122 lines
3.1 KiB
Go
122 lines
3.1 KiB
Go
package next
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import (
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"errors"
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"fmt"
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"log"
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"os/exec"
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"strconv"
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cmdpkg "github.com/brtholomy/um/go/cmd"
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"github.com/brtholomy/um/go/flags"
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)
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const cmd = cmdpkg.Next
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type options struct {
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Descriptor flags.Arg
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Tags flags.Arg
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Help flags.Flag[bool]
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}
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func initOpts() options {
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return options{
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flags.Arg{"", "midfix file descriptor"},
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flags.Arg{"", "tags to add to new file"},
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flags.Flag[bool]{"--help", "-h", false, "show help"},
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}
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}
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func parseArgs(args []string) options {
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opts := initOpts()
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for i, arg := range args {
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switch {
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case i == 0 && !flags.HasDashPrefix(arg):
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opts.Descriptor.Val = arg
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case i == 1 && !flags.HasDashPrefix(arg):
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opts.Tags.Val = arg
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case arg == opts.Help.Long || arg == opts.Help.Short:
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flags.Help(cmd, opts)
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default:
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flags.HelpInvalidArg(cmd, arg)
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flags.Help(cmd, opts)
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}
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}
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return opts
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}
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// takes the complete last file string
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// returns the number as string
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func numFromLast(last string) (string, error) {
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res := fileRegexp.FindStringSubmatch(last)
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num := ""
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if len(res) < 2 {
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return num, errors.New(NOT_FOUND_MSG)
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}
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num = res[1]
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return num, nil
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}
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// takes the complete last file string and new descriptor
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// returns the complete next file string
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func next(last string, desc string) (string, error) {
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num, err := numFromLast(last)
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if err != nil {
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return "", err
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}
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i, err := strconv.Atoi(num)
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if err != nil {
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return "", err
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}
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if desc != "" {
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desc = desc + "."
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}
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width := len(num)
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// whaddya doin bro wahh
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fmtstr := fmt.Sprintf("%%0%dd.%%smd", width)
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n := fmt.Sprintf(fmtstr, i+1, desc)
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return n, nil
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}
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// calls (um-next) inside a running emacs server. which has the advantage of fetching the loaded
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// value of um-date-format, and respecting any other loaded configuration we might add.
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//
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// other options would be to forego respecting Elisp config values, or loading from a common config
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// file and forcing emacs to load from there - which would be very un-Emacs. But as the file loading
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// assumes a running server anyway, might as well get the current values.
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//
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// this is the point at which this design becomes weird. But I don't want to let Elisp suck this CLI
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// into its nasty grip. Go is far superior in this application and there's no way I'm writing the
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// `um tag` logic in Elisp.
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//
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// So I've got Go and and an ancient beloved Lisp machine trying to live together.
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func emacsNext(f string, tags string) error {
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quotedargs := fmt.Sprintf(`"%s"`, f)
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if tags != "" {
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quotedargs = fmt.Sprintf(`%s "%s"`, quotedargs, tags)
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}
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fn := fmt.Sprintf(`(um-next %s)`, quotedargs)
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out, err := exec.Command("emacsclient", "--eval", fn).CombinedOutput()
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if err != nil {
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return err
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}
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// NOTE: sends to stderr : is this what we want?
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// if we decide to pipe the filename out, yes.
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log.Print(string(out))
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return nil
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}
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func Next(args []string) {
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opts := parseArgs(args)
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l, err := last()
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if err != nil {
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log.Fatalf("um %s: %v", cmd, err)
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}
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filename, err := next(l, opts.Descriptor.Val)
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if err != nil {
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log.Fatalf("um %s: %v", cmd, err)
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}
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if err := emacsNext(filename, opts.Tags.Val); err != nil {
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log.Fatalf("um %s: %v", cmd, err)
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}
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}
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