claude: fold in old sow-tools

2026-06-13 09:49:29 +02:00
parent cdabf69aa2
commit cf89c166fe
112 changed files with 70812 additions and 74 deletions
@@ -0,0 +1,246 @@
+package topdata
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+type jsonFileFormatting struct {
+	Indent       string
+	LineEnding   string
+	FinalNewline bool
+}
+
+type editorConfigDocument struct {
+	Dir      string
+	Root     bool
+	Sections []editorConfigSection
+}
+
+type editorConfigSection struct {
+	Pattern    string
+	Properties map[string]string
+}
+
+func defaultJSONFileFormatting() jsonFileFormatting {
+	return jsonFileFormatting{
+		Indent:       "  ",
+		LineEnding:   "\n",
+		FinalNewline: true,
+	}
+}
+
+func resolveJSONFileFormatting(path string) (jsonFileFormatting, error) {
+	formatting := defaultJSONFileFormatting()
+	documents, err := editorConfigDocumentsForPath(path)
+	if err != nil {
+		return jsonFileFormatting{}, err
+	}
+	for _, document := range documents {
+		relative, err := filepath.Rel(document.Dir, path)
+		if err != nil {
+			return jsonFileFormatting{}, fmt.Errorf("resolve editorconfig path for %s relative to %s: %w", path, document.Dir, err)
+		}
+		relative = filepath.ToSlash(relative)
+		if strings.HasPrefix(relative, "../") || relative == ".." {
+			continue
+		}
+		for _, section := range document.Sections {
+			matches, err := editorConfigPatternMatches(section.Pattern, relative)
+			if err != nil {
+				return jsonFileFormatting{}, fmt.Errorf("%s/.editorconfig section [%s]: %w", document.Dir, section.Pattern, err)
+			}
+			if !matches {
+				continue
+			}
+			next, err := applyEditorConfigProperties(formatting, section.Properties)
+			if err != nil {
+				return jsonFileFormatting{}, fmt.Errorf("%s/.editorconfig section [%s]: %w", document.Dir, section.Pattern, err)
+			}
+			formatting = next
+		}
+	}
+	return formatting, nil
+}
+
+func editorConfigDocumentsForPath(path string) ([]editorConfigDocument, error) {
+	dir := filepath.Dir(path)
+	documents := []editorConfigDocument{}
+	for {
+		configPath := filepath.Join(dir, ".editorconfig")
+		raw, err := os.ReadFile(configPath)
+		if err == nil {
+			document, err := parseEditorConfig(configPath, raw)
+			if err != nil {
+				return nil, err
+			}
+			document.Dir = dir
+			documents = append(documents, document)
+			if document.Root {
+				break
+			}
+		} else if !os.IsNotExist(err) {
+			return nil, fmt.Errorf("read %s: %w", configPath, err)
+		}
+
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			break
+		}
+		dir = parent
+	}
+	for left, right := 0, len(documents)-1; left < right; left, right = left+1, right-1 {
+		documents[left], documents[right] = documents[right], documents[left]
+	}
+	return documents, nil
+}
+
+func parseEditorConfig(path string, raw []byte) (editorConfigDocument, error) {
+	document := editorConfigDocument{}
+	scanner := bufio.NewScanner(bytes.NewReader(raw))
+	var current *editorConfigSection
+	for lineNumber := 1; scanner.Scan(); lineNumber++ {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "#") || strings.HasPrefix(line, ";") {
+			continue
+		}
+		if strings.HasPrefix(line, "[") {
+			end := strings.LastIndex(line, "]")
+			if end < 0 {
+				return editorConfigDocument{}, fmt.Errorf("%s:%d: malformed section header", path, lineNumber)
+			}
+			section := editorConfigSection{
+				Pattern:    strings.TrimSpace(line[1:end]),
+				Properties: map[string]string{},
+			}
+			document.Sections = append(document.Sections, section)
+			current = &document.Sections[len(document.Sections)-1]
+			continue
+		}
+
+		index := strings.IndexAny(line, "=:")
+		if index < 0 {
