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496 lines (413 loc) · 13.8 KB
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package main
import (
"bufio"
"bytes"
"errors"
"fmt"
"os"
"regexp"
"strings"
flags "github.com/jessevdk/go-flags"
"github.com/remeh/sizedwaitgroup"
)
const (
Author = "webdevops.io"
)
var (
// Git version information
gitCommit = "<unknown>"
gitTag = "<unknown>"
)
type changeset struct {
SearchPlain string
Search *regexp.Regexp
Replace string
MatchFound bool
}
type changeresult struct {
File fileitem
Output string
Status bool
Error error
}
type fileitem struct {
Path string
Output string
}
var opts struct {
ThreadCount int ` long:"threads" description:"Set thread concurrency for replacing in multiple files at same time" default:"20"`
Mode string `short:"m" long:"mode" description:"replacement mode - replace: replace match with term; line: replace line with term; lineinfile: replace line with term or if not found append to term to file; template: parse content as golang template, search value have to start uppercase" default:"replace" choice:"replace" choice:"line" choice:"lineinfile" choice:"template"`
ModeIsReplaceMatch bool
ModeIsReplaceLine bool
ModeIsLineInFile bool
ModeIsTemplate bool
Search []string `short:"s" long:"search" description:"search term"`
Replace []string `short:"r" long:"replace" description:"replacement term"`
LineinfileBefore string ` long:"lineinfile-before" description:"add line before this regex"`
LineinfileAfter string ` long:"lineinfile-after" description:"add line after this regex"`
CaseInsensitive bool `short:"i" long:"case-insensitive" description:"ignore case of pattern to match upper and lowercase characters"`
Stdin bool ` long:"stdin" description:"process stdin as input"`
Output string `short:"o" long:"output" description:"write changes to this file (in one file mode)"`
OutputStripFileExt string ` long:"output-strip-ext" description:"strip file extension from written files (also available in multi file mode)"`
Once string ` long:"once" description:"replace search term only one in a file, keep duplicaes (keep, default) or remove them (unique)" optional:"true" optional-value:"keep" choice:"keep" choice:"unique"`
Regex bool ` long:"regex" description:"treat pattern as regex"`
RegexBackref bool ` long:"regex-backrefs" description:"enable backreferences in replace term"`
RegexPosix bool ` long:"regex-posix" description:"parse regex term as POSIX regex"`
Path string ` long:"path" description:"use files in this path"`
PathPattern string ` long:"path-pattern" description:"file pattern (* for wildcard, only basename of file)"`
PathRegex string ` long:"path-regex" description:"file pattern (regex, full path)"`
IgnoreEmpty bool ` long:"ignore-empty" description:"ignore empty file list, otherwise this will result in an error"`
Verbose bool `short:"v" long:"verbose" description:"verbose mode"`
DryRun bool ` long:"dry-run" description:"dry run mode"`
ShowVersion bool `short:"V" long:"version" description:"show version and exit"`
ShowOnlyVersion bool ` long:"dumpversion" description:"show only version number and exit"`
ShowHelp bool `short:"h" long:"help" description:"show this help message"`
}
var pathFilterDirectories = []string{"autom4te.cache", "blib", "_build", ".bzr", ".cdv", "cover_db", "CVS", "_darcs", "~.dep", "~.dot", ".git", ".hg", "~.nib", ".pc", "~.plst", "RCS", "SCCS", "_sgbak", ".svn", "_obj", ".idea"}
// Apply changesets to file
func applyChangesetsToFile(fileitem fileitem, changesets []changeset) (string, bool, error) {
var (
output = ""
status = true
)
// try open file
file, err := os.Open(fileitem.Path)
if err != nil {
return output, false, err
}
writeBufferToFile := false
var buffer bytes.Buffer
r := bufio.NewReader(file)
line, e := Readln(r)
for e == nil {
newLine, lineChanged, skipLine := applyChangesetsToLine(line, changesets)
if lineChanged || skipLine {
writeBufferToFile = true
}
if !skipLine {
buffer.WriteString(newLine + "\n")
}
line, e = Readln(r)
}
file.Close()
// --mode=lineinfile
if opts.ModeIsLineInFile {
lifBuffer, lifStatus := handleLineInFile(changesets, buffer)
if lifStatus {
buffer.Reset()
buffer.WriteString(lifBuffer.String())
writeBufferToFile = lifStatus
}
