1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272

package acp_test

import (
	"os"
	"slices"
	"strings"
	"testing"

	"codeberg.org/turbo-editors/turbo-core/acp"
	"codeberg.org/turbo-editors/turbo-core/syntax"
	"codeberg.org/turbo-editors/turbo-core/theme"
)

// TestMain registers a stand-in Go, because an editor is what teaches this
// library the language it is *for* — turbo-go registers the real one, and
// nothing in turbo-core does.
//
// The scanner is deliberately trivial: these tests are about whether a fenced
// block reaches a scanner at all and whether the spans line up with the text
// as drawn, not about Go. A real one would make the assertions depend on
// go/scanner's opinion of a fragment.
func TestMain(m *testing.M) {
	syntax.Register(syntax.Definition{
		Language:   "go",
		Extensions: []string{".go"},
		Highlight:  highlightFirstWord,
	})
	os.Exit(m.Run())
}

// highlightFirstWord colours the first word of each line as a keyword.
func highlightFirstWord(src string) [][]syntax.Span {
	return syntax.ScanLines(src, func(line []rune, _ struct{}) ([]syntax.Span, struct{}) {
		s := syntax.NewLineScanner(line)
		s.SkipSpaces()
		s.TakeWhile(syntax.ClassKeyword, syntax.IsWordRune)
		return s.Spans(), struct{}{}
	})
}

func TestOnlyAFenceMakesABlockCode(t *testing.T) {
	// A scanner is never guessed at from the shape of the text: a highlighter
	// that is wrong is worse than one that is quiet.
	blocks := acp.SplitBlocks("here it is:\n```go\nx := 1\n```\nand that is all")

	if len(blocks) != 3 {
		t.Fatalf("split into %d blocks: %v", len(blocks), blocks)
	}
	if blocks[0].Code || blocks[0].Text != "here it is:" {
		t.Errorf("the first block is %v", blocks[0])
	}
	if !blocks[1].Code || blocks[1].Text != "x := 1" {
		t.Errorf("the code block is %v", blocks[1])
	}
	if blocks[1].Language != syntax.Language("go") {
		t.Errorf("the fence named %q, want go", blocks[1].Language)
	}
	if blocks[2].Code || blocks[2].Text != "and that is all" {
		t.Errorf("the last block is %v", blocks[2])
	}
}

func TestAFenceNobodyClosedIsStillCode(t *testing.T) {
	// An agent cut off mid-answer leaves one, and drawing the rest as prose
	// would change colour halfway down a function for no visible reason.
	blocks := acp.SplitBlocks("look:\n```go\nfunc main() {\n")

	if len(blocks) != 2 {
		t.Fatalf("split into %d blocks: %v", len(blocks), blocks)
	}
	if !blocks[1].Code {
		t.Errorf("the unclosed fence came out as prose: %v", blocks[1])
	}
}

func TestAFenceNamingALanguageNothingColoursIsLeftPlain(t *testing.T) {
	blocks := acp.SplitBlocks("```brainfuck\n+++.\n```")

	if len(blocks) != 1 || !blocks[0].Code {
		t.Fatalf("split into %v", blocks)
	}
	if blocks[0].Language != syntax.LanguageNone {
		t.Errorf("the fence resolved to %q, want none", blocks[0].Language)
	}
}

func TestTheTagsModelsWriteAreUnderstood(t *testing.T) {
	// A model writes ```sh and ```golang by habit, and a block left plain
	// because of a synonym looks exactly like a scanner that does not work.
	for tag, want := range map[string]syntax.Language{
		"sh":     syntax.LanguageBash,
		"shell":  syntax.LanguageBash,
		"yml":    syntax.LanguageYAML,
		"js":     syntax.LanguageJavaScript,
		"md":     syntax.LanguageMarkdown,
		"TOML":   syntax.LanguageTOML,
		"docker": syntax.LanguageDockerfile,
	} {
		blocks := acp.SplitBlocks("```" + tag + "\nx\n```")
		if got := blocks[0].Language; got != want {
			t.Errorf("```%s resolved to %q, want %q", tag, got, want)
		}
	}
}

func TestWrappingKeepsTheAuthorsOwnBreaks(t *testing.T) {
	// A reply laid out in paragraphs should stay in paragraphs.
	got := acp.Wrap("one\n\ntwo", 40)
	want := []string{"one", "", "two"}
	if !slices.Equal(got, want) {
		t.Errorf("Wrap() = %v, want %v", got, want)
	}
}

func TestWrappingBreaksAtSpacesAndThenAnywhere(t *testing.T) {
	if got := acp.Wrap("aaa bbb ccc", 7); !slices.Equal(got, []string{"aaa bbb", "ccc"}) {
		t.Errorf("Wrap() = %v", got)
	}

