devtools/cmd/css: moved from content/static/css

content/static/css is moved to devtools/cmd/css (pure code in motion).

Change-Id: I7b48bf017edffb1b4c3c571ed44bac7e09e37918
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/253608
Reviewed-by: Jamal Carvalho <jamal@golang.org>

1 files changed, 142 insertions, 0 deletions

diff --git a/devtools/cmd/css/main.go b/devtools/cmd/css/main.go
new file mode 100644
index 00000000..d6246d7c
--- /dev/null
+++ b/devtools/cmd/css/main.go
@@ -0,0 +1,142 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Command main reads from the CSS file at
+// https://github.com/sindresorhus/github-markdown-css/blob/gh-pages/github-markdown.css
+// and removes all styles that do not belong to a .markdown-body <tag>.  The
+// .markdown-body class is then replaced with .Overview-readmeContent, for use
+// in the discovery codebase. The remaining properties are written to content/static/css/stylesheet.css.
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"runtime"
+	"strings"
+)
+
+const (
+	githubStylesheet     = "https://raw.githubusercontent.com/sindresorhus/github-markdown-css/gh-pages/github-markdown.css"
+	githubREADMEClass    = ".markdown-body"
+	discoveryREADMEClass = ".Overview-readmeContent"
+)
+
+var write = flag.Bool("write", false, "append modifications to content/static/css/stylesheet.css")
+
+func main() {
+	flag.Parse()
+
+	resp, err := http.Get(githubStylesheet)
+	if err != nil {
+		log.Fatalf("http.Get(%q): %v", githubStylesheet, err)
+	}
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("http.Get(%q): status = %d", githubStylesheet, resp.StatusCode)
+	}
+
+	defer resp.Body.Close()
+	scanner := bufio.NewScanner(resp.Body)
+	var (
+		atPropertyStart = true
+		curr            string
+		includeProperty bool
+		properties      []string
+	)
+	for scanner.Scan() {
+		text := scanner.Text()
+		if atPropertyStart && shouldIncludeProperty(text) {
+			includeProperty = true
+		}
+		if text == "}" {
+			if includeProperty {
+				properties = append(properties, curr+text+"\n")
+			}
+			curr = ""
+			includeProperty = false
+			atPropertyStart = true
+			continue
+		}
+		if includeProperty {
+			curr += text
+			curr += "\n"
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	// Get the abs path for content/static/css.
+	_, filename, _, ok := runtime.Caller(0)
+	if !ok {
+		log.Fatal("No caller information")
+	}
+	dir := path.Dir(filename)
+
+	f := dir + "/stylesheet.css"
+	file, err := os.OpenFile(f, os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		log.Fatalf("os.OpenFile(f, os.O_WRONLY|os.O_APPEND, 0644): %v", err)
+	}
+	defer func() {
+		if err := file.Close(); err != nil {
+			log.Fatalf("file.Close(): %v", err)
+		}
+	}()
+
+	if !*write {
+		fmt.Println("Dryrun only. Run with `-write` to write to stylesheet.css.")
+	} else {
+		fmt.Printf("Writing these properties to %q: \n", f)
+	}
+
+	contentsToWrite := `
+/* ---------- */
+/*
+/* The CSS classes below are generated using content/static/css/main.go
+/* To update, delete the contents below and and run go run content/static/css/main.go
+/*
+/* ---------- */`
+	contentsToWrite += "\n\n"
+
+	for _, p := range properties {
+		contentsToWrite += strings.ReplaceAll(p, githubREADMEClass, discoveryREADMEClass)
+	}
+
+	contentsToWrite += `
+/* ---------- */
+/*
+/* End output from content/static/css/main.go.
+/*
+/* ---------- */`
+
+	fmt.Println(contentsToWrite)
+
+	if _, err := file.WriteString(contentsToWrite); err != nil {
+		log.Fatalf("file.WriteString(%q): %v", contentsToWrite, err)
+	}
+}
+
+// shouldIncludeProperty reports whether this property should be included in
+// the CSS file.
+func shouldIncludeProperty(property string) bool {
+	parts := strings.Split(property, " ")
+	if len(parts) < 1 {
+		return false
+	}
+	if parts[0] != githubREADMEClass {
+		return false
+	}
+	for _, p := range parts[1:] {
+		if strings.HasPrefix(p, ".") {
+			return false
+		}
+	}
+	return true
+}