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main.go
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// Enhanced Markdown template processor.
package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"time"
"github.com/mh-cbon/emd/cli"
"github.com/mh-cbon/emd/deprecated"
"github.com/mh-cbon/emd/emd"
gostd "github.com/mh-cbon/emd/go"
gononstd "github.com/mh-cbon/emd/go-nonstd"
"github.com/mh-cbon/emd/provider"
"github.com/mh-cbon/emd/std"
)
// VERSION defines the running build id.
var VERSION = "0.0.0"
var program = cli.NewProgram("emd", VERSION)
var verbose bool
func logMsg(f string, args ...interface{}) {
if verbose {
log.Printf(f+"\n", args...)
}
}
func main() {
program.Bind()
if err := program.Run(os.Args); err != nil {
log.Println(err)
os.Exit(1)
}
}
// gen sub command
type gencommand struct {
*cli.Command
in string
out string
data string
help bool
shortHelp bool
}
// init sub command
type initcommand struct {
*cli.Command
help bool
shortHelp bool
out string
force bool
}
func init() {
gen := &gencommand{Command: cli.NewCommand("gen", "Process an emd file.", Generate)}
gen.Set.StringVar(&gen.in, "in", "", "Input src file")
gen.Set.StringVar(&gen.out, "out", "-", "Output destination, defaults to stdout")
gen.Set.StringVar(&gen.data, "data", "", "JSON map of data")
gen.Set.BoolVar(&gen.help, "help", false, "Show help")
gen.Set.BoolVar(&gen.shortHelp, "h", false, "Show help")
program.Add(gen)
ini := &initcommand{Command: cli.NewCommand("init", "Init a basic emd file.", InitFile)}
ini.Set.BoolVar(&ini.help, "help", false, "Show help")
ini.Set.BoolVar(&ini.shortHelp, "h", false, "Show help")
ini.Set.BoolVar(&ini.force, "force", false, "Force write")
ini.Set.StringVar(&ini.out, "out", "README.e.md", "Out file")
program.Add(ini)
verbose = os.Getenv("VERBOSE") != ""
}
// Generate is the cli command implementation of gen.
func Generate(s cli.Commander) error {
cmd, ok := s.(*gencommand)
if ok == false {
return fmt.Errorf("Invalid command type %T", s)
}
if cmd.help || cmd.shortHelp {
return program.ShowCmdUsage(cmd)
}
out, err := getStdout(cmd.out)
if err != nil {
return err
}
if x, ok := out.(io.Closer); ok {
defer x.Close()
}
projectPath, err := getProjectPath()
if err != nil {
return err
}
logMsg("projectPath %q", projectPath)
plugins := getPlugins()
data, err := getData(projectPath)
if err != nil {
return err
}
gen := emd.NewGenerator()
gen.SetDataMap(data)
if cmd.in != "" {
if err := gen.AddFileTemplate(cmd.in); err != nil {
return err
}
} else {
b := tryReadOsStdin()
if b != nil && b.Len() > 0 {
gen.AddTemplate(b.String())
} else {
if s, err := os.Stat("README.e.md"); !os.IsNotExist(err) && s.IsDir() == false {
err := gen.AddFileTemplate("README.e.md")
if err != nil {
return err
}
} else {
gen.AddTemplate(defTemplate)
}
}
}
for name, plugin := range plugins {
if err := plugin(gen); err != nil {
return fmt.Errorf("Failed to register %v package: %v", name, err)
}
}
if cmd.data != "" {
jData := map[string]interface{}{}
if err := json.Unmarshal([]byte(cmd.data), &jData); err != nil {
return fmt.Errorf("Cannot decode JSON data string: %v", err)
}
gen.SetDataMap(jData)
}
if err := gen.Execute(out); err != nil {
return fmt.Errorf("Generator failed: %v", err)
}
return nil
}
func tryReadOsStdin() *bytes.Buffer {
copied := make(chan bool)
timedout := make(chan bool)
var ret bytes.Buffer
go func() {
io.Copy(&ret, os.Stdin)
copied <- true
}()
go func() {
<-time.After(time.Millisecond * 10)
timedout <- ret.Len() == 0
}()
select {
case empty := <-timedout:
if empty {
return nil
}
<-copied
case <-copied:
}
return &ret
}
func getProjectPath() (string, error) {
originalCwd, err := os.Getwd()
if err != nil {
return "", err
}
logMsg("cwd %q", originalCwd)
// regular go package
{
projectPath, err := matchProjectPath(originalCwd)
if err == nil {
return projectPath, nil
}
}
// symlinked go package
{
cwd, err := filepath.EvalSymlinks(originalCwd)
if err == nil {
projectPath, err := matchProjectPath(cwd)
if err == nil {
return projectPath, nil
}
}
}
// all other cases
return originalCwd, nil
}
var re = regexp.MustCompile("(src/[^/]+[.](com|org|net)/.+)")
func matchProjectPath(p string) (string, error) {
res := re.FindAllString(p, -1)
if len(res) > 0 {
return res[0][3:], nil
}
return "", fmt.Errorf("Invalid working directory %q", p)
}
func getData(cwd string) (map[string]interface{}, error) {
p := provider.Default(cwd)
return map[string]interface{}{
"Name": p.GetProjectName(),
"User": p.GetUserName(),
"ProviderURL": p.GetProviderURL(),
"ProviderName": p.GetProviderID(),
"URL": p.GetURL(),
"ProjectURL": p.GetProjectURL(),
"Branch": "master",
}, nil
}
func getPlugins() map[string]func(*emd.Generator) error {
return map[string]func(*emd.Generator) error{
"std": std.Register,
"gostd": gostd.Register,
"gononstd": gononstd.Register,
"deprecated": deprecated.Register,
}
}
func getStdout(out string) (io.Writer, error) {
ret := os.Stdout
if out != "-" {
f, err := os.Create(out)
if err != nil {
f, err = os.Open(out)
if err != nil {
return nil, fmt.Errorf("Cannot open out destination: %v", err)
}
}
ret = f
}
return ret, nil
}
// InitFile creates a basic emd file if none exists.
func InitFile(s cli.Commander) error {
cmd, ok := s.(*initcommand)
if ok == false {
return fmt.Errorf("Invalid command type %T", s)
}
if cmd.help || cmd.shortHelp {
return program.ShowCmdUsage(cmd)
}
out := cmd.out
if cmd.out == "" {
out = "README.e.md"
}
if _, err := os.Stat(out); !cmd.force && !os.IsNotExist(err) {
return fmt.Errorf("File exists at %q", out)
}
return ioutil.WriteFile(out, []byte(defTemplate), os.ModePerm)
}
var defTemplate = `# {{.Name}}
{{template "badge/goreport" .}} {{template "badge/godoc" .}}
{{pkgdoc}}
# {{toc 5}}
# Install
{{template "gh/releases" .}}
#### go
{{template "go/install" .}}
`