first commit

pigo/internal/cli/tui/selection_test.go

@@ -0,0 +1,59 @@
+package tui
+
+import (
+	"testing"
+
+	"charm.land/lipgloss/v2"
+)
+
+// TestRowRange checks the per-row column span for single- and multi-row
+// selections, and that rows outside the range report ok=false.
+func TestRowRange(t *testing.T) {
+	start, end := point{3, 1}, point{7, 3}
+
+	if _, _, ok := rowRange(start, end, 0); ok {
+		t.Error("row above the selection should not be selected")
+	}
+	if c0, c1, ok := rowRange(start, end, 1); !ok || c0 != 3 || c1 != maxCol {
+		t.Errorf("first row = (%d,%d,%v), want (3,maxCol,true)", c0, c1, ok)
+	}
+	if c0, c1, ok := rowRange(start, end, 2); !ok || c0 != 0 || c1 != maxCol {
+		t.Errorf("interior row = (%d,%d,%v), want (0,maxCol,true)", c0, c1, ok)
+	}
+	if c0, c1, ok := rowRange(start, end, 3); !ok || c0 != 0 || c1 != 7 {
+		t.Errorf("last row = (%d,%d,%v), want (0,7,true)", c0, c1, ok)
+	}
+	if _, _, ok := rowRange(start, end, 4); ok {
+		t.Error("row below the selection should not be selected")
+	}
+
+	// A single-row selection uses [start.x, end.x).
+	if c0, c1, ok := rowRange(point{2, 5}, point{9, 5}, 5); !ok || c0 != 2 || c1 != 9 {
+		t.Errorf("single row = (%d,%d,%v), want (2,9,true)", c0, c1, ok)
+	}
+}
+
+// TestSelectRowExtracts verifies the selected text is the column-clipped slice
+// of the row, measured in display cells so CJK is never split, and that ANSI in
+// the source row is stripped before slicing.
+func TestSelectRowExtracts(t *testing.T) {
+	hi := lipgloss.NewStyle().Reverse(true)
+
+	if _, text := selectRow("hello world", 0, 5, hi); text != "hello" {
+		t.Errorf("selected %q, want %q", text, "hello")
+	}
+	if _, text := selectRow("hello world", 6, maxCol, hi); text != "world" {
+		t.Errorf("selected %q, want %q", text, "world")
+	}
+
+	// ANSI coloring in the source is stripped before the selection is measured.
+	styled := lipgloss.NewStyle().Foreground(lipgloss.Color("42")).Render("hello")
+	if _, text := selectRow(styled, 0, maxCol, hi); text != "hello" {
+		t.Errorf("selected %q from styled row, want %q", text, "hello")
+	}
+
+	// CJK counts as two columns: selecting the first two cells yields one rune.
+	if _, text := selectRow("你好ab", 0, 2, hi); text != "你" {
+		t.Errorf("selected %q, want %q (double-width clipped on a cell boundary)", text, "你")
+	}
+}