/
lingo.go
177 lines (153 loc) · 4.46 KB
/
lingo.go
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package main
import (
"bytes"
"fmt"
"go/format"
"io/ioutil"
"log"
"sort"
"strings"
"gopkg.in/yaml.v2"
)
type Language struct {
ID uint `yaml:"language_id"`
Name string
TMScope string `yaml:"tm_scope"`
Color string `yaml:"color"`
Extensions []string `yaml:"extensions"`
Filenames []string `yaml:"filenames"`
}
// NOTE: Due to Go's random iteration of maps, generating will always change languages.go
func main() {
log.SetFlags(0)
log.SetPrefix("lingo: ")
content, err := ioutil.ReadFile("../languages.yml")
if err != nil {
panic(err)
}
languages := map[string]Language{}
err = yaml.Unmarshal([]byte(content), &languages)
if err != nil {
panic(err)
}
sortedLanguageNames := make([]string, 0, len(languages))
for name := range languages {
sortedLanguageNames = append(sortedLanguageNames, name)
}
sort.Strings(sortedLanguageNames)
g := Generator{}
g.Printf("// Code generated by \"lingo\"; DO NOT EDIT.\n")
g.Printf("\n")
g.Printf("package lingo\n")
g.Printf("\n")
g.Printf("type Language struct {\n")
g.Printf("\tID uint\n")
g.Printf("\tName string\n")
g.Printf("\tTMScope string\n")
g.Printf("\tColor string\n")
g.Printf("\tExtensions []string\n")
g.Printf("\tFilenames []string\n")
g.Printf("}\n")
g.Printf("\n")
g.Printf("var (\n")
languagesByExtension := map[string][]Language{}
languagesByFileName := map[string][]Language{}
languagesById := map[uint]string{}
g.Printf("\tLanguages = map[string]Language{\n")
for _, name := range sortedLanguageNames {
v := languages[name]
v.Name = name
g.Printf("\t\t\"%s\":", name)
g.printLanguage(&v)
g.Printf(",\n")
for _, e := range v.Extensions {
x := languagesByExtension[e]
x = append(x, v)
languagesByExtension[e] = x
}
for _, e := range v.Filenames {
x := languagesByFileName[e]
x = append(x, v)
languagesByFileName[e] = x
}
languagesById[v.ID] = name
}
g.Printf("}\n")
sortedByExtension := mapSort(languagesByExtension)
// Languages by extension
g.Printf("\tLanguagesByExtension = map[string][]string{\n")
for _, ext := range sortedByExtension {
langs := languagesByExtension[ext]
var names []string
for _, l := range langs {
names = append(names, fmt.Sprintf(`"%s"`, l.Name))
}
g.Printf("\t\t\"%s\": []string{%s},\n", ext, strings.Join(names, ", "))
}
g.Printf("\t}\n")
sortedByFileName := mapSort(languagesByFileName)
// Languages by filename
g.Printf("\tLanguagesByFileName = map[string][]string{\n")
for _, name := range sortedByFileName {
langs := languagesByFileName[name]
var names []string
for _, l := range langs {
names = append(names, fmt.Sprintf(`"%s"`, l.Name))
}
g.Printf("\t\t\"%s\": []string{%s},\n", name, strings.Join(names, ", "))
}
g.Printf("\t}\n")
// Languages by id
sortedById := make([]uint, 0, len(languagesById))
for id := range languagesById {
sortedById = append(sortedById, id)
}
sort.Slice(sortedById, func(i, j int) bool { return sortedById[i] < sortedById[j] })
g.Printf("\tLanguagesById = map[uint]string{\n")
for _, id := range sortedById {
name := fmt.Sprintf(`"%s"`, languagesById[id])
g.Printf("\t\t%d: %s,\n", id, name)
}
g.Printf("\t}\n")
// end of `var` declaration
g.Printf(")\n")
// Format the output.
src := g.format()
err = ioutil.WriteFile("../lingo/languages.go", src, 0644)
if err != nil {
panic(err)
}
}
func mapSort(toSort map[string][]Language) []string {
sorted := make([]string, 0, len(toSort))
for key := range toSort {
sorted = append(sorted, key)
}
sort.Strings(sorted)
return sorted
}
func (g *Generator) printLanguage(language *Language) {
var extensions []string
for _, e := range language.Extensions {
extensions = append(extensions, fmt.Sprintf(`"%s"`, e))
}
exts := strings.Join(extensions, ", ")
g.Printf("Language{ID: %d, Name:\"%s\", TMScope:\"%s\", Color:\"%s\", Extensions: []string{%s} }", language.ID, language.Name, language.TMScope, language.Color, exts)
}
type Generator struct {
buf bytes.Buffer // Accumulated output.
}
func (g *Generator) Printf(format string, args ...interface{}) {
fmt.Fprintf(&g.buf, format, args...)
}
func (g *Generator) format() []byte {
src, err := format.Source(g.buf.Bytes())
if err != nil {
// Should never happen, but can arise when developing this code.
// The user can compile the output to see the error.
log.Printf("warning: internal error: invalid Go generated: %s", err)
log.Printf("warning: compile the package to analyze the error")
return g.buf.Bytes()
}
return src
}