feat: campos documentation, notes y code en registry

Añade campos documentation, notes y code a functions y types.
El parser extrae el contenido del .md y el código fuente del archivo
referenciado en file_path. El indexer los almacena en SQLite y los
incluye en FTS5 para búsqueda sobre código y documentación.
Nueva migración 003_documentation.sql para añadir las columnas.

cmd/fn/main.go

@@ -289,6 +289,15 @@ func printFunction(f *registry.Function) {
 	if f.Example != "" {
 		fmt.Printf("\nExample:\n%s\n", f.Example)
 	}
+	if f.Notes != "" {
+		fmt.Printf("\nNotes:\n%s\n", f.Notes)
+	}
+	if f.Documentation != "" {
+		fmt.Printf("\nDocumentation:\n%s\n", f.Documentation)
+	}
+	if f.Code != "" {
+		fmt.Printf("\nCode:\n%s\n", f.Code)
+	}
 	if f.Kind == registry.KindComponent {
 		fmt.Printf("Framework:   %s\n", f.Framework)
 		if f.HasState != nil {
@@ -316,6 +325,18 @@ func printType(t *registry.Type) {
 	if t.Definition != "" {
 		fmt.Printf("\nDefinition:\n%s\n", t.Definition)
 	}
+	if t.Examples != "" {
+		fmt.Printf("\nExamples:\n%s\n", t.Examples)
+	}
+	if t.Notes != "" {
+		fmt.Printf("\nNotes:\n%s\n", t.Notes)
+	}
+	if t.Documentation != "" {
+		fmt.Printf("\nDocumentation:\n%s\n", t.Documentation)
+	}
+	if t.Code != "" {
+		fmt.Printf("\nCode:\n%s\n", t.Code)
+	}
 }
 
 // --- add ---

registry/indexer.go

@@ -19,6 +19,9 @@ type IndexResult struct {
 // and populates the database. It uses two passes:
 // 1. Parse all entries and collect known IDs
 // 2. Validate references against known IDs, then insert valid entries
+//
+// Scans functions/ and types/ at the root level, plus any language-specific
+// directories (e.g. python/functions/, python/types/).
 func Index(db *DB, root string) (*IndexResult, error) {
 	if err := db.Purge(); err != nil {
 		return nil, fmt.Errorf("purging database: %w", err)
@@ -26,39 +29,50 @@ func Index(db *DB, root string) (*IndexResult, error) {
 
 	result := &IndexResult{}
 
-	// Pass 1: parse everything
+	// Pass 1: parse everything from all source directories
 	var functions []*Function
 	var types []*Type
 
-	functionsDir := filepath.Join(root, "functions")
-	if _, err := os.Stat(functionsDir); err == nil {
-		filepath.Walk(functionsDir, func(path string, info os.FileInfo, err error) error {
-			if err != nil || info.IsDir() || !strings.HasSuffix(path, ".md") {
-				return nil
+	// Directories to scan for functions and types.
+	// Base dirs + language-specific dirs discovered automatically.
+	funcDirs := []string{filepath.Join(root, "functions")}
+	typeDirs := []string{filepath.Join(root, "types")}
+
+	// Discover language-specific directories (e.g. python/functions/, python/types/)
+	entries, _ := os.ReadDir(root)
+	for _, e := range entries {
+		if !e.IsDir() {
+			continue
 		}
-			f, err := ParseFunctionMD(path)
+		langFuncs := filepath.Join(root, e.Name(), "functions")
+		if fi, err := os.Stat(langFuncs); err == nil && fi.IsDir() {
+			funcDirs = append(funcDirs, langFuncs)
+		}
+		langTypes := filepath.Join(root, e.Name(), "types")
+		if fi, err := os.Stat(langTypes); err == nil && fi.IsDir() {
+			typeDirs = append(typeDirs, langTypes)
+		}
+	}
+
+	for _, dir := range funcDirs {
+		walkMD(dir, func(path string) {
+			f, err := ParseFunctionMD(path, root)
 			if err != nil {
 				result.Errors = append(result.Errors, fmt.Sprintf("parse %s: %v", path, err))
-				return nil
+				return
 			}
 			functions = append(functions, f)
-			return nil
 		})
 	}
 
