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cat : --strip-file-links

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This commit is contained in:
bth 2026-07-15 13:40:41 -07:00
commit dcbfa03251
1 changed files with 32 additions and 6 deletions
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38
cat/cat.go
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@ -6,6 +6,7 @@ import (
"log"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/brtholomy/um/go/cmd"
@ -17,16 +18,23 @@ const (
CMD = cmd.Cat
SUMMARY = "cat um files together using a filelist. removes header by default"
HR_BLOCK = "\n---\n\n"
HR_BLOCK_STRIP = "---\n\n"
DOUBLE_NEWLINE = "\n\n"
H1 = "# "
)
// NOTE: would prefer to reuse next.FILE_REGEXP, but I don't want a capture group and this is clearer:
const FILE_LINK_REGEXP = `(?m)` + HR_BLOCK_STRIP + `[0-9]+\.[^\.]*\.*md` + DOUBLE_NEWLINE
var fileLinkRegexp *regexp.Regexp = regexp.MustCompile(FILE_LINK_REGEXP)
type options struct {
Filelist flags.Arg
Base flags.String
KeepHeader flags.Bool
KeepTitle flags.Bool
Help flags.Bool
Filelist flags.Arg
Base flags.String
KeepHeader flags.Bool
KeepTitle flags.Bool
StripFileLinks flags.Bool
Help flags.Bool
}
func initOpts() options {
@ -35,6 +43,7 @@ func initOpts() options {
flags.String{"--base", "-b", "", "base directory prepended to files in filelist"},
flags.Bool{"--keep-header", "-d", false, "preserve um headers in concatenated file. overrides --keep-title"},
flags.Bool{"--keep-title", "-t", false, "preserve um titles in concatenated file"},
flags.Bool{"--strip-file-links", "-s", false, "strip file links in concatenated file"},
flags.Bool{"--help", "-h", false, "show help"},
}
}
@ -67,6 +76,19 @@ func decapitate(s string, opts options) string {
return s
}
// strips out file links, which are simply a single filename between hr section blocks:
// ---
//
// 100.foo.md
//
// NOTE: only matches the signature of a single filename.
func stripFileLinks(s string, opts options) string {
if !opts.StripFileLinks.IsSet() {
return s
}
return fileLinkRegexp.ReplaceAllString(s, "")
}
func cat(files []string, opts options) (string, error) {
ff := make([]string, 0, len(files))
for _, f := range files {
@ -79,7 +101,11 @@ func cat(files []string, opts options) (string, error) {
ff = append(ff, s)
}
// NOTE: prepend leading HR_BLOCK, since these are used for section numbering in both online and print format:
return HR_BLOCK + strings.Join(ff, HR_BLOCK), nil
catted := HR_BLOCK + strings.Join(ff, HR_BLOCK)
// NOTE: strip here, because only the fully catted string will match the file link signature,
// since such links can occur at the beginning of a file with no leading hr.
catted = stripFileLinks(catted, opts)
return catted, nil
}
func Cat(args []string) {