159 lines
2.9 KiB
Go
159 lines
2.9 KiB
Go
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package template
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import (
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"bytes"
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"embed"
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"encoding/json"
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"errors"
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"io"
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"math"
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"slices"
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"strings"
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"sync"
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"text/template"
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"text/template/parse"
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"github.com/agnivade/levenshtein"
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"golang.org/x/exp/maps"
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)
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//go:embed index.json
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var indexBytes []byte
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//go:embed *.gotmpl
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var templatesFS embed.FS
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var templatesOnce = sync.OnceValues(func() ([]*named, error) {
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var templates []*named
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if err := json.Unmarshal(indexBytes, &templates); err != nil {
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return nil, err
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}
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for _, t := range templates {
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bts, err := templatesFS.ReadFile(t.Name + ".gotmpl")
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if err != nil {
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return nil, err
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}
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// normalize line endings
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t.Bytes = bytes.ReplaceAll(bts, []byte("\r\n"), []byte("\n"))
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}
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return templates, nil
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})
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type named struct {
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Name string `json:"name"`
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Template string `json:"template"`
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Bytes []byte
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}
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func (t named) Reader() io.Reader {
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return bytes.NewReader(t.Bytes)
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}
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func Named(s string) (*named, error) {
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templates, err := templatesOnce()
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if err != nil {
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return nil, err
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}
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var template *named
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score := math.MaxInt
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for _, t := range templates {
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if s := levenshtein.ComputeDistance(s, t.Template); s < score {
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score = s
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template = t
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}
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}
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if score < 100 {
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return template, nil
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}
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return nil, errors.New("no matching template found")
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}
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type Template struct {
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*template.Template
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raw string
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}
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func (t *Template) String() string {
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return t.raw
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}
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var DefaultTemplate, _ = Parse("{{ .Prompt }}")
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func Parse(s string) (*Template, error) {
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t, err := template.New("").Option("missingkey=zero").Parse(s)
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if err != nil {
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return nil, err
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}
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return &Template{Template: t, raw: s}, nil
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}
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func (t *Template) Vars() []string {
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var vars []string
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for _, n := range t.Tree.Root.Nodes {
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vars = append(vars, parseNode(n)...)
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}
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set := make(map[string]struct{})
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for _, n := range vars {
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set[strings.ToLower(n)] = struct{}{}
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}
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vars = maps.Keys(set)
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slices.Sort(vars)
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return vars
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}
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func parseNode(n parse.Node) []string {
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switch n := n.(type) {
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case *parse.ActionNode:
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return parseNode(n.Pipe)
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case *parse.IfNode:
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names := parseNode(n.Pipe)
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names = append(names, parseNode(n.List)...)
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if n.ElseList != nil {
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names = append(names, parseNode(n.ElseList)...)
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}
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return names
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case *parse.RangeNode:
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names := parseNode(n.Pipe)
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names = append(names, parseNode(n.List)...)
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if n.ElseList != nil {
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names = append(names, parseNode(n.ElseList)...)
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}
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return names
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case *parse.WithNode:
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names := parseNode(n.Pipe)
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names = append(names, parseNode(n.List)...)
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if n.ElseList != nil {
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names = append(names, parseNode(n.ElseList)...)
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}
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return names
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case *parse.PipeNode:
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var names []string
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for _, c := range n.Cmds {
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for _, a := range c.Args {
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names = append(names, parseNode(a)...)
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}
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}
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return names
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case *parse.ListNode:
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var names []string
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for _, n := range n.Nodes {
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names = append(names, parseNode(n)...)
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}
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return names
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case *parse.FieldNode:
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return n.Ident
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}
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return nil
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}
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