-	typesDir := filepath.Join(root, "types")
-	if _, err := os.Stat(typesDir); err == nil {
-		filepath.Walk(typesDir, func(path string, info os.FileInfo, err error) error {
-			if err != nil || info.IsDir() || !strings.HasSuffix(path, ".md") {
-				return nil
-			}
-			t, err := ParseTypeMD(path)
+	for _, dir := range typeDirs {
+		walkMD(dir, func(path string) {
+			t, err := ParseTypeMD(path, root)
 			if err != nil {
 				result.Errors = append(result.Errors, fmt.Sprintf("parse %s: %v", path, err))
-				return nil
+				return
 			}
 			types = append(types, t)
-			return nil
 		})
 	}
 
@@ -99,3 +113,17 @@ func Index(db *DB, root string) (*IndexResult, error) {
 
 	return result, nil
 }
+
+// walkMD walks a directory recursively and calls fn for each .md file found.
+func walkMD(dir string, fn func(path string)) {
+	if _, err := os.Stat(dir); err != nil {
+		return
+	}
+	filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil || info.IsDir() || !strings.HasSuffix(path, ".md") {
+			return nil
+		}
+		fn(path)
+		return nil
+	})
+}

registry/migrations/003_documentation.sql

@@ -0,0 +1,103 @@
+-- Add documentation fields to functions and types.
+-- examples: extracted code blocks from ## Ejemplo
+-- notes: extracted text from ## Notas
+-- documentation: remaining body text from .md
+-- code: source code from the referenced .go/.py/.tsx file
+
+ALTER TABLE functions ADD COLUMN notes         TEXT NOT NULL DEFAULT '';
+ALTER TABLE functions ADD COLUMN documentation  TEXT NOT NULL DEFAULT '';
+ALTER TABLE functions ADD COLUMN code           TEXT NOT NULL DEFAULT '';
+
+ALTER TABLE types ADD COLUMN examples      TEXT NOT NULL DEFAULT '';
+ALTER TABLE types ADD COLUMN notes         TEXT NOT NULL DEFAULT '';
+ALTER TABLE types ADD COLUMN documentation TEXT NOT NULL DEFAULT '';
+ALTER TABLE types ADD COLUMN code          TEXT NOT NULL DEFAULT '';
+
+-- Rebuild FTS for functions: add examples, notes, documentation, code
+DROP TRIGGER IF EXISTS functions_ai;
+DROP TRIGGER IF EXISTS functions_ad;
+DROP TRIGGER IF EXISTS functions_au;
+
+INSERT INTO functions_fts(functions_fts) VALUES('rebuild');
+DROP TABLE IF EXISTS functions_fts;
+
+CREATE VIRTUAL TABLE functions_fts USING fts5(
+    id,
+    name,
+    description,
+    tags,
+    signature,
+    domain,
+    example,
+    notes,
+    documentation,
+    code,
+    content='functions',
+    content_rowid='rowid'
+);
+
+-- Populate FTS from existing data
+INSERT INTO functions_fts(rowid, id, name, description, tags, signature, domain, example, notes, documentation, code)
+SELECT rowid, id, name, description, tags, signature, domain, example, notes, documentation, code
+FROM functions;
+
+CREATE TRIGGER functions_ai AFTER INSERT ON functions BEGIN
+    INSERT INTO functions_fts(rowid, id, name, description, tags, signature, domain, example, notes, documentation, code)
+    VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.signature, new.domain, new.example, new.notes, new.documentation, new.code);
+END;
+
+CREATE TRIGGER functions_ad AFTER DELETE ON functions BEGIN
+    INSERT INTO functions_fts(functions_fts, rowid, id, name, description, tags, signature, domain, example, notes, documentation, code)
+    VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.signature, old.domain, old.example, old.notes, old.documentation, old.code);
+END;
+
+CREATE TRIGGER functions_au AFTER UPDATE ON functions BEGIN
+    INSERT INTO functions_fts(functions_fts, rowid, id, name, description, tags, signature, domain, example, notes, documentation, code)
+    VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.signature, old.domain, old.example, old.notes, old.documentation, old.code);
+    INSERT INTO functions_fts(rowid, id, name, description, tags, signature, domain, example, notes, documentation, code)
+    VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.signature, new.domain, new.example, new.notes, new.documentation, new.code);
+END;
+
+-- Rebuild FTS for types: add examples, notes, documentation, code
+DROP TRIGGER IF EXISTS types_ai;
+DROP TRIGGER IF EXISTS types_ad;
+DROP TRIGGER IF EXISTS types_au;
+
+INSERT INTO types_fts(types_fts) VALUES('rebuild');
+DROP TABLE IF EXISTS types_fts;
+
+CREATE VIRTUAL TABLE types_fts USING fts5(
+    id,
+    name,
+    description,
+    tags,
+    domain,
+    examples,
+    notes,
+    documentation,
+    code,
+    content='types',
+    content_rowid='rowid'
+);
+
+-- Populate FTS from existing data
+INSERT INTO types_fts(rowid, id, name, description, tags, domain, examples, notes, documentation, code)
+SELECT rowid, id, name, description, tags, domain, examples, notes, documentation, code
+FROM types;
+
+CREATE TRIGGER types_ai AFTER INSERT ON types BEGIN
+    INSERT INTO types_fts(rowid, id, name, description, tags, domain, examples, notes, documentation, code)
+    VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.domain, new.examples, new.notes, new.documentation, new.code);
+END;
+
+CREATE TRIGGER types_ad AFTER DELETE ON types BEGIN
+    INSERT INTO types_fts(types_fts, rowid, id, name, description, tags, domain, examples, notes, documentation, code)
+    VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.domain, old.examples, old.notes, old.documentation, old.code);
+END;
+
+CREATE TRIGGER types_au AFTER UPDATE ON types BEGIN
+    INSERT INTO types_fts(types_fts, rowid, id, name, description, tags, domain, examples, notes, documentation, code)
+    VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.domain, old.examples, old.notes, old.documentation, old.code);
+    INSERT INTO types_fts(rowid, id, name, description, tags, domain, examples, notes, documentation, code)
+    VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.domain, new.examples, new.notes, new.documentation, new.code);
+END;

