines.get(3).translateToString(), 'h');
+ assert.equal(buffer.lines.get(4).translateToString(), 'i');
+ assert.equal(buffer.lines.get(5).translateToString(), 'j');
+ buffer.resize(10, 5);
+ assert.equal(buffer.y, 0);
+ assert.equal(buffer.ybase, 0);
+ assert.equal(buffer.lines.length, 5);
+ assert.equal(buffer.lines.get(0).translateToString(), 'efghij ');
+ assert.equal(buffer.lines.get(1).translateToString(), ' ');
+ assert.equal(buffer.lines.get(2).translateToString(), ' ');
+ assert.equal(buffer.lines.get(3).translateToString(), ' ');
+ assert.equal(buffer.lines.get(4).translateToString(), ' ');
+ });
+ });
  });
 
  describe('buffer marked to have no scrollback', () => {