archvillainette
f257672427
Reviewed-on: #21 Co-authored-by: vickydotbat <vickydotbat@tutamail.com> Co-committed-by: vickydotbat <vickydotbat@tutamail.com>
78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
// Package menu renders Crucible's interactive launcher: a numbered list of
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// commands for users who don't want to memorize subcommands. It holds no
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// builder logic — it returns the chosen dispatcher argument slice for the
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// caller to run. This is the seed of a future GUI front-end over the same core.
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package menu
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import (
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"bufio"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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// Item is one selectable command.
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type Item struct {
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Label string // e.g. "module build"
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Desc string // e.g. "build the configured module"
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Args []string // dispatcher args, e.g. {"module", "build"}
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Usage string
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Options []string
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}
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// ANSI styling; terminals that don't support it simply ignore the codes.
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const (
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cReset = "\033[0m"
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cBold = "\033[1m"
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cCyan = "\033[36m"
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cDim = "\033[2m"
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)
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// Select prints the numbered menu to out, reads a selection plus optional extra
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// arguments from in, and returns the full dispatcher argument slice. It returns
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// (nil, nil) when the user quits or enters an empty choice.
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func Select(out io.Writer, in io.Reader, items []Item) ([]string, error) {
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if len(items) == 0 {
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return nil, fmt.Errorf("no commands available")
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}
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fmt.Fprintf(out, "%s%sCrucible%s — pick a command:\n\n", cBold, cCyan, cReset)
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labelWidth := 0
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for _, item := range items {
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if len(item.Label) > labelWidth {
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labelWidth = len(item.Label)
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}
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}
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for i, it := range items {
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fmt.Fprintf(out, " %s%2d%s %s%-*s%s %s%s%s\n",
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cCyan, i+1, cReset, cBold, labelWidth, it.Label, cReset, cDim, it.Desc, cReset)
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}
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fmt.Fprintf(out, " %sq%s quit\n\nselection: ", cCyan, cReset)
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r := bufio.NewReader(in)
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line, _ := r.ReadString('\n')
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switch choice := strings.TrimSpace(line); choice {
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case "", "q", "Q":
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return nil, nil
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default:
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n, err := strconv.Atoi(choice)
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if err != nil || n < 1 || n > len(items) {
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return nil, fmt.Errorf("invalid selection %q", choice)
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}
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it := items[n-1]
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if it.Usage != "" {
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fmt.Fprintf(out, "\nusage: %s\n", it.Usage)
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}
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if len(it.Options) > 0 {
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fmt.Fprintln(out, "options:")
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for _, option := range it.Options {
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fmt.Fprintf(out, " %s\n", option)
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}
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}
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fmt.Fprint(out, "\narguments (press Enter to use defaults): ")
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argLine, _ := r.ReadString('\n')
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extra := strings.Fields(strings.TrimSpace(argLine))
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return append(append([]string{}, it.Args...), extra...), nil
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}
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}
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