1package tui
2
3import (
4 "bytes"
5 "strings"
6 "testing"
7)
8
9// TestDrawLogIdleNoOpEmitsNothing pins the cursor-blink fix: when
10// DrawLog is called with the exact same buffer and cursor position
11// as the previous call, it must emit ZERO bytes.
12//
13// The bug this regresses: at the 120ms animation tick the renderer
14// used to always emit SeqHideCursor + cursor-position +
15// SeqShowCursor, which resets the terminal's blink timer. Faster
16// than the OS blink interval, so an idle dialog editor (e.g. a
17// re-opened swarm transcript whose agent isn't producing output)
18// rendered the caret as a solid non-blinking block.
19//
20// With the no-op fast path the renderer leaves the screen alone
21// on idle frames, letting the terminal run its own blink cycle.
22func TestDrawLogIdleNoOpEmitsNothing(t *testing.T) {
23 var buf bytes.Buffer
24 r := NewRenderer(&buf)
25 r.Resize(80, 24)
26
27 chat := []string{"hello", "world"}
28 bottom := []string{"▌ "}
29 // First draw populates the renderer's cached buffer.
30 r.DrawLog(chat, bottom, 0, 2)
31 first := buf.Len()
32 if first == 0 {
33 t.Fatal("first DrawLog wrote nothing; setup is broken")
34 }
35 buf.Reset()
36
37 // Identical second draw: same content, same cursor placement.
38 r.DrawLog(chat, bottom, 0, 2)
39 if buf.Len() != 0 {
40 t.Fatalf("idle re-draw emitted %d bytes; expected 0 so terminal blink keeps ticking\n%q",
41 buf.Len(), buf.String())
42 }
43}
44
45// TestDrawLogContentChangeBreaksFastPath proves the no-op fast path
46// only fires when nothing changed. A buffer mutation must still
47// produce output, otherwise streaming agent replies would freeze on
48// screen.
49func TestDrawLogContentChangeBreaksFastPath(t *testing.T) {
50 var buf bytes.Buffer
51 r := NewRenderer(&buf)
52 r.Resize(80, 24)
53
54 r.DrawLog([]string{"hello"}, []string{"▌ "}, 0, 2)
55 buf.Reset()
56
57 // New chat row lands.
58 r.DrawLog([]string{"hello", "world"}, []string{"▌ "}, 0, 2)
59 if buf.Len() == 0 {
60 t.Fatal("content change suppressed by fast path; streaming output would freeze")
61 }
62}
63
64// TestDrawLogCursorMoveBreaksFastPath proves a cursor-only change
65// (no buffer change) still produces output. Without this, typing in
66// the editor would visually move the caret but the terminal would
67// keep drawing it at the old column.
68func TestDrawLogCursorMoveBreaksFastPath(t *testing.T) {
69 var buf bytes.Buffer
70 r := NewRenderer(&buf)
71 r.Resize(80, 24)
72
73 r.DrawLog([]string{"hi"}, []string{"▌ "}, 0, 2)
74 buf.Reset()
75
76 // Same buffer, different cursor column.
77 r.DrawLog([]string{"hi"}, []string{"▌ "}, 0, 3)
78 if buf.Len() == 0 {
79 t.Fatal("cursor-only change suppressed by fast path; caret would lag behind typing")
80 }
81 // And the emitted bytes must at least reposition the cursor.
82 if !strings.Contains(buf.String(), "\x1b[") {
83 t.Errorf("cursor move emission missing CSI escapes: %q", buf.String())
84 }
85}
86
87// TestDrawLogResizeForcesFullRedraw confirms a resize invalidates
88// the cache so the next DrawLog with identical inputs still emits.
89// Resize sets logInit=false; without that, a resize followed by an
90// identical buffer would falsely no-op and leave a stale frame.
91func TestDrawLogResizeForcesFullRedraw(t *testing.T) {
92 var buf bytes.Buffer
93 r := NewRenderer(&buf)
94 r.Resize(80, 24)
95 r.DrawLog([]string{"hi"}, []string{"▌ "}, 0, 2)
96 buf.Reset()
97
98 r.Resize(100, 30)
99 r.DrawLog([]string{"hi"}, []string{"▌ "}, 0, 2)
100 if buf.Len() == 0 {
101 t.Fatal("post-resize redraw skipped; the new frame would never reach the terminal")
102 }
103}
104
105// TestDrawLogInaccessibleChangePreservesScrollbackSelection covers long
106// streaming output whose changing first row has already scrolled above the
107// viewport. That row is immutable terminal history: clearing or replaying it
108// either destroys a native mouse selection or duplicates stale tool frames.
109func TestDrawLogInaccessibleChangePreservesScrollbackSelection(t *testing.T) {
110 t.Setenv("TERM_PROGRAM", "")
111 var buf bytes.Buffer
112 r := NewRenderer(&buf)
113 r.Resize(80, 3)
114 r.DrawLog([]string{"selected partial", "line 2", "line 3", "line 4"}, []string{"input"}, 0, 0)
115 buf.Reset()
116
117 // Only the historical row changed. DrawLog must leave the terminal alone
118 // instead of clearing and replaying the retained scrollback.
