sneak
77b9d943e4
❌ is a thin black-and-white cross that gets lost against terminal backgrounds and the ANSI red text. 🛑 is a solid red octagon that reads unmistakably as 'stop/error' at a glance, even when the user isn't reading the line carefully.
205 lines
6.8 KiB
Go
205 lines
6.8 KiB
Go
// Package ui provides consistent user-facing output formatting for vaultik.
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// All status updates, banners, errors, and warnings printed to the user
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// should go through a *Writer from this package.
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//
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// Message classes (see Writer methods):
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//
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// - Begin — operation start, left-aligned, marker "》" (white)
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// - Complete— operation completion, left-aligned, marker "》" (green)
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// - Info — left-aligned neutral status, marker "》" (white)
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// - Notice — left-aligned important note, marker "》" (cyan)
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// - Warning — left-aligned warning, full word "Warning: " (orange/yellow)
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// - Error — left-aligned error, full word "ERROR: " (red)
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// - Progress— indented heartbeat / per-item update, marker " 》" (white)
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// - Banner — application banner line, left-aligned, no marker
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//
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// Value formatters (Hex, Size, Duration, Time, Path, Snapshot, Speed,
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// Count, Percent) return ANSI-colored strings the caller composes into
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// the message body. When color is disabled (non-TTY output or NO_COLOR
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// set) all formatters return plain text.
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package ui
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import (
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"fmt"
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"io"
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"os"
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"time"
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"github.com/dustin/go-humanize"
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"golang.org/x/term"
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)
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// ANSI SGR escape sequences.
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const (
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ansiReset = "\033[0m"
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ansiBold = "\033[1m"
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ansiRed = "\033[31m"
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ansiGreen = "\033[32m"
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ansiYellow = "\033[33m" // used for orange "Warning:" and for durations
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ansiBlue = "\033[34m"
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ansiMagenta = "\033[35m"
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ansiCyan = "\033[36m"
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ansiWhite = "\033[37m"
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)
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// Marker is the chevron prefix used for all non-error/warning lines.
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const Marker = "》"
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// Writer formats and emits user-facing messages with optional ANSI color.
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type Writer struct {
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out io.Writer
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color bool
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}
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// New returns a Writer that emits to out. Color is enabled when out is a
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// TTY and the NO_COLOR environment variable is unset.
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// https://no-color.org/
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func New(out io.Writer) *Writer {
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return &Writer{out: out, color: shouldColor(out)}
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}
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// NewWithColor returns a Writer with an explicit color setting, ignoring
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// TTY detection. Useful for tests and for piped output that the caller
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// wants to colorize anyway.
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func NewWithColor(out io.Writer, color bool) *Writer {
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return &Writer{out: out, color: color}
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}
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// Out returns the underlying writer.
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func (w *Writer) Out() io.Writer { return w.out }
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// Color reports whether color is enabled on this writer.
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func (w *Writer) Color() bool { return w.color }
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// shouldColor returns true when w is a real TTY and NO_COLOR is unset.
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func shouldColor(w io.Writer) bool {
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if os.Getenv("NO_COLOR") != "" {
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return false
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}
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f, ok := w.(*os.File)
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if !ok {
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return false
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}
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return term.IsTerminal(int(f.Fd()))
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}
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// paint wraps s in the given ANSI color when color is enabled.
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func (w *Writer) paint(color, s string) string {
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if !w.color {
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return s
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}
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return color + s + ansiReset
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}
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// ───────────────────────── message methods ─────────────────────────
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// Begin prints an operation-start line, left-aligned with a white marker.
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func (w *Writer) Begin(format string, args ...any) {
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w.emit(ansiWhite, Marker, "", format, args)
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}
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// Complete prints an operation-completion line in green, left-aligned.
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func (w *Writer) Complete(format string, args ...any) {
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w.emit(ansiGreen, Marker, ansiGreen, format, args)
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}
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// Info prints a neutral status line, left-aligned with a white marker.
