mirror of
https://github.com/go-gitea/gitea.git
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278 lines
7.2 KiB
Go
278 lines
7.2 KiB
Go
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// Package editorconfig can be used to parse and generate editorconfig files.
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// For more information about editorconfig, see http://editorconfig.org/
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package editorconfig
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import (
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"bytes"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"gopkg.in/ini.v1"
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)
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// IndentStyle possible values
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const (
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IndentStyleTab = "tab"
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IndentStyleSpaces = "space"
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)
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// EndOfLine possible values
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const (
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EndOfLineLf = "lf"
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EndOfLineCr = "cr"
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EndOfLineCrLf = "crlf"
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)
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// Charset possible values
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const (
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CharsetLatin1 = "latin1"
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CharsetUTF8 = "utf-8"
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CharsetUTF16BE = "utf-16be"
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CharsetUTF16LE = "utf-16le"
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)
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// Definition represents a definition inside the .editorconfig file.
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// E.g. a section of the file.
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// The definition is composed of the selector ("*", "*.go", "*.{js.css}", etc),
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// plus the properties of the selected files.
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type Definition struct {
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Selector string `ini:"-" json:"-"`
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Charset string `ini:"charset" json:"charset,omitempty"`
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IndentStyle string `ini:"indent_style" json:"indent_style,omitempty"`
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IndentSize string `ini:"indent_size" json:"indent_size,omitempty"`
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TabWidth int `ini:"tab_width" json:"tab_width,omitempty"`
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EndOfLine string `ini:"end_of_line" json:"end_of_line,omitempty"`
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TrimTrailingWhitespace bool `ini:"trim_trailing_whitespace" json:"trim_trailing_whitespace,omitempty"`
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InsertFinalNewline bool `ini:"insert_final_newline" json:"insert_final_newline,omitempty"`
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}
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// Editorconfig represents a .editorconfig file.
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// It is composed by a "root" property, plus the definitions defined in the
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// file.
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type Editorconfig struct {
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Root bool
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Definitions []*Definition
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}
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// ParseBytes parses from a slice of bytes.
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func ParseBytes(data []byte) (*Editorconfig, error) {
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iniFile, err := ini.Load(data)
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if err != nil {
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return nil, err
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}
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editorConfig := &Editorconfig{}
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editorConfig.Root = iniFile.Section(ini.DEFAULT_SECTION).Key("root").MustBool(false)
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for _, sectionStr := range iniFile.SectionStrings() {
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if sectionStr == ini.DEFAULT_SECTION {
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continue
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}
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var (
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iniSection = iniFile.Section(sectionStr)
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definition = &Definition{}
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)
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err := iniSection.MapTo(&definition)
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if err != nil {
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return nil, err
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}
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// tab_width defaults to indent_size:
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// https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties#tab_width
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if definition.TabWidth <= 0 {
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if num, err := strconv.Atoi(definition.IndentSize); err == nil {
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definition.TabWidth = num
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}
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}
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definition.Selector = sectionStr
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editorConfig.Definitions = append(editorConfig.Definitions, definition)
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}
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return editorConfig, nil
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}
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// ParseFile parses from a file.
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func ParseFile(f string) (*Editorconfig, error) {
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data, err := ioutil.ReadFile(f)
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if err != nil {
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return nil, err
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}
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return ParseBytes(data)
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}
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var (
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regexpBraces = regexp.MustCompile("{.*}")
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)
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func filenameMatches(pattern, name string) bool {
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// basic match
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matched, _ := filepath.Match(pattern, name)
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if matched {
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return true
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}
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// foo/bar/main.go should match main.go
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matched, _ = filepath.Match(pattern, filepath.Base(name))
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if matched {
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return true
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}
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// foo should match foo/main.go
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matched, _ = filepath.Match(filepath.Join(pattern, "*"), name)
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if matched {
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return true
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}
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// *.{js,go} should match main.go
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if str := regexpBraces.FindString(pattern); len(str) > 0 {
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// remote initial "{" and final "}"
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str = strings.TrimPrefix(str, "{")
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str = strings.TrimSuffix(str, "}")
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// testing for empty brackets: "{}"
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if len(str) == 0 {
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patt := regexpBraces.ReplaceAllString(pattern, "*")
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matched, _ = filepath.Match(patt, filepath.Base(name))
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return matched
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}
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for _, patt := range strings.Split(str, ",") {
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patt = regexpBraces.ReplaceAllString(pattern, patt)
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matched, _ = filepath.Match(patt, filepath.Base(name))
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if matched {
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return true
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}
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}
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}
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return false
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}
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func (d *Definition) merge(md *Definition) {
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if len(d.Charset) == 0 {
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d.Charset = md.Charset
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}
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if len(d.IndentStyle) == 0 {
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d.IndentStyle = md.IndentStyle
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}
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if len(d.IndentSize) == 0 {
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d.IndentSize = md.IndentSize
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}
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if d.TabWidth <= 0 {
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d.TabWidth = md.TabWidth
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}
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if len(d.EndOfLine) == 0 {
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d.EndOfLine = md.EndOfLine
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}
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if !d.TrimTrailingWhitespace {
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d.TrimTrailingWhitespace = md.TrimTrailingWhitespace
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}
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if !d.InsertFinalNewline {
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d.InsertFinalNewline = md.InsertFinalNewline
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}
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}
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// GetDefinitionForFilename returns a definition for the given filename.
