61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package registry
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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)
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// emitModuleVersionHeader writes <dir_path>/version_generated.h for a module.
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// The header exposes constants the C++ side can read:
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//
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// FN_MODULE_<NAME>_VERSION (const char*)
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// FN_MODULE_<NAME>_NAME (const char*)
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// FN_MODULE_<NAME>_DESCRIPTION (const char*)
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//
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// For C++ modules only (lang == "cpp"). For other langs, returns nil silently.
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// Idempotent: only rewrites when content differs.
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func emitModuleVersionHeader(m *Module, root string) error {
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if m.Lang != "cpp" {
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return nil
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}
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if m.DirPath == "" {
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return nil
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}
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upper := strings.ToUpper(m.Name)
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macroPrefix := "FN_MODULE_" + upper
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guard := macroPrefix + "_VERSION_GENERATED_H"
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body := fmt.Sprintf(`// Auto-generated by `+"`fn index`"+` — do not edit.
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// Module: %s
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// Source of truth: modules/%s/module.md
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#ifndef %s
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#define %s
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#define %s_NAME %q
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#define %s_VERSION %q
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#define %s_DESCRIPTION %q
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#endif // %s
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`, m.Name, m.Name,
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guard, guard,
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macroPrefix, m.Name,
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macroPrefix, m.Version,
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macroPrefix, m.Description,
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guard)
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headerPath := filepath.Join(root, m.DirPath, "version_generated.h")
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// Idempotent: skip write when content already matches.
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if existing, err := os.ReadFile(headerPath); err == nil && string(existing) == body {
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return nil
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}
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if err := os.MkdirAll(filepath.Dir(headerPath), 0o755); err != nil {
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return fmt.Errorf("mkdir %s: %w", filepath.Dir(headerPath), err)
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}
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return os.WriteFile(headerPath, []byte(body), 0o644)
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}
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