}
// --output
// --output-strip-ext
// enforcing writing of file (creating new file)
if opts.Output != "" || opts.OutputStripFileExt != "" {
writeBufferToFile = true
}
if writeBufferToFile {
output, status = writeContentToFile(fileitem, buffer)
} else {
output = fmt.Sprintf("%s no match", fileitem.Path)
}
return output, status, err
}
// Apply changesets to file
func applyTemplateToFile(fileitem fileitem, changesets []changeset) (string, bool, error) {
// try open file
buffer, err := os.ReadFile(fileitem.Path)
if err != nil {
return "", false, err
}
content := parseContentAsTemplate(string(buffer), changesets)
output, status := writeContentToFile(fileitem, content)
return output, status, err
}
func applyChangesetsToLine(line string, changesets []changeset) (string, bool, bool) {
changed := false
skipLine := false
for i, changeset := range changesets {
// --once, only do changeset once if already applied to file
if opts.Once != "" && changeset.MatchFound {
// --once=unique, skip matching lines
if opts.Once == "unique" && searchMatch(line, changeset) {
// matching line, not writing to buffer as requsted
skipLine = true
changed = true
break
}
} else {
// search and replace
if searchMatch(line, changeset) {
// --mode=line or --mode=lineinfile
if opts.ModeIsReplaceLine || opts.ModeIsLineInFile {
if opts.RegexBackref {
// get match
line = string(changeset.Search.Find([]byte(line)))
// replace regex backrefs in match
line = changeset.Search.ReplaceAllString(line, changeset.Replace)
} else {
// replace whole line with replace term
line = changeset.Replace
}
} else {
// replace only term inside line
line = replaceText(line, changeset)
}
changesets[i].MatchFound = true
changed = true
}
}
}
return line, changed, skipLine
}
// Build search term
// Compiles regexp if regexp is used
func buildSearchTerm(term string) *regexp.Regexp {
var ret *regexp.Regexp
var regex string
// --regex
if opts.Regex {
// use search term as regex
regex = term
} else {
// use search term as normal string, escape it for regex usage
regex = regexp.QuoteMeta(term)
}
// --ignore-case
if opts.CaseInsensitive {
regex = "(?i:" + regex + ")"
}
// --verbose
if opts.Verbose {
logMessage(fmt.Sprintf("Using regular expression: %s", regex))
}
// --regex-posix
if opts.RegexPosix {
ret = regexp.MustCompilePOSIX(regex)
} else {
ret = regexp.MustCompile(regex)
}
return ret
}
// handle special cli options
// eg. --help
//
// --version
// --path
// --mode=...
func handleSpecialCliOptions(args []string) {
// --dumpversion
if opts.ShowOnlyVersion {
fmt.Println(gitTag)
os.Exit(0)
}
// --version
if opts.ShowVersion {
fmt.Printf("go-replace version %s (%s)\n", gitTag, gitCommit)
fmt.Printf("Copyright (C) 2022 %s\n", Author)
os.Exit(0)
}
// --help
if opts.ShowHelp {
argparser.WriteHelp(os.Stdout)
os.Exit(0)
}
// --mode
switch mode := opts.Mode; mode {
case "replace":
opts.ModeIsReplaceMatch = true
opts.ModeIsReplaceLine = false
opts.ModeIsLineInFile = false
opts.ModeIsTemplate = false
case "line":
opts.ModeIsReplaceMatch = false
opts.ModeIsReplaceLine = true
opts.ModeIsLineInFile = false
opts.ModeIsTemplate = false
case "lineinfile":
opts.ModeIsReplaceMatch = false
opts.ModeIsReplaceLine = false
opts.ModeIsLineInFile = true
opts.ModeIsTemplate = false
case "template":
opts.ModeIsReplaceMatch = false
opts.ModeIsReplaceLine = false
opts.ModeIsLineInFile = false
opts.ModeIsTemplate = true
}
// --output
if opts.Output != "" && len(args) > 1 {
logFatalErrorAndExit(errors.New("only one file is allowed when using --output"), 1)
}
if opts.LineinfileBefore != "" || opts.LineinfileAfter != "" {
if !opts.ModeIsLineInFile {
logFatalErrorAndExit(errors.New("--lineinfile-after and --lineinfile-before only valid in --mode=lineinfile"), 1)
}
if opts.LineinfileBefore != "" && opts.LineinfileAfter != "" {
logFatalErrorAndExit(errors.New("only --lineinfile-after or --lineinfile-before is allowed in --mode=lineinfile"), 1)
}
}
}
func actionProcessStdinReplace(changesets []changeset) int {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
newLine, _, skipLine := applyChangesetsToLine(line, changesets)
if !skipLine {
fmt.Println(newLine)
}
}
return 0
}
func actionProcessStdinTemplate(changesets []changeset) int {
var buffer bytes.Buffer
