dev_agent
942ac42b86
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Co-authored-by: dev_agent <dev_agent@cubecraftlabs.com>
103 lines
3.1 KiB
Go
103 lines
3.1 KiB
Go
// Package prompts holds the skills' prompt templates, embedded from this
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// directory. Each skill version has one text/template file named
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// <skill>.v<version>.tmpl that defines two templates: "instructions", the
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// skill's layer of the system prompt, and "user", the user message. Both
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// execute with the data the skill derives from its input.
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//
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// A template never changes under a released version: checksums.txt records
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// the SHA-256 of every template, and a test fails when a template no longer
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// matches it. Changing a prompt means bumping the skill's version, which
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// renames its template file.
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package prompts
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import (
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"bytes"
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"embed"
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"fmt"
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"io/fs"
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"regexp"
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"strconv"
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"strings"
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"text/template"
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)
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//go:embed *.tmpl
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var files embed.FS
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// fileName matches a template file name and captures the skill name and
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// version.
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var fileName = regexp.MustCompile(`^([a-z][a-z0-9_]*)\.v([1-9][0-9]*)\.tmpl$`)
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// templates maps a template file name to its parsed template. A bad
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// template stops the service at start.
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var templates = mustParse(files)
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func mustParse(fsys fs.FS) map[string]*template.Template {
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t, err := parse(fsys)
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if err != nil {
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panic(err)
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}
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return t
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}
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// parse parses every template in fsys, each on its own so that every skill
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// can define "instructions" and "user".
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func parse(fsys fs.FS) (map[string]*template.Template, error) {
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names, err := fs.Glob(fsys, "*.tmpl")
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if err != nil {
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return nil, err
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}
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out := make(map[string]*template.Template, len(names))
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for _, name := range names {
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if !fileName.MatchString(name) {
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return nil, fmt.Errorf("prompts: %s: file name is not <skill>.v<version>.tmpl", name)
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}
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t, err := template.New(name).Option("missingkey=error").ParseFS(fsys, name)
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if err != nil {
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return nil, fmt.Errorf("prompts: %w", err)
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}
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for _, part := range []string{"instructions", "user"} {
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if t.Lookup(part) == nil {
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return nil, fmt.Errorf("prompts: %s: does not define %q", name, part)
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}
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}
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out[name] = t
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}
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return out, nil
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}
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// File is the name of the template file for version of skill.
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func File(skill string, version int) string {
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return skill + ".v" + strconv.Itoa(version) + ".tmpl"
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}
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// Render executes the template for version of skill with data and returns
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// its instructions and user message, trimmed of surrounding white space.
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// Either being empty is an error.
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func Render(skill string, version int, data any) (instructions, user string, err error) {
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name := File(skill, version)
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t, ok := templates[name]
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if !ok {
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return "", "", fmt.Errorf("prompts: no template %s for skill %s v%d", name, skill, version)
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}
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if instructions, err = execute(t, "instructions", data); err != nil {
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return "", "", err
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}
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if user, err = execute(t, "user", data); err != nil {
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return "", "", err
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}
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return instructions, user, nil
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}
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func execute(t *template.Template, part string, data any) (string, error) {
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var b bytes.Buffer
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if err := t.ExecuteTemplate(&b, part, data); err != nil {
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return "", fmt.Errorf("prompts: %w", err)
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}
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s := strings.TrimSpace(b.String())
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if s == "" {
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return "", fmt.Errorf("prompts: %s: %q rendered empty", t.Name(), part)
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}
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return s, nil
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}
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