94 lines
1.8 KiB
Go
94 lines
1.8 KiB
Go
package repl
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import (
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"context"
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"errors"
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"fmt"
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"github.com/lmika/gopkgs/fp/maps"
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"os"
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"sort"
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"strings"
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"text/tabwriter"
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"ucl.lmika.dev/ucl"
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"unicode"
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)
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type Doc struct {
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Brief string
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Detailed string
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}
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func (d Doc) config(cmdName string, r *REPL) {
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r.commandDocs[cmdName] = d
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}
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func (r *REPL) helpBuiltin(ctx context.Context, args ucl.CallArgs) (any, error) {
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switch {
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case args.NArgs() == 0:
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names := maps.Keys(r.commandDocs)
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sort.Strings(names)
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tabWriter := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
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for _, name := range names {
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cdoc := r.commandDocs[name]
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if cdoc.Brief != "" {
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fmt.Fprintf(tabWriter, "%v\t %v\n", name, r.commandDocs[name].Brief)
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} else {
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fmt.Fprintf(tabWriter, "%v\n", name)
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}
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}
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tabWriter.Flush()
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default:
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var cmdName string
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if err := args.Bind(&cmdName); err != nil {
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return nil, err
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}
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docs, ok := r.commandDocs[cmdName]
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if !ok {
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return nil, errors.New("no help docs found for command")
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}
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fmt.Printf("%v\n", cmdName)
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fmt.Printf(" %v\n", docs.Brief)
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if docs.Detailed != "" {
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fmt.Println("")
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fmt.Println("Details:")
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lines := strings.Split(docs.Detailed, "\n")
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trimLeft := 0
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if len(lines) == 0 {
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return nil, nil
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} else if len(strings.TrimSpace(lines[0])) == 0 && len(lines) > 1 {
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// indicates that the next line should indicate the indentation
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trimLeft = len(lines[1]) - len(strings.TrimLeftFunc(lines[1], unicode.IsSpace))
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lines = lines[1:]
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}
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for _, line := range lines {
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fmt.Printf(" %v\n", trimSpaceLeftUpto(line, trimLeft))
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}
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}
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}
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return NoResults{}, nil
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}
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func trimSpaceLeftUpto(s string, n int) string {
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if n == 0 {
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return s
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}
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for i, c := range s {
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if i >= n {
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return s[i:]
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} else if !unicode.IsSpace(c) {
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return s[i:]
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}
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}
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return s
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}
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