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package showcase
import (
"fmt"
"io/fs"
"os"
"path/filepath"
"sort"
"strings"
)
// buildAIInputContext prepares a textual context for AI tools when no README exists.
// It returns a string to be piped to the AI tool's stdin and a boolean indicating
// whether this was sourced from an actual README (true) or synthesized (false).
func buildAIInputContext(repoPath string) (string, bool) {
// 1) Try to load a README first
readmeFiles := []string{
"README.md", "readme.md", "Readme.md",
"README.MD", "README.txt", "readme.txt",
"README", "readme",
}
for _, f := range readmeFiles {
p := filepath.Join(repoPath, f)
if b, err := os.ReadFile(p); err == nil {
return string(b), true
}
}
// 2) No README: synthesize compact context
var sb strings.Builder
// File tree (depth-limited)
sb.WriteString("[CONTEXT]\n")
sb.WriteString("Repository does not contain a README.\n")
sb.WriteString("The following is a compact file tree and key manifests/snippets.\n\n")
sb.WriteString("FILE TREE (depth 2):\n")
tree := listFileTree(repoPath, 2, 200)
for _, line := range tree {
sb.WriteString("- ")
sb.WriteString(line)
sb.WriteString("\n")
}
sb.WriteString("\n")
// Key manifests we often care about
manifests := []string{
"go.mod", "go.sum", "package.json", "Cargo.toml", "Cargo.lock",
"pyproject.toml", "requirements.txt", "Makefile", "Dockerfile",
"build.gradle", "pom.xml", "composer.json",
}
wroteHeader := false
for _, m := range manifests {
p := filepath.Join(repoPath, m)
if b, err := os.ReadFile(p); err == nil {
if !wroteHeader {
sb.WriteString("KEY MANIFESTS:\n")
wroteHeader = true
}
sb.WriteString(fmt.Sprintf("--- %s ---\n", m))
sb.WriteString(trimTo(string(b), 2000))
sb.WriteString("\n\n")
}
}
// Source hints: capture first main-ish entry file snippets
// Priority: Go main, Rust main, Node entry, Python main
candidates := []string{
"cmd", // Go convention
"main.go",
"cmd/main.go",
"src/main.rs",
"index.js",
"src/index.js",
"main.py",
"src/main.py",
}
wroteSrc := false
for _, c := range candidates {
p := filepath.Join(repoPath, c)
info, err := os.Stat(p)
if err != nil {
continue
}
if info.IsDir() {
// collect a few go files under cmd/*/main.go
if c == "cmd" {
_ = filepath.WalkDir(p, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return nil
}
if d.IsDir() {
return nil
}
base := filepath.Base(path)
if base == "main.go" {
if b, e := os.ReadFile(path); e == nil {
if !wroteSrc {
sb.WriteString("PRIMARY SOURCE SNIPPETS:\n")
wroteSrc = true
}
rel, _ := filepath.Rel(repoPath, path)
sb.WriteString(fmt.Sprintf("--- %s ---\n", rel))
sb.WriteString(trimTo(string(b), 2000))
sb.WriteString("\n\n")
}
}
return nil
})
}
continue
}
if b, e := os.ReadFile(p); e == nil {
if !wroteSrc {
sb.WriteString("PRIMARY SOURCE SNIPPETS:\n")
wroteSrc = true
}
rel, _ := filepath.Rel(repoPath, p)
sb.WriteString(fmt.Sprintf("--- %s ---\n", rel))
sb.WriteString(trimTo(string(b), 2000))
sb.WriteString("\n\n")
}
}
// Fallback: include a few top-level .go, .rs, .py, .js files if we still have nothing
if !wroteSrc {
topFiles := listTopFiles(repoPath, []string{".go", ".rs", ".py", ".js", ".ts", ".tsx"}, 5)
for _, f := range topFiles {
if b, e := os.ReadFile(filepath.Join(repoPath, f)); e == nil {
if !wroteSrc {
sb.WriteString("PRIMARY SOURCE SNIPPETS:\n")
wroteSrc = true
}
sb.WriteString(fmt.Sprintf("--- %s ---\n", f))
sb.WriteString(trimTo(string(b), 2000))
sb.WriteString("\n\n")
}
}
}
// Instruction to the model
sb.WriteString("[TASK]\n")
sb.WriteString("Summarize this project in 1–2 paragraphs: what it does, why it's useful, and how it's implemented. Mention notable tech choices. Be concise and informative.\n")
return sb.String(), false
}
// listFileTree returns a sorted list of relative paths up to a given depth and limit.
func listFileTree(root string, maxDepth int, maxEntries int) []string {
var entries []string
var count int
_ = filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return nil
}
if path == root {
return nil
}
rel, e := filepath.Rel(root, path)
if e != nil {
return nil
}
// depth check
depth := 1 + strings.Count(rel, string(os.PathSeparator))
if depth > maxDepth {
return fs.SkipDir
}
entries = append(entries, rel)
count++
if count >= maxEntries {
return fs.SkipDir
}
return nil
})
sort.Strings(entries)
if len(entries) > maxEntries {
entries = entries[:maxEntries]
}
return entries
}
// listTopFiles lists top-level files with certain extensions up to a limit.
func listTopFiles(root string, exts []string, limit int) []string {
dir, err := os.ReadDir(root)
if err != nil {
return nil
}
var out []string
for _, e := range dir {
if e.IsDir() {
continue
}
name := e.Name()
for _, x := range exts {
if strings.HasSuffix(strings.ToLower(name), strings.ToLower(x)) {
out = append(out, name)
break
}
}
if len(out) >= limit {
break
}
}
sort.Strings(out)
return out
}
// trimTo soft-limits content length for inclusion in AI context.
func trimTo(s string, max int) string {
if len(s) <= max {
return s
}
return s[:max] + "\n... [truncated]"
}
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