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package main
import (
"encoding/json"
"fmt"
"io/fs"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
)
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"`
}
func main() {
root := "content"
nodes := map[string]Node{}
edges := make([]Edge, 0) // non-nil so it becomes [] not null
err := filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
if err != nil || d.IsDir() || !strings.HasSuffix(strings.ToLower(path), ".md") {
return nil
}
rel, err := filepath.Rel(root, path)
if err != nil {
return nil
}
rel = filepath.ToSlash(rel)
urlPath := "/" + strings.TrimSuffix(rel, ".md") + "/"
label := strings.TrimSuffix(filepath.Base(path), ".md")
nodes[urlPath] = Node{ID: urlPath, Label: label, URL: urlPath}
data, err := os.ReadFile(path)
if err != nil {
return nil
}
content := string(data)
linkPattern := regexp.MustCompile(`\[[^\]]*\]\((/[^)]+)\)`)
matches := linkPattern.FindAllStringSubmatch(content, -1)
for _, m := range matches {
link := strings.TrimSuffix(m[1], ".md")
if !strings.HasSuffix(link, "/") {
link += "/"
}
edges = append(edges, Edge{From: urlPath, To: link})
}
return nil
})
if err != nil {
fmt.Println("WalkDir error:", err)
return
}
nodeKeys := make([]string, 0, len(nodes))
for k := range nodes {
nodeKeys = append(nodeKeys, k)
}
sort.Strings(nodeKeys)
nodeList := make([]Node, 0, len(nodeKeys))
for _, k := range nodeKeys {
nodeList = append(nodeList, nodes[k])
}
os.MkdirAll("static", os.ModePerm)
output := map[string]interface{}{
"nodes": nodeList,
"edges": edges,
}
outfile := "static/link-graph.json"
f, err := os.Create(outfile)
if err != nil {
fmt.Println("create file error:", err)
return
}
defer f.Close()
enc := json.NewEncoder(f)
enc.SetIndent("", " ")
if err := enc.Encode(output); err != nil {
fmt.Println("json encode error:", err)
}
fmt.Printf("✅ Link graph written to %s (%d nodes, %d edges)\n", outfile, len(nodeList), len(edges))
}
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