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languages.go
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languages.go
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package main
import (
"bytes"
"context"
"encoding/json"
"html/template"
"io"
"os"
"os/exec"
"sort"
"strings"
"time"
"github.com/golang/glog"
)
type Language struct {
Name string `json:"name,omitempty"`
ID string `json:"id,omitempty" yaml:"id"`
Formatter string `json:"-"`
AlternateIDs []string `json:"alt_ids,omitempty" yaml:"alt_ids"`
Extensions []string `json:"-"`
MIMETypes []string `json:"-" yaml:"mimetypes"`
DisplayStyle string `json:"-" yaml:"display_style"`
SuppressLineNumbers bool `json:"-" yaml:"suppress_line_numbers"`
}
type LanguageList []*Language
func (l LanguageList) Len() int {
return len(l)
}
func (l LanguageList) Less(i, j int) bool {
return l[i].Name < l[j].Name
}
func (l LanguageList) Swap(i, j int) {
l[i], l[j] = l[j], l[i]
}
func LanguageNamed(name string) *Language {
v, ok := languageConfig.languageMap[name]
if !ok {
return unknownLanguage
}
return v
}
type _LanguageConfiguration struct {
LanguageGroups []*struct {
Name string `json:"name,omitempty"`
Languages LanguageList `json:"languages,omitempty"`
} `yaml:"languageGroups"`
Formatters map[string]*Formatter
languageMap map[string]*Language
modtime time.Time
languageJSONReader *bytes.Reader
}
var languageConfig _LanguageConfiguration
var unknownLanguage *Language = &Language{
Name: "Unknown",
ID: "unknown",
Formatter: "text",
}
type FormatFunc func(context.Context, *Formatter, io.Reader, ...string) (string, error)
type Formatter struct {
Name string
Func string
Env []string
Args []string
fn FormatFunc
}
func (f *Formatter) Format(ctx context.Context, stream io.Reader, lang string) (string, error) {
myargs := make([]string, len(f.Args))
for i, v := range f.Args {
n := v
if n == "%LANG%" {
n = lang
}
myargs[i] = n
}
return f.fn(ctx, f, stream, myargs...)
}
func commandFormatter(ctx context.Context, formatter *Formatter, stream io.Reader, args ...string) (output string, err error) {
var outbuf, errbuf bytes.Buffer
command := exec.CommandContext(ctx, args[0], args[1:]...)
command.Stdin = stream
command.Stdout = &outbuf
command.Stderr = &errbuf
command.Env = formatter.Env
err = command.Run()
output = strings.TrimSpace(outbuf.String())
if err != nil {
output = strings.TrimSpace(errbuf.String())
}
return
}
func plainTextFormatter(ctx context.Context, formatter *Formatter, stream io.Reader, args ...string) (string, error) {
buf := &bytes.Buffer{}
io.Copy(buf, stream)
return template.HTMLEscapeString(buf.String()), nil
}
var formatFunctions map[string]FormatFunc = map[string]FormatFunc{
"commandFormatter": commandFormatter,
"plainText": plainTextFormatter,
"markdown": markdownFormatter,
}
func FormatStream(r io.Reader, language *Language) (string, error) {
var formatter *Formatter
var ok bool
if formatter, ok = languageConfig.Formatters[language.Formatter]; !ok {
formatter = languageConfig.Formatters["default"]
}
timeoutContext, cancel := context.WithTimeout(context.Background(), 2*time.Second)
defer cancel()
return formatter.Format(timeoutContext, r, language.ID)
}
func FormatPaste(p *Paste) (string, error) {
reader, _ := p.Reader()
defer reader.Close()
return FormatStream(reader, p.Language)
}
func loadLanguageConfig() {
languageConfig = _LanguageConfiguration{}
err := YAMLUnmarshalFile("languages.yml", &languageConfig)
if err != nil {
panic(err)
}
languageConfig.languageMap = make(map[string]*Language)
for _, g := range languageConfig.LanguageGroups {
for _, v := range g.Languages {
languageConfig.languageMap[v.ID] = v
for _, langname := range v.AlternateIDs {
languageConfig.languageMap[langname] = v
}
}
sort.Sort(g.Languages)
}
for _, v := range languageConfig.Formatters {
v.fn = formatFunctions[v.Func]
}
glog.Info("Loaded ", len(languageConfig.languageMap), " languages.")
glog.Info("Loaded ", len(languageConfig.Formatters), " formatters.")
fi, _ := os.Stat("languages.yml")
languageConfig.modtime = fi.ModTime()
languageJSON, _ := json.Marshal(languageConfig.LanguageGroups)
languageConfig.languageJSONReader = bytes.NewReader(languageJSON)
}
func init() {
RegisterTemplateFunction("langByLexer", LanguageNamed)
RegisterReloadFunction(loadLanguageConfig)
}