refactor(build): separate link scanning logic

Generation of both internal link graph and external link rank used to be done in one single script. Now it's separated for maintenance.

1 files changed, 0 insertions, 300 deletions

diff --git a/scripts/extract_links.go b/scripts/extract_links.go
deleted file mode 100644
index 657cb738..00000000
--- a/scripts/extract_links.go
+++ /dev/null
@@ -1,300 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"encoding/json"
-	"fmt"
-	"io/fs"
-	"net/url"
-	"os"
-	"path/filepath"
-	"regexp"
-	"sort"
-	"strings"
-)
-
-type Frontmatter struct {
-	Slug           string
-	Aliases        []string
-	Draft          bool
-	Title          string
-	RelatedCards   []string
-	MentionedBooks []string
-}
-
-type Node struct {
-	ID    string `json:"id"`
-	Label string `json:"label"`
-	URL   string `json:"url"`
-}
-
-type Edge struct {
-	From string `json:"from"`
-	To   string `json:"to"`
-}
-
-var (
-	contentDir           = "content"
-	internalLinkPattern   = regexp.MustCompile(`$begin:math:display$[^$end:math:display$]*\]$begin:math:text$(/[^)]+)$end:math:text$`)
-	markdownLinkPattern   = regexp.MustCompile(`$begin:math:display$.*?$end:math:display$$begin:math:text$(http.*?)$end:math:text$`)
-	urlMap                = make(map[string]string)       // file path -> canonical url
-	aliasMap              = make(map[string]string)       // alias url -> canonical url
-	linkGraph             = make(map[string][]string)     // canonical url -> links
-	titleMap              = make(map[string]string)       // canonical url -> title
-	externalLinks         = make(map[string]int)          // domain -> count
-	excludedExternalHosts = map[string]bool{"image.guhub.cn": true, "www.geedea.pro": true}
-)
-
-func parseFrontmatter(filepath string) (Frontmatter, int) {
-	file, err := os.Open(filepath)
-	if err != nil {
-		return Frontmatter{}, 0
-	}
-	defer file.Close()
-
-	scanner := bufio.NewScanner(file)
-	if !scanner.Scan() || strings.TrimSpace(scanner.Text()) != "---" {
-		return Frontmatter{}, 0
-	}
-
-	fm := Frontmatter{}
-	lineNum := 1
-
-	for scanner.Scan() {
-		lineNum++
-		line := strings.TrimSpace(scanner.Text())
-		if line == "---" {
-			break
-		}
-
-		if strings.Contains(line, ":") {
-			parts := strings.SplitN(line, ":", 2)
-			key := strings.TrimSpace(parts[0])
-			value := strings.Trim(strings.TrimSpace(parts[1]), `"'`)
-
-			switch key {
-			case "aliases":
-				for scanner.Scan() {
-					next := strings.TrimSpace(scanner.Text())
-					lineNum++
-					if !strings.HasPrefix(next, "- ") {
-						break
-					}
-					fm.Aliases = append(fm.Aliases, strings.TrimSpace(next[2:]))
-				}
-			case "slug":
-				fm.Slug = value
-			case "draft":
-				fm.Draft = strings.ToLower(value) == "true"
-			case "title":
-				fm.Title = value
-			case "related_cards":
-				for scanner.Scan() {
-					next := strings.TrimSpace(scanner.Text())
-					lineNum++
-					if !strings.HasPrefix(next, "- ") {
-						break
-					}
-					fm.RelatedCards = append(fm.RelatedCards, strings.TrimSpace(next[2:]))
-				}
-			case "mentioned_books":
-				for scanner.Scan() {
-					next := strings.TrimSpace(scanner.Text())
-					lineNum++
-					if !strings.HasPrefix(next, "- ") {
-						break
-					}
-					fm.MentionedBooks = append(fm.MentionedBooks, strings.TrimSpace(next[2:]))
-				}
-			}
-		}
-	}
-	return fm, lineNum
-}
-
-func getCanonicalURL(path string, fm Frontmatter) string {
-	rel, _ := filepathRel(contentDir, path)
-	dir := filepath.Dir(rel)
-	base := strings.TrimSuffix(filepath.Base(path), ".md")
-	slug := fm.Slug
-	if slug == "" {
-		slug = strings.ToLower(base)
-	}
-
-	if dir != "." {
-		return fmt.Sprintf("/%s/%s/", filepathToSlash(dir), slug)
-	}
-	return fmt.Sprintf("/%s/", slug)
-}
-
-func resolveURL(u string) string {
-	if resolved, ok := aliasMap[u]; ok {
-		return resolved
-	}
-	return u
-}
-
-func resolveURLFromDir(link, subdir string) string {
-	targetDir := filepath.Join(contentDir, subdir)
-	for path, canonical := range urlMap {
