package workspacesdk

import (

"regexp"

"strings"

"golang.org/x/xerrors"

)

// markdownCommentRe strips HTML comments from skill file bodies so

// they don't leak into the LLM prompt.

var markdownCommentRe = regexp.MustCompile(`<!--[\s\S]*?-->`)

// ParseSkillFrontmatter extracts name, description, and the

// remaining body from a skill meta file. The expected format is

// YAML-ish frontmatter delimited by "---" lines:

//

// ---

// name: my-skill

// description: Does a thing

// ---

// Body text here...

func ParseSkillFrontmatter(content string) (name, description, body string, err error) {

content = strings.TrimPrefix(content, "\xef\xbb\xbf")

lines := strings.Split(content, "\n")

if len(lines) == 0 || strings.TrimSpace(lines[0]) != "---" {

return "", "", "", xerrors.New(

"missing opening frontmatter delimiter",

)

}

closingIdx := -1

for i := 1; i < len(lines); i++ {

if strings.TrimSpace(lines[i]) == "---" {

closingIdx = i

break

}

}

if closingIdx < 0 {

return "", "", "", xerrors.New(

"missing closing frontmatter delimiter",

)

}

for _, line := range lines[1:closingIdx] {

key, value, ok := strings.Cut(line, ":")

if !ok {

continue

}

key = strings.TrimSpace(key)

value = strings.TrimSpace(value)

// Strip surrounding quotes from YAML string values.

if len(value) >= 2 {

if (value[0] == '"' && value[len(value)-1] == '"') ||

(value[0] == '\'' && value[len(value)-1] == '\'') {

value = value[1 : len(value)-1]

}

}

switch strings.ToLower(key) {

case "name":

name = value

case "description":

description = value

}

}

if name == "" {

return "", "", "", xerrors.New(

"frontmatter missing required 'name' field",

)

}

// Everything after the closing delimiter is the body.

body = strings.Join(lines[closingIdx+1:], "\n")

body = markdownCommentRe.ReplaceAllString(body, "")

body = strings.TrimSpace(body)

return name, description, body, nil

}