posts-go/main.go

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package main
import (
"context"
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"fmt"
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"log"
"os"
"path/filepath"
"strings"
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"text/template"
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"github.com/google/go-github/v48/github"
"golang.org/x/oauth2"
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"golang.org/x/sync/errgroup"
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)
const (
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postFilesPath = "posts"
templatePostPath = "templates/post.html"
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generatedPath = "docs"
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extHTML = ".html"
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)
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type templatePostData struct {
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Index string
Body string
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}
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func main() {
ctx := context.Background()
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// Cleanup generated path
if err := os.RemoveAll(generatedPath); err != nil {
log.Fatalln("Failed to remove all", generatedPath, err)
}
if err := os.MkdirAll(generatedPath, 0o777); err != nil {
log.Fatalln("Failed to mkdir all", generatedPath)
}
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// Read post files directory
postFiles, err := os.ReadDir(postFilesPath)
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if err != nil {
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log.Fatalln("Failed to read dir", postFilesPath)
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}
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// Prepare template
templatePostBytes, err := os.ReadFile(templatePostPath)
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if err != nil {
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log.Fatalln("Failed to read file", templatePostPath, err)
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}
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templatePost, err := template.New("post").Parse(string(templatePostBytes))
if err != nil {
log.Fatalln("Failed to parse template", err)
}
// Prepare GitHub
ghAccessTokenBytes, err := os.ReadFile(".github_access_token")
if err != nil {
log.Fatalln("Failed to read file", ".github_access_token", err)
}
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ghTokenSrc := oauth2.StaticTokenSource(
&oauth2.Token{
AccessToken: string(ghAccessTokenBytes),
},
)
ghHTTPClient := oauth2.NewClient(ctx, ghTokenSrc)
ghClient := github.NewClient(ghHTTPClient)
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eg := new(errgroup.Group)
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// Generate post files
for _, postFile := range postFiles {
if postFile.IsDir() {
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continue
}
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postFilename := postFile.Name()
eg.Go(func() error {
// Prepare post file
mdFilename := filepath.Join(postFilesPath, postFilename)
mdFileBytes, err := os.ReadFile(mdFilename)
if err != nil {
return fmt.Errorf("os: failed to read file %s: %w", mdFilename, err)
}
ghMarkdown, _, err := ghClient.Markdown(ctx, string(mdFileBytes), &github.MarkdownOptions{
Mode: "markdown",
})
if err != nil {
return fmt.Errorf("github: failed to markdown: %w", err)
}
// Prepare html file
htmlFilename := strings.TrimSuffix(postFilename, filepath.Ext(postFilename)) + extHTML
htmlFilepath := filepath.Join(generatedPath, htmlFilename)
htmlFile, err := os.OpenFile(htmlFilepath, os.O_RDWR|os.O_CREATE, 0o600)
if err != nil {
return fmt.Errorf("os: failed to open file %s: %w", htmlFilepath, err)
}
defer htmlFile.Close()
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// Ignore index in index file
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indexHTML := `<div><a href="index.html">Index</a></div>`
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if strings.Contains(postFilename, "index") {
indexHTML = ""
}
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if err := templatePost.Execute(htmlFile, templatePostData{
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Index: indexHTML,
Body: ghMarkdown,
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}); err != nil {
return fmt.Errorf("template: failed to execute: %w", err)
}
return nil
})
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}
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// Wait for all HTTP fetches to complete.
if err := eg.Wait(); err != nil {
log.Fatalln("I am sorry :(", err)
} else {
log.Println("Build successfully. Are you happy now?")
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}
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}