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func (w *Writer) Info(format string, args ...any) {
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w.emit(ansiWhite, Marker, "", format, args)
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}
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// Notice prints an attention-worthy informational line, marker in cyan.
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func (w *Writer) Notice(format string, args ...any) {
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w.emit(ansiCyan, Marker, "", format, args)
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}
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// Warning prints "⚠️ Warning: " in orange/yellow followed by the message.
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func (w *Writer) Warning(format string, args ...any) {
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prefix := "⚠️ " + w.paint(ansiYellow+ansiBold, "Warning: ")
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_, _ = fmt.Fprintln(w.out, prefix+fmt.Sprintf(format, args...))
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}
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// Error prints "🛑 ERROR: " in red followed by the message. Goes to the
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// same writer as everything else; callers that want stderr should
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// construct a separate Writer for it.
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func (w *Writer) Error(format string, args ...any) {
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prefix := "🛑 " + w.paint(ansiRed+ansiBold, "ERROR: ")
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_, _ = fmt.Fprintln(w.out, prefix+fmt.Sprintf(format, args...))
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}
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// Progress prints an indented heartbeat / per-item update, marker in white.
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func (w *Writer) Progress(format string, args ...any) {
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w.emit(ansiWhite, " "+Marker, "", format, args)
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}
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// Banner prints a line with no marker, left-aligned. Used for the
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// application startup banner only.
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func (w *Writer) Banner(format string, args ...any) {
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_, _ = fmt.Fprintln(w.out, fmt.Sprintf(format, args...))
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}
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// emit writes "<prefix> <body>\n" with the prefix painted in prefixColor
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// and the body optionally painted in bodyColor (empty = no body color).
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func (w *Writer) emit(prefixColor, prefix, bodyColor, format string, args []any) {
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body := fmt.Sprintf(format, args...)
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if bodyColor != "" {
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body = w.paint(bodyColor, body)
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}
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_, _ = fmt.Fprintln(w.out, w.paint(prefixColor, prefix)+" "+body)
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}
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// ───────────────────────── value formatters ─────────────────────────
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//
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// These return ANSI-colored strings the caller composes into a message
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// body. When color is disabled they return plain text.
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// Hex colorizes a hex identifier (blob hash, chunk hash, snapshot id).
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// Long hashes are abbreviated to first 12 chars with "...".
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func (w *Writer) Hex(s string) string {
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short := s
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if len(s) > 12 {
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short = s[:12] + "..."
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}
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return w.paint(ansiCyan, short)
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}
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// Snapshot colorizes a snapshot ID (full, no abbreviation).
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func (w *Writer) Snapshot(id string) string {
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return w.paint(ansiCyan+ansiBold, id)
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}
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// Path colorizes a filesystem path.
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func (w *Writer) Path(p string) string {
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return w.paint(ansiBlue, p)
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}
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// Size colorizes a byte count using humanize.Bytes.
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func (w *Writer) Size(bytes int64) string {
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return w.paint(ansiMagenta, humanize.Bytes(uint64(bytes)))
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}
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// Speed colorizes a byte-per-second value as "<size>/sec".
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func (w *Writer) Speed(bytesPerSec float64) string {
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return w.paint(ansiMagenta, humanize.Bytes(uint64(bytesPerSec))+"/sec")
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}
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// Duration colorizes a time.Duration rounded to the nearest second.
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func (w *Writer) Duration(d time.Duration) string {
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return w.paint(ansiYellow, d.Round(time.Second).String())
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}
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// Time colorizes an absolute time (RFC3339, second precision).
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func (w *Writer) Time(t time.Time) string {
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return w.paint(ansiYellow, t.Format(time.RFC3339))
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}
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// Count colorizes an integer count with thousands separators.
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func (w *Writer) Count(n int) string {
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return w.paint(ansiMagenta, humanize.Comma(int64(n)))
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}
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// Percent colorizes a 0..100 percentage.
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func (w *Writer) Percent(p float64) string {
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return w.paint(ansiMagenta, fmt.Sprintf("%.1f%%", p))
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}
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