krino: coloured output, and --no-color

One palette type styles the plan table, warnings, headers, outcome counts,
prompt keys, undo's refused steps and krino log's (undone), from the
16-colour ANSI palette plus bold and faint only. Widths are measured on the
plain text, so columns line up; with colour off the output is unchanged.
--no-color works before or after any subcommand, as NO_COLOR does. The two
search-and-replace colourings are gone.

1 files changed, 12 insertions, 1 deletions

diff --git a/cmd/krino/log.go b/cmd/krino/log.go
index 6eb15d6..bcbe1d0 100644
--- a/cmd/krino/log.go
+++ b/cmd/krino/log.go
@@ -86,12 +86,23 @@ func cmdLog(g *globals, args []string, stdout, stderr io.Writer) int {
 		return 0
 	}
 
+	p := palette{on: colourOn(g, stdout)}
 	for _, r := range runs {
-		fmt.Fprintln(stdout, formatRun(r))
+		fmt.Fprintln(stdout, styleUndone(formatRun(r), p))
 	}
 	return 0
 }
 
+// styleUndone styles the "(undone)" formatRun appends, faint (spec §8.2);
+// a line without it is returned as is.
+func styleUndone(line string, p palette) string {
+	const mark = "  (undone)"
+	if !p.on || !strings.HasSuffix(line, mark) {
+		return line
+	}
+	return strings.TrimSuffix(line, mark) + "  " + p.faint("(undone)")
+}
+
 // formatRun renders one journal.Run as krino log lists it: id, start time,
 // the directories it touched, and its counts (see countsText), with
 // "(undone)" appended when a later run has reversed it.