119 r.DrawLog([]string{"selected partial response", "line 2", "line 3", "line 4"}, []string{"input"}, 0, 0)
120 got := buf.String()
121 if strings.Contains(got, SeqClearScreenNoHome) || strings.Contains(got, SeqClearScrollback) {
122 t.Fatalf("inaccessible change cleared selected scrollback: %q", got)
123 }
124 if strings.Contains(got, "selected partial response") {
125 t.Fatalf("inaccessible row was replayed into retained scrollback: %q", got)
126 }
127}
128
129func TestDrawLogStructuralReflowAboveViewportRebasesWithoutReplay(t *testing.T) {
130 t.Setenv("TERM_PROGRAM", "ghostty")
131 var buf bytes.Buffer
132 r := NewRenderer(&buf)
133 r.Resize(80, 4)
134 oldChat := []string{
135 "user prompt",
136 "┌ bash first ─────", "│ old output", "└──────────────────",
137 "┌ bash second ────", "│ second output", "└──────────────────",
138 }
139 r.DrawLog(oldChat, []string{"input"}, 0, 0)
140 buf.Reset()
141
142 // The first tool gains wrapped rows after its top has scrolled away.
143 // Clearing the viewport and replaying the complete logical transcript
144 // leaves the old prompt in native scrollback and prints a second copy.
145 // Rebase the logical row coordinates instead, leaving inaccessible rows
146 // as historical snapshots and keeping the visible tail aligned.
147 newChat := []string{
148 "user prompt",
149 "┌ bash first ─────", "│ old output", "│ wrapped line 1", "│ wrapped line 2", "└──────────────────",
150 "┌ bash second ────", "│ second output", "└──────────────────",
151 }
152 r.DrawLog(newChat, []string{"input"}, 0, 0)
153 got := buf.String()
154 if strings.Contains(got, SeqClearScreenNoHome) || strings.Contains(got, SeqClearScrollback) {
155 t.Fatalf("structural reflow cleared the terminal: %q", got)
156 }
157 for _, replayed := range []string{"user prompt", "┌ bash first", "┌ bash second"} {
158 if strings.Contains(got, replayed) {
159 t.Fatalf("structural reflow replayed %q into scrollback: %q", replayed, got)
160 }
161 }
162
163 buf.Reset()
164 appended := append(append([]string(nil), newChat...), "┌ bash third ─────", "│ third output", "└──────────────────")
165 r.DrawLog(appended, []string{"input"}, 0, 0)
166 got = buf.String()
167 if !strings.Contains(got, "┌ bash third") || !strings.Contains(got, "│ third output") {
168 t.Fatalf("new output was not appended after coordinate rebase: %q", got)
169 }
170 for _, replayed := range []string{"user prompt", "┌ bash first", "┌ bash second"} {
171 if strings.Contains(got, replayed) {
172 t.Fatalf("append after rebase replayed %q: %q", replayed, got)
173 }
174 }
175}
176
177func TestDrawLogInaccessibleChangeStillAppendsNewOutput(t *testing.T) {
178 t.Setenv("TERM_PROGRAM", "")
179 var buf bytes.Buffer
180 r := NewRenderer(&buf)
181 r.Resize(80, 3)
182 r.DrawLog([]string{"selected partial", "line 2", "line 3", "line 4"}, []string{"input"}, 0, 0)
183 buf.Reset()
184
185 // A streaming reflow changes inaccessible history while a tool result is
186 // appended. Only the new suffix should be emitted, naturally scrolling the
187 // selected old text upward without replaying the complete frame.
188 r.DrawLog([]string{"selected partial response", "line 2", "line 3", "line 4", "tool output"}, []string{"input"}, 0, 0)
189 got := buf.String()
190 if strings.Contains(got, SeqClearScreenNoHome) || strings.Contains(got, SeqClearScrollback) {
191 t.Fatalf("append after inaccessible change cleared selected scrollback: %q", got)
192 }
193 if strings.Contains(got, "selected partial response") || strings.Contains(got, "line 2") {
194 t.Fatalf("append replayed historical rows: %q", got)
195 }
196 if !strings.Contains(got, "tool output") {
197 t.Fatalf("new tool output was not appended: %q", got)
198 }
199}
200
201// TestDrawLogInvalidationPreservesScrollbackSelection pins the same rule for
202// cache invalidations, which can happen during an active turn independently
203// of an inaccessible changed row.
204func TestDrawLogInvalidationPreservesScrollbackSelection(t *testing.T) {
205 t.Setenv("TERM_PROGRAM", "")
206 var buf bytes.Buffer
207 r := NewRenderer(&buf)
208 r.Resize(80, 3)
209 r.DrawLog([]string{"one", "two", "three", "four"}, []string{"input"}, 0, 0)
210 buf.Reset()
211
212 r.Invalidate()
213 r.DrawLog([]string{"one", "two", "three", "four"}, []string{"input"}, 0, 0)
214 if got := buf.String(); strings.Contains(got, SeqClearScrollback) {
215 t.Fatalf("invalidation repaint erased scrollback and native selection: %q", got)
216 }
217}