abstract terminal interface

app/common/console.go

@@ -0,0 +1,50 @@
+package common
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Terminal interface {
+	Start() error
+	Header(string) error
+	Subheader(string) error
+	Print(string) error
+	End() error
+}
+
+type StringBuilderTerminal struct {
+	sb *strings.Builder
+}
+
+func NewTerminal() Terminal {
+	return &StringBuilderTerminal{
+		sb: &strings.Builder{},
+	}
+}
+
+func (t *StringBuilderTerminal) Start() error {
+	_, err := fmt.Fprint(t.sb, "\033[H")
+	return err
+}
+
+func (t *StringBuilderTerminal) Header(header string) error {
+	_, err := fmt.Fprintf(t.sb, "=== %s ===\033[K\n", header)
+	return err
+}
+
+func (t *StringBuilderTerminal) Subheader(subheader string) error {
+	_, err := fmt.Fprintf(t.sb, "--- %s ---\033[K\n", subheader)
+	return err
+}
+
+func (t *StringBuilderTerminal) Print(line string) error {
+	_, err := fmt.Fprintf(t.sb, "%s\033[K\n", line)
+	return err
+}
+
+func (t *StringBuilderTerminal) End() error {
+	fmt.Fprint(t.sb, "\033[0J")
+	_, err := fmt.Print(t.sb.String())
+	return err
+}