+			return editorConfigDocument{}, fmt.Errorf("%s:%d: expected key/value property", path, lineNumber)
+		}
+		key := strings.ToLower(strings.TrimSpace(line[:index]))
+		value := strings.TrimSpace(line[index+1:])
+		if current == nil {
+			if key == "root" {
+				document.Root = strings.EqualFold(value, "true")
+			}
+			continue
+		}
+		current.Properties[key] = value
+	}
+	if err := scanner.Err(); err != nil {
+		return editorConfigDocument{}, fmt.Errorf("scan %s: %w", path, err)
+	}
+	return document, nil
+}
+
+func applyEditorConfigProperties(formatting jsonFileFormatting, properties map[string]string) (jsonFileFormatting, error) {
+	style := strings.ToLower(strings.TrimSpace(properties["indent_style"]))
+	sizeText := strings.ToLower(strings.TrimSpace(properties["indent_size"]))
+	if style == "tab" {
+		formatting.Indent = "\t"
+	} else if style != "" && style != "space" && style != "unset" {
+		return jsonFileFormatting{}, fmt.Errorf("unsupported indent_style %q", properties["indent_style"])
+	}
+	if sizeText != "" && sizeText != "unset" && sizeText != "tab" {
+		size, err := strconv.Atoi(sizeText)
+		if err != nil || size < 1 {
+			return jsonFileFormatting{}, fmt.Errorf("indent_size must be a positive integer, got %q", properties["indent_size"])
+		}
+		if style != "tab" {
+			formatting.Indent = strings.Repeat(" ", size)
+		}
+	}
+
+	switch value := strings.ToLower(strings.TrimSpace(properties["end_of_line"])); value {
+	case "", "unset":
+	case "lf":
+		formatting.LineEnding = "\n"
+	case "crlf":
+		formatting.LineEnding = "\r\n"
+	case "cr":
+		formatting.LineEnding = "\r"
+	default:
+		return jsonFileFormatting{}, fmt.Errorf("unsupported end_of_line %q", properties["end_of_line"])
+	}
+
+	switch value := strings.ToLower(strings.TrimSpace(properties["insert_final_newline"])); value {
+	case "", "unset":
+	case "true":
+		formatting.FinalNewline = true
+	case "false":
+		formatting.FinalNewline = false
+	default:
+		return jsonFileFormatting{}, fmt.Errorf("insert_final_newline must be true or false, got %q", properties["insert_final_newline"])
+	}
+	return formatting, nil
+}
+
+func editorConfigPatternMatches(pattern, relativePath string) (bool, error) {
+	pattern = filepath.ToSlash(strings.TrimSpace(pattern))
+	pattern = strings.TrimPrefix(pattern, "/")
+	if pattern == "" {
+		return false, nil
+	}
+	if !strings.Contains(pattern, "/") {
+		relativePath = pathBase(relativePath)
+	}
+	expression, err := editorConfigGlobRegexp(pattern)
+	if err != nil {
+		return false, err
+	}
+	return regexp.MatchString(expression, relativePath)
+}
+
+func editorConfigGlobRegexp(pattern string) (string, error) {
+	var builder strings.Builder
+	builder.WriteByte('^')
+	for index := 0; index < len(pattern); {
+		char := pattern[index]
+		switch char {
+		case '*':
+			if index+1 < len(pattern) && pattern[index+1] == '*' {
+				if index+2 < len(pattern) && pattern[index+2] == '/' {
+					builder.WriteString("(?:.*/)?")
+					index += 3
+				} else {
+					builder.WriteString(".*")
+					index += 2
+				}
+				continue
+			}
+			builder.WriteString("[^/]*")
+		case '?':
+			builder.WriteString("[^/]")
+		case '.', '+', '(', ')', '|', '^', '$', '{', '}', '[', ']', '\\':
+			builder.WriteByte('\\')
+			builder.WriteByte(char)
+		default:
+			builder.WriteByte(char)
+		}
+		index++
+	}
+	builder.WriteByte('$')
+	expression := builder.String()
+	if _, err := regexp.Compile(expression); err != nil {
+		return "", err
+	}
+	return expression, nil
+}
+
+func pathBase(path string) string {
+	if index := strings.LastIndex(path, "/"); index >= 0 {
+		return path[index+1:]
+	}
+	return path
+}