-		if strings.HasPrefix(path, targetDir) {
-			name := strings.TrimSuffix(filepath.Base(path), ".md")
-			if name == link {
-				return canonical
-			}
-		}
-	}
-	return ""
-}
-
-func getIcon(u string) string {
-	switch {
-	case strings.HasPrefix(u, "/cards/"):
-		return "📄"
-	case strings.HasPrefix(u, "/posts/"):
-		return "📜"
-	case strings.HasPrefix(u, "/library/"):
-		return "📖"
-	case strings.HasPrefix(u, "/fictions/"):
-		return "🧙‍♀️"
-	case strings.HasPrefix(u, "/en/"):
-		return "🇬🇧"
-	default:
-		return "📁"
-	}
-}
-
-func collectURLs() {
-	filepath.WalkDir(contentDir, func(path string, d fs.DirEntry, err error) error {
-		if err != nil {
-			return err
-		}
-		if d.IsDir() || !strings.HasSuffix(d.Name(), ".md") || d.Name() == "_index.md" {
-			return nil
-		}
-
-		fm, _ := parseFrontmatter(path)
-		if fm.Draft {
-			return nil
-		}
-
-		canonical := getCanonicalURL(path, fm)
-		urlMap[path] = canonical
-		linkGraph[canonical] = []string{}
-
-		title := fm.Title
-		if title == "" {
-			title = strings.Trim(canonical, "/")
-			if parts := strings.Split(title, "/"); len(parts) > 0 {
-				title = parts[len(parts)-1]
-			}
-		}
-		titleMap[canonical] = fmt.Sprintf("%s %s", getIcon(canonical), title)
-
-		for _, alias := range fm.Aliases {
-			aliasMap[alias] = canonical
-		}
-
-		return nil
-	})
-}
-
-func buildGraphAndExternalLinks() {
-	for path, canonical := range urlMap {
-		content, err := os.ReadFile(path)
-		if err != nil {
-			continue
-		}
-		text := string(content)
-
-		// Internal links
-		for _, m := range internalLinkPattern.FindAllStringSubmatch(text, -1) {
-			link := resolveURL(m[1])
-			if _, ok := linkGraph[link]; ok {
-				linkGraph[canonical] = append(linkGraph[canonical], link)
-			}
-		}
-
-		// External links
-		for _, m := range markdownLinkPattern.FindAllStringSubmatch(text, -1) {
-			u, err := url.Parse(m[1])
-			if err == nil && u.Host != "" && !excludedExternalHosts[u.Host] {
-				externalLinks[u.Host]++
-			}
-		}
-
-		// Related cards and books
-		fm, _ := parseFrontmatter(path)
-		for _, card := range fm.RelatedCards {
-			if target := resolveURLFromDir(card, "cards"); target != "" {
-				linkGraph[canonical] = append(linkGraph[canonical], target)
-			}
-		}
-		for _, book := range fm.MentionedBooks {
-			if target := resolveURLFromDir(book, "library"); target != "" {
-				linkGraph[canonical] = append(linkGraph[canonical], target)
-			}
-		}
-	}
-}
-
-func main() {
-	collectURLs()
-	buildGraphAndExternalLinks()
-
-	os.MkdirAll("public", os.ModePerm)
-	os.MkdirAll("data", os.ModePerm)
-
-	// Write link-graph.json
-	var nodes []Node
-	var edges []Edge
-	for url, targets := range linkGraph {
-		nodes = append(nodes, Node{ID: url, Label: titleMap[url], URL: url})
-		for _, tgt := range targets {
-			edges = append(edges, Edge{From: url, To: tgt})
-		}
-	}
-	writeJSON("public/link-graph.json", map[string]interface{}{"nodes": nodes, "edges": edges})
-	fmt.Println("✅ Link graph generated: public/link-graph.json")
-
-	// Write externallinks.json
-	type kv struct {
-		Key   string
-		Count int
-	}
-	var sorted []kv
-	for domain, count := range externalLinks {
-		sorted = append(sorted, kv{domain, count})
-	}
-	sort.Slice(sorted, func(i, j int) bool { return sorted[i].Count > sorted[j].Count })
-
-	writeJSON("data/externallinks.json", sorted)
-	fmt.Println("✅ External link data written to data/externallinks.json")
-}
-
-func writeJSON(path string, data interface{}) {
-	file, err := os.Create(path)
-	if err != nil {
-		fmt.Println("❌ Error creating file:", err)
-		return
-	}
-	defer file.Close()
-
-	enc := json.NewEncoder(file)
-	enc.SetIndent("", "  ")
-	if err := enc.Encode(data); err != nil {
-		fmt.Println("❌ Error writing JSON:", err)
-	}
-}
-
-func filepathRel(base, target string) (string, error) {
-	rel, err := filepath.Rel(base, target)
-	if err != nil {
-		return "", err
-	}
-	return rel, nil
-}
-
-func filepathToSlash(p string) string {
-	return strings.ReplaceAll(p, string(os.PathSeparator), "/")
-}