Golang : Scan files for certain pattern and rename part of the files



Tags : golang rename partial pattern

It is useful to have the ability to scan filenames that match certain pattern and rename part of the filenames in a directory. This tutorial builds on from the previous tutorial on how to rename a file with Go.

This program below will first scan the given path for files with matching names and rename the first :

 package main

 import (
 "flag"
 "os"
 "path/filepath"
 "strings"
 )

 var flagPath = flag.String("path", "", "path to walk in search for dumb_* files.")

 func partialrename(path string, f os.FileInfo, err error) (e error) {

 // check each file if starts with the word "dumb_"

 if strings.HasPrefix(f.Name(), "dumb_") {
 base := filepath.Base(path) // get the file's basename
 dir := filepath.Dir(path)

 renameto := filepath.Join(dir, strings.Replace(base, "dumb_", "smart_", 1))
 os.Rename(path, renameto)
 }
 return
 }

 func init() {
 flag.Parse()
 }

 func main() {

 // check if the user specify a path
 if *flagPath == "" {
 flag.Usage() // if no, prompt usage
 os.Exit(0) // and exit
 }

 // walk through the files in the given path and perform partialrename()
 // function
 filepath.Walk(*flagPath, partialrename)
 }

Test output :

ls -la /Users/sweetlogic/testdir

total 0

drwxr-xr-x 5 sweetlogic staff 170 Oct 23 15:13 .

drwxr-xr-x+ 39 sweetlogic staff 1326 Oct 23 15:13 ..

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 dumb3.txt

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 dumb_1.txt

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 dumb_2.txt

and after executing ./renamepartial -path="/Users/sweetlogic/testdir"

ls -la /Users/sweetlogic/testdir

total 0

drwxr-xr-x 5 sweetlogic staff 170 Oct 23 15:14 .

drwxr-xr-x+ 39 sweetlogic staff 1326 Oct 23 15:13 ..

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 dumb3.txt

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 smart_1.txt

-rw-r--r-- 1 sweetlogic staff 0 Oct 23 15:13 smart_2.txt

the dumb3.txt file remains the same because its name doesn't match the strings.HasPrefix() patter of "dumb_".

Hope this tutorial can be useful for your work.

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  See also : Golang : Rename file



Tags : golang rename partial pattern

By Adam Ng

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