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package textutils
import (
"bytes"
"regexp"
"testing"
)
var beginningR = regexp.MustCompile(`(?m)^`)
func _oldPrefixLines(content string, repl string) string {
return beginningR.ReplaceAllString(content, repl)
}
func TestPrefixLines(t *testing.T) {
runs := []struct {
desc string
input []byte
expected []byte
}{
{
desc: "one line",
input: []byte("abc"),
expected: []byte("> abc"),
},
{
desc: "two lines",
input: []byte("line 1\nline 2"),
expected: []byte("> line 1\n> line 2"),
},
{
desc: "two newlines between",
input: []byte("line 1\n\nline 2"),
expected: []byte("> line 1\n> \n> line 2"),
},
{
desc: "newline at end",
input: []byte("abc\n"),
expected: []byte("> abc\n> "),
},
}
for _, run := range runs {
t.Run(run.desc, func(t *testing.T) {
t.Run("old", func(t *testing.T) {
output := _oldPrefixLines(string(run.input), "> ")
if output != string(run.expected) {
t.Errorf("expected %q but got %q", string(run.expected), output)
}
})
t.Run("new", func(t *testing.T) {
output := PrefixLines(run.input, []byte{'>', ' '})
if !bytes.Equal(output, run.expected) {
t.Errorf("expected %q but got %q", string(run.expected), string(output))
}
})
})
}
}
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