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
buffer.WriteString(scanner.Text() + "\n")
}
content := parseContentAsTemplate(buffer.String(), changesets)
fmt.Print(content.String())
return 0
}
func actionProcessFiles(changesets []changeset, fileitems []fileitem) int {
// check if there is at least one file to process
if len(fileitems) == 0 {
if opts.IgnoreEmpty {
// no files found, but we should ignore empty filelist
logMessage("No files found, requsted to ignore this")
os.Exit(0)
} else {
// no files found, print error and exit with error code
logFatalErrorAndExit(errors.New("no files specified"), 1)
}
}
swg := sizedwaitgroup.New(8)
results := make(chan changeresult, len(fileitems))
// process file list
for _, file := range fileitems {
swg.Add()
go func(file fileitem, changesets []changeset) {
var (
err error
output string
status bool
)
if opts.ModeIsTemplate {
output, status, err = applyTemplateToFile(file, changesets)
} else {
output, status, err = applyChangesetsToFile(file, changesets)
}
results <- changeresult{file, output, status, err}
swg.Done()
}(file, changesets)
}
// wait for all changes to be processed
swg.Wait()
close(results)
// show results
errorCount := 0
for result := range results {
if result.Error != nil {
logError(result.Error)
errorCount++
} else if opts.Verbose {
title := fmt.Sprintf("%s:", result.File.Path)
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, title)
fmt.Fprintln(os.Stderr, strings.Repeat("-", len(title)))
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, result.Output)
fmt.Fprintln(os.Stderr, "")
}
}
if errorCount >= 1 {
fmt.Fprintf(os.Stderr, "[ERROR] %s failed with %d error(s)\n", argparser.Name, errorCount)
return 1
}
return 0
}
func buildChangesets() []changeset {
var changesets []changeset
if !opts.ModeIsTemplate {
if len(opts.Search) == 0 || len(opts.Replace) == 0 {
// error: unequal numbers of search and replace options
logFatalErrorAndExit(errors.New("missing either --search or --replace for this mode"), 1)
}
}
// check if search and replace options have equal lenght (equal number of options)
if len(opts.Search) != len(opts.Replace) {
// error: unequal numbers of search and replace options
logFatalErrorAndExit(errors.New("unequal numbers of search or replace options"), 1)
}
// build changesets
for i := range opts.Search {
search := opts.Search[i]
replace := opts.Replace[i]
changeset := changeset{search, buildSearchTerm(search), replace, false}
changesets = append(changesets, changeset)
}
return changesets
}
func buildFileitems(args []string) []fileitem {
var (
fileitems []fileitem
file fileitem
)
// Build filelist from arguments
for _, filepath := range args {
file = fileitem{filepath, filepath}
if opts.Output != "" {
// use specific output
file.Output = opts.Output
} else if opts.OutputStripFileExt != "" {
// remove file ext from saving destination
file.Output = strings.TrimSuffix(file.Output, opts.OutputStripFileExt)
} else if strings.Contains(filepath, ":") {
// argument like "source:destination"
split := strings.SplitN(filepath, ":", 2)
file.Path = split[0]
file.Output = split[1]
}
fileitems = append(fileitems, file)
}
// --path parsing
if opts.Path != "" {
searchFilesInPath(opts.Path, func(f os.FileInfo, filepath string) {
file := fileitem{filepath, filepath}
if opts.OutputStripFileExt != "" {
// remove file ext from saving destination
file.Output = strings.TrimSuffix(file.Output, opts.OutputStripFileExt)
}
// no colon parsing here
fileitems = append(fileitems, file)
})
}
return fileitems
}
var argparser *flags.Parser
func main() {
argparser = flags.NewParser(&opts, flags.PassDoubleDash)
args, err := argparser.Parse()
handleSpecialCliOptions(args)
// check if there is an parse error
if err != nil {
logFatalErrorAndExit(err, 1)
}
changesets := buildChangesets()
fileitems := buildFileitems(args)
exitMode := 0
if opts.Stdin {
if opts.ModeIsTemplate {
// use stdin as input
exitMode = actionProcessStdinTemplate(changesets)
} else {
// use stdin as input
exitMode = actionProcessStdinReplace(changesets)
}
} else {
// use and process files (see args)
exitMode = actionProcessFiles(changesets, fileitems)
}
os.Exit(exitMode)
}
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