From aa16f68620dd661e894d95f4cb959397bc36bef9 Mon Sep 17 00:00:00 2001
From: Chris Lane <chris@chris-allen-lane.com>
Date: Fri, 27 Nov 2020 13:40:24 -0500
Subject: [PATCH] feat(display): add methods to `display`

- Add `indent`, `faint`, and `underline` methods to `display`
- Add tests for the above
---
 internal/display/faint.go          |  8 ++++++++
 internal/display/faint_test.go     | 14 ++++++++++++++
 internal/display/indent.go         | 16 ++++++++++++++++
 internal/display/indent_test.go    | 12 ++++++++++++
 internal/display/underline.go      |  8 ++++++++
 internal/display/underline_test.go | 14 ++++++++++++++
 6 files changed, 72 insertions(+)
 create mode 100644 internal/display/faint.go
 create mode 100644 internal/display/faint_test.go
 create mode 100644 internal/display/indent.go
 create mode 100644 internal/display/indent_test.go
 create mode 100644 internal/display/underline.go
 create mode 100644 internal/display/underline_test.go

diff --git a/internal/display/faint.go b/internal/display/faint.go
new file mode 100644
index 0000000..af0c040
--- /dev/null
+++ b/internal/display/faint.go
@@ -0,0 +1,8 @@
+package display
+
+import "fmt"
+
+// Faint returns an faint string
+func Faint(str string) string {
+	return fmt.Sprintf(fmt.Sprintf("\033[2m%s\033[0m", str))
+}
diff --git a/internal/display/faint_test.go b/internal/display/faint_test.go
new file mode 100644
index 0000000..6591bb4
--- /dev/null
+++ b/internal/display/faint_test.go
@@ -0,0 +1,14 @@
+package display
+
+import (
+	"testing"
+)
+
+// TestFaint asserts that Faint applies faint formatting
+func TestFaint(t *testing.T) {
+	want := "\033[2mfoo\033[0m"
+	got := Faint("foo")
+	if want != got {
+		t.Errorf("failed to faint: want: %s, got: %s", want, got)
+	}
+}
diff --git a/internal/display/indent.go b/internal/display/indent.go
new file mode 100644
index 0000000..3b40556
--- /dev/null
+++ b/internal/display/indent.go
@@ -0,0 +1,16 @@
+package display
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Indent prepends each line of a string with a tab
+func Indent(str string) string {
+	out := ""
+	for _, line := range strings.Split(str, "\n") {
+		out += fmt.Sprintf("\t%s\n", line)
+	}
+
+	return strings.TrimSuffix(out, "\n")
+}
diff --git a/internal/display/indent_test.go b/internal/display/indent_test.go
new file mode 100644
index 0000000..be50b2d
--- /dev/null
+++ b/internal/display/indent_test.go
@@ -0,0 +1,12 @@
+package display
+
+import "testing"
+
+// TestIndent asserts that Indent prepends a tab to each line
+func TestIndent(t *testing.T) {
+	got := Indent("foo\nbar\nbaz")
+	want := "\tfoo\n\tbar\n\tbaz"
+	if got != want {
+		t.Errorf("failed to indent: want: %s, got: %s", want, got)
+	}
+}
diff --git a/internal/display/underline.go b/internal/display/underline.go
new file mode 100644
index 0000000..4ac914c
--- /dev/null
+++ b/internal/display/underline.go
@@ -0,0 +1,8 @@
+package display
+
+import "fmt"
+
+// Underline returns an underlined string
+func Underline(str string) string {
+	return fmt.Sprintf(fmt.Sprintf("\033[4m%s\033[0m", str))
+}
diff --git a/internal/display/underline_test.go b/internal/display/underline_test.go
new file mode 100644
index 0000000..e9743ee
--- /dev/null
+++ b/internal/display/underline_test.go
@@ -0,0 +1,14 @@
+package display
+
+import (
+	"testing"
+)
+
+// TestUnderline asserts that Underline applies underline formatting
+func TestUnderline(t *testing.T) {
+	want := "\033[4mfoo\033[0m"
+	got := Underline("foo")
+	if want != got {
+		t.Errorf("failed to underline: want: %s, got: %s", want, got)
+	}
+}