registry/models.go

@@ -47,6 +47,9 @@ type Function struct {
 	ErrorType       string   `json:"error_type"`
 	Imports         []string `json:"imports"`
 	Example         string   `json:"example"`
+	Notes           string   `json:"notes"`
+	Documentation   string   `json:"documentation"`
+	Code            string   `json:"code"`
 	Tested          bool     `json:"tested"`
 	Tests           []string `json:"tests"`
 	TestFilePath    string   `json:"test_file_path"`
@@ -82,6 +85,10 @@ type Type struct {
 	Description string   `json:"description"`
 	Tags       []string  `json:"tags"`
 	UsesTypes  []string  `json:"uses_types"`
+	Examples      string    `json:"examples"`
+	Notes         string    `json:"notes"`
+	Documentation string    `json:"documentation"`
+	Code          string    `json:"code"`
 	FilePath      string    `json:"file_path"`
 	CreatedAt     time.Time `json:"created_at"`
 	UpdatedAt     time.Time `json:"updated_at"`

registry/parser.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"gopkg.in/yaml.v3"
@@ -73,7 +74,8 @@ func extractFrontmatter(data []byte) ([]byte, []byte, error) {
 }
 
 // ParseFunctionMD parses a function .md file into a Function.
-func ParseFunctionMD(path string) (*Function, error) {
+// root is the registry root directory, used to resolve file_path for code reading.
+func ParseFunctionMD(path string, root string) (*Function, error) {
 	data, err := os.ReadFile(path)
 	if err != nil {
 		return nil, fmt.Errorf("reading %s: %w", path, err)
@@ -99,7 +101,7 @@ func ParseFunctionMD(path string) (*Function, error) {
 		return nil, fmt.Errorf("%s: description is required", path)
 	}
 
-	example := extractExample(body)
+	sections := extractSections(body)
 
 	f := &Function{
 		ID:              GenerateID(raw.Name, raw.Lang, raw.Domain),
@@ -118,6 +120,9 @@ func ParseFunctionMD(path string) (*Function, error) {
 		ReturnsOptional: raw.ReturnsOptional,
 		ErrorType:       raw.ErrorType,
 		Imports:         raw.Imports,
+		Example:         sections.example,
+		Notes:           sections.notes,
+		Documentation:   sections.documentation,
 		Tested:          raw.Tested,
 		Tests:           raw.Tests,
 		TestFilePath:    raw.TestFilePath,
@@ -129,21 +134,25 @@ func ParseFunctionMD(path string) (*Function, error) {
 		Variant:         raw.Variant,
 	}
 
-	if example != "" && f.Example == "" {
-		f.Example = example
+	if root != "" && raw.FilePath != "" {
+		codePath := filepath.Join(root, raw.FilePath)
+		if codeData, err := os.ReadFile(codePath); err == nil {
+			f.Code = string(codeData)
+		}
 	}
 
 	return f, nil
 }
 
 // ParseTypeMD parses a type .md file into a Type.
-func ParseTypeMD(path string) (*Type, error) {
+// root is the registry root directory, used to resolve file_path for code reading.
+func ParseTypeMD(path string, root string) (*Type, error) {
 	data, err := os.ReadFile(path)
 	if err != nil {
 		return nil, fmt.Errorf("reading %s: %w", path, err)
 	}
 