	// A word longer than the line must still end: a space-only rule would loop
	// for ever on a long path or a base64 blob.
	long := strings.Repeat("x", 25)
	got := acp.Wrap(long, 10)
	if len(got) != 3 {
		t.Fatalf("Wrap() = %v, want three pieces", got)
	}
	if strings.Join(got, "") != long {
		t.Errorf("Wrap() lost or added characters: %v", got)
	}
}

func TestSpeakersAndThoughtsTakeTheirOwnStyles(t *testing.T) {
	entries := []acp.Entry{
		{Kind: acp.EntryUser, Speaker: "You", Text: "hello"},
		{Kind: acp.EntryThought, Text: "hmm"},
		{Kind: acp.EntryNotice, Text: "the agent stopped"},
	}

	lines := acp.Lines(entries, "Bob", 40)
	styles := map[string]string{}
	for _, line := range lines {
		styles[strings.TrimSpace(line.Text)] = line.Style
	}

	if got := styles["‣ You"]; got != theme.KeySyntaxKeyword {
		t.Errorf("a speaker's label is drawn in %q", got)
	}
	if got := styles["hmm"]; got != theme.KeySyntaxComment {
		t.Errorf("a thought is drawn in %q", got)
	}
	if got := styles["the agent stopped"]; got != theme.KeyDiagnosticError {
		t.Errorf("a notice is drawn in %q", got)
	}
	if got := styles["hello"]; got != "" {
		t.Errorf("ordinary prose is drawn in %q, want the window's own text", got)
	}
}

func TestAFailedToolCallIsDrawnAsAProblem(t *testing.T) {
	ok := acp.Lines([]acp.Entry{{Kind: acp.EntryTool, Speaker: "Shell", Status: acp.StatusCompleted}}, "Bob", 60)
	bad := acp.Lines([]acp.Entry{{Kind: acp.EntryTool, Speaker: "Shell", Status: acp.StatusFailed}}, "Bob", 60)

	if ok[0].Style != theme.KeySyntaxType {
		t.Errorf("a completed tool call is drawn in %q", ok[0].Style)
	}
	if bad[0].Style != theme.KeyDiagnosticError {
		t.Errorf("a failed tool call is drawn in %q, want the error colour", bad[0].Style)
	}
	if !strings.Contains(ok[0].Text, "done") || !strings.Contains(bad[0].Text, "failed") {
		t.Errorf("the statuses read %q and %q; a tick and a cross alone are one cell apart", ok[0].Text, bad[0].Text)
	}
}

func TestCodeInAFenceIsColouredSpanBySpan(t *testing.T) {
	entries := []acp.Entry{{Kind: acp.EntryAgent, Speaker: "Bob", Text: "```go\nif true\n```"}}
	lines := acp.Lines(entries, "Bob", 60)

	var code *acp.Line
	for i, line := range lines {
		if strings.Contains(line.Text, "if true") {
			code = &lines[i]
		}
	}
	if code == nil {
		t.Fatalf("the code never appeared: %v", lines)
	}
	if len(code.Spans) == 0 {
		t.Fatalf("the code line carries no spans: %q", code.Text)
	}

	// The spans must line up with the text as drawn, which is indented.
	for _, span := range code.Spans {
		if span.Start < 0 || span.End > len([]rune(code.Text)) {
			t.Errorf("a span runs from %d to %d, outside %q", span.Start, span.End, code.Text)
		}
	}
	first := code.Spans[0]
	if got := string([]rune(code.Text)[first.Start:first.End]); got != "if" {
		t.Errorf("the first span covers %q, want the keyword — the indent was not accounted for", got)
	}
}

func TestProseIsWrappedAndCodeIsNot(t *testing.T) {
	// A wrapped line of code would need its spans remapped onto the pieces,
	// and half a line of Go under the line above reads worse than one that is
	// simply too long. Editors clip code; they do not reflow it.
	long := strings.Repeat("word ", 20)
	prose := acp.Lines([]acp.Entry{{Kind: acp.EntryAgent, Text: long}}, "Bob", 30)
	wrapped := 0
	for _, line := range prose {
		if strings.TrimSpace(line.Text) != "" && !strings.HasPrefix(line.Text, "‣") {
			wrapped++
		}
	}
	if wrapped < 3 {
		t.Errorf("long prose came out as %d lines at width 30", wrapped)
	}

	code := acp.Lines([]acp.Entry{{Kind: acp.EntryAgent, Text: "```go\n" + strings.Repeat("x", 100) + "\n```"}}, "Bob", 30)
	found := false
	for _, line := range code {
		if len([]rune(line.Text)) > 30 {
			found = true
		}
	}
	if !found {
		t.Error("a long line of code was wrapped; it should run off the edge instead")
	}
}

func TestAPlanIsDrawnWithABoxPerStep(t *testing.T) {
	entries := []acp.Entry{{Kind: acp.EntryPlan, Plan: []acp.PlanEntry{
		{Content: "look", Status: acp.StatusCompleted},
		{Content: "report", Status: acp.StatusInProgress},
		{Content: "stop", Status: acp.StatusPending},
	}}}

	lines := acp.Lines(entries, "Bob", 60)
	joined := strings.Join(textsOf(lines), "\n")
	for _, want := range []string{"[x] look", "[~] report", "[ ] stop"} {
		if !strings.Contains(joined, want) {
			t.Errorf("the plan never shows %q:\n%s", want, joined)
		}
	}
}

func TestEntriesAreSeparatedByABlankLine(t *testing.T) {
	entries := []acp.Entry{
		{Kind: acp.EntryUser, Text: "one"},
		{Kind: acp.EntryUser, Text: "two"},
	}

	lines := acp.Lines(entries, "Bob", 40)
	blanks := 0
	for _, line := range lines {
		if line.Text == "" {
			blanks++
		}
	}
	if blanks != 1 {
		t.Errorf("two entries are separated by %d blank lines, want 1", blanks)
	}
}

// textsOf returns the text of each line.
func textsOf(lines []acp.Line) []string {
	out := make([]string, len(lines))
	for i, line := range lines {
		out[i] = line.Text
	}
	return out
}