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// The result is a merge of the selectors that matched the file.
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// The last section has preference over the priors.
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func (e *Editorconfig) GetDefinitionForFilename(name string) *Definition {
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def := &Definition{}
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for i := len(e.Definitions) - 1; i >= 0; i-- {
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actualDef := e.Definitions[i]
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if filenameMatches(actualDef.Selector, name) {
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def.merge(actualDef)
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}
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}
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return def
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}
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func boolToString(b bool) string {
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if b {
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return "true"
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}
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return "false"
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}
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// Serialize converts the Editorconfig to a slice of bytes, containing the
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// content of the file in the INI format.
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func (e *Editorconfig) Serialize() ([]byte, error) {
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var (
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iniFile = ini.Empty()
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buffer = bytes.NewBuffer(nil)
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)
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iniFile.Section(ini.DEFAULT_SECTION).Comment = "http://editorconfig.org"
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if e.Root {
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iniFile.Section(ini.DEFAULT_SECTION).Key("root").SetValue(boolToString(e.Root))
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}
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for _, d := range e.Definitions {
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iniSec := iniFile.Section(d.Selector)
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if len(d.Charset) > 0 {
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iniSec.Key("charset").SetValue(d.Charset)
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}
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if len(d.IndentStyle) > 0 {
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iniSec.Key("indent_style").SetValue(d.IndentStyle)
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}
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if len(d.IndentSize) > 0 {
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iniSec.Key("indent_size").SetValue(d.IndentSize)
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}
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if d.TabWidth > 0 && strconv.Itoa(d.TabWidth) != d.IndentSize {
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iniSec.Key("tab_width").SetValue(strconv.Itoa(d.TabWidth))
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}
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if len(d.EndOfLine) > 0 {
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iniSec.Key("end_of_line").SetValue(d.EndOfLine)
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}
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if d.TrimTrailingWhitespace {
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iniSec.Key("trim_trailing_whitespace").SetValue(boolToString(d.TrimTrailingWhitespace))
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}
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if d.InsertFinalNewline {
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iniSec.Key("insert_final_newline").SetValue(boolToString(d.InsertFinalNewline))
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}
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}
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_, err := iniFile.WriteTo(buffer)
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if err != nil {
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return nil, err
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}
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return buffer.Bytes(), nil
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}
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// Save saves the Editorconfig to a compatible INI file.
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func (e *Editorconfig) Save(filename string) error {
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data, err := e.Serialize()
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if err != nil {
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return err
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}
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return ioutil.WriteFile(filename, data, 0666)
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}
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// GetDefinitionForFilename given a filename, searches
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// for .editorconfig files, starting from the file folder,
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// walking through the previous folders, until it reaches a
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// folder with `root = true`, and returns the right editorconfig
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// definition for the given file.
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func GetDefinitionForFilename(filename string) (*Definition, error) {
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abs, err := filepath.Abs(filename)
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if err != nil {
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return nil, err
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}
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definition := &Definition{}
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dir := abs
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for dir != filepath.Dir(dir) {
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dir = filepath.Dir(dir)
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ecFile := filepath.Join(dir, ".editorconfig")
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if _, err := os.Stat(ecFile); os.IsNotExist(err) {
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continue
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}
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ec, err := ParseFile(ecFile)
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if err != nil {
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return nil, err
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}
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definition.merge(ec.GetDefinitionForFilename(filename))
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if ec.Root {
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break
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}
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}
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return definition, nil
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}
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