-	fm, _, err := extractFrontmatter(data)
+	fm, body, err := extractFrontmatter(data)
 	if err != nil {
 		return nil, fmt.Errorf("parsing %s: %w", path, err)
 	}
@@ -160,6 +169,8 @@ func ParseTypeMD(path string) (*Type, error) {
 		return nil, fmt.Errorf("%s: description is required", path)
 	}
 
+	sections := extractSections(body)
+
 	t := &Type{
 		ID:            GenerateID(raw.Name, raw.Lang, raw.Domain),
 		Name:          raw.Name,
@@ -171,38 +182,83 @@ func ParseTypeMD(path string) (*Type, error) {
 		Description:   raw.Description,
 		Tags:          raw.Tags,
 		UsesTypes:     raw.UsesTypes,
+		Examples:      sections.example,
+		Notes:         sections.notes,
+		Documentation: sections.documentation,
 		FilePath:      raw.FilePath,
 	}
 
+	if root != "" && raw.FilePath != "" {
+		codePath := filepath.Join(root, raw.FilePath)
+		if codeData, err := os.ReadFile(codePath); err == nil {
+			t.Code = string(codeData)
+		}
+	}
+
 	return t, nil
 }
 
-// extractExample pulls the first code block after an "## Ejemplo" heading.
-func extractExample(body []byte) string {
+// bodySections holds the extracted sections from a .md body.
+type bodySections struct {
+	example       string // content under ## Ejemplo
+	notes         string // content under ## Notas
+	documentation string // everything else
+}
+
+// extractSections splits the markdown body into named sections.
+// Known sections (## Ejemplo, ## Notas) are extracted separately.
+// All other content (including unknown ## headings) goes into documentation.
+func extractSections(body []byte) bodySections {
 	lines := strings.Split(string(body), "\n")
-	inExample := false
-	inCode := false
-	var code []string
+	var s bodySections
+
+	type section struct {
+		name  string
+		lines []string
+	}
+
+	var current *section
+	var sections []section
 
 	for _, line := range lines {
 		trimmed := strings.TrimSpace(line)
-		if strings.HasPrefix(trimmed, "## Ejemplo") {
-			inExample = true
+		if strings.HasPrefix(trimmed, "## ") {
+			if current != nil {
+				sections = append(sections, *current)
+			}
+			current = &section{name: trimmed}
 			continue
 		}
-		if inExample && !inCode && strings.HasPrefix(trimmed, "```") {
-			inCode = true
+		if current != nil {
+			current.lines = append(current.lines, line)
+		} else {
+			// Content before any ## heading goes to documentation
+			sections = append(sections, section{name: "_preamble", lines: []string{line}})
+		}
+	}
+	if current != nil {
+		sections = append(sections, *current)
+	}
+
+	var docParts []string
+	for _, sec := range sections {
+		content := strings.TrimSpace(strings.Join(sec.lines, "\n"))
+		if content == "" && sec.name == "_preamble" {
 			continue
 		}
-		if inCode {
-			if strings.HasPrefix(trimmed, "```") {
-				return strings.Join(code, "\n")
-			}
-			code = append(code, line)
-		}
-		if inExample && !inCode && strings.HasPrefix(trimmed, "##") {
-			break
+		switch {
+		case strings.HasPrefix(sec.name, "## Ejemplo"):
+			s.example = content
+		case strings.HasPrefix(sec.name, "## Notas"):
+			s.notes = content
+		case sec.name == "_preamble":
+			docParts = append(docParts, content)
+		default:
+			// Unknown sections go to documentation with their heading
+			docParts = append(docParts, sec.name+"\n\n"+content)
 		}
 	}
-	return ""
+	s.documentation = strings.TrimSpace(strings.Join(docParts, "\n\n"))
+
+	return s
 }

registry/parser_test.go

@@ -79,7 +79,7 @@ imports: [react]
 tested: false
 tests: []
 test_file_path: ""
-file_path: "functions/components/DataTable.tsx"
+file_path: "frontend/functions/ui/data_table.tsx"
 props:
   - name: data
     type: "T[]"
@@ -105,7 +105,7 @@ func writeTempFile(t *testing.T, dir, name, content string) string {
 func TestParseFunctionMD(t *testing.T) {
 	path := writeTempFile(t, t.TempDir(), "filter_slice.md", functionMD)
 
-	f, err := ParseFunctionMD(path)
+	f, err := ParseFunctionMD(path, "")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -130,7 +130,7 @@ func TestParseFunctionMD(t *testing.T) {
 func TestParseTypeMD(t *testing.T) {
 	path := writeTempFile(t, t.TempDir(), "ohlcv.md", typeMD)
 
-	typ, err := ParseTypeMD(path)
+	typ, err := ParseTypeMD(path, "")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -149,7 +149,7 @@ func TestParseTypeMD(t *testing.T) {
 func TestParseComponentMD(t *testing.T) {
 	path := writeTempFile(t, t.TempDir(), "DataTable.md", componentMD)
 
-	f, err := ParseFunctionMD(path)
+	f, err := ParseFunctionMD(path, "")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -174,7 +174,7 @@ func TestParseComponentMD(t *testing.T) {
 func TestParseMissingFrontmatter(t *testing.T) {
 	path := writeTempFile(t, t.TempDir(), "bad.md", "# No frontmatter here\n")
 
-	_, err := ParseFunctionMD(path)
+	_, err := ParseFunctionMD(path, "")
 	if err == nil {
 		t.Error("expected error for missing frontmatter")
 	}

registry/store.go

@@ -82,19 +82,22 @@ func (db *DB) InsertFunction(f *Function) error {
 			description, tags, uses_functions, uses_types, returns,
 			returns_optional, error_type, imports, example, tested,
 			tests, test_file_path, file_path, created_at, updated_at,
-			props, emits, has_state, framework, variant
+			props, emits, has_state, framework, variant,
+			notes, documentation, code
 		) VALUES (
 			?, ?, ?, ?, ?, ?, ?, ?,
 			?, ?, ?, ?, ?,
 			?, ?, ?, ?, ?,
 			?, ?, ?, ?, ?,
-			?, ?, ?, ?, ?
+			?, ?, ?, ?, ?,
+			?, ?, ?
 		)`,
 		f.ID, f.Name, string(f.Kind), f.Lang, f.Domain, f.Version, string(f.Purity), f.Signature,
 		f.Description, marshalStrings(f.Tags), marshalStrings(f.UsesFunctions), marshalStrings(f.UsesTypes), marshalStrings(f.Returns),
 		f.ReturnsOptional, f.ErrorType, marshalStrings(f.Imports), f.Example, f.Tested,
 		marshalStrings(f.Tests), f.TestFilePath, f.FilePath, f.CreatedAt.Format(time.RFC3339), now,
 		marshalProps(f.Props), marshalStrings(f.Emits), hasState, f.Framework, marshalStrings(f.Variant),
+		f.Notes, f.Documentation, f.Code,
 	)
 	return err
 }
@@ -115,11 +118,13 @@ func (db *DB) InsertType(t *Type) error {
 		INSERT OR REPLACE INTO types (
 			id, name, lang, domain, version, algebraic,
 			definition, description, tags, uses_types,
-			file_path, created_at, updated_at
-		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+			file_path, created_at, updated_at,
+			examples, notes, documentation, code
+		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
 		t.ID, t.Name, t.Lang, t.Domain, t.Version, string(t.Algebraic),
 		t.Definition, t.Description, marshalStrings(t.Tags), marshalStrings(t.UsesTypes),
 		t.FilePath, t.CreatedAt.Format(time.RFC3339), now,
+		t.Examples, t.Notes, t.Documentation, t.Code,
 	)
 	return err
 }
@@ -270,6 +275,7 @@ func scanFunctions(rows interface{ Next() bool; Scan(...any) error }) ([]Functio
 			&f.ReturnsOptional, &f.ErrorType, &importsJSON, &f.Example, &f.Tested,
 			&testsJSON, &f.TestFilePath, &f.FilePath, &createdAt, &updatedAt,
 			&propsJSON, &emitsJSON, &hasState, &f.Framework, &variantJSON,
+			&f.Notes, &f.Documentation, &f.Code,
 		)
 		if err != nil {
 			return nil, fmt.Errorf("scanning function: %w", err)
@@ -308,6 +314,7 @@ func scanTypes(rows interface{ Next() bool; Scan(...any) error }) ([]Type, error
 			&t.ID, &t.Name, &t.Lang, &t.Domain, &t.Version, &t.Algebraic,
 			&t.Definition, &t.Description, &tagsJSON, &usesTypJSON,
 			&t.FilePath, &createdAt, &updatedAt,
+			&t.Examples, &t.Notes, &t.Documentation, &t.Code,
 		)
 		if err != nil {
 			return nil, fmt.Errorf("scanning type: %w", err)