move: empty files finder to root

17-project-empty-file-finder/01-fetch-the-files/files/nonEmpty1.txt

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+learngoprogramming.com

17-project-empty-file-finder/01-fetch-the-files/files/nonEmpty2.txt

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+learngoprogramming.com

17-project-empty-file-finder/01-fetch-the-files/files/nonEmpty3.txt

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+learngoprogramming.com

17-project-empty-file-finder/01-fetch-the-files/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) == 0 {
+		fmt.Println("Provide a directory")
+		return
+	}
+
+	files, err := ioutil.ReadDir(args[0])
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	for _, file := range files {
+		if file.Size() == 0 {
+			name := file.Name()
+			fmt.Println(name)
+		}
+	}
+}

17-project-empty-file-finder/02-write-to-a-file/files/nonEmpty1.txt

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+learngoprogramming.com

17-project-empty-file-finder/02-write-to-a-file/files/nonEmpty2.txt

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+learngoprogramming.com

17-project-empty-file-finder/02-write-to-a-file/files/nonEmpty3.txt

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+learngoprogramming.com

17-project-empty-file-finder/02-write-to-a-file/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) == 0 {
+		fmt.Println("Provide a directory")
+		return
+	}
+
+	files, err := ioutil.ReadDir(args[0])
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	var names []byte
+
+	for _, file := range files {
+		if file.Size() == 0 {
+			name := file.Name()
+
+			names = append(names, name...)
+			names = append(names, '\n')
+		}
+	}
+
+	err = ioutil.WriteFile("out.txt", names, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("%s", names)
+}
+
+// See: https://www.tutorialspoint.com/unix/unix-file-permission.htm
+// See: http://permissions-calculator.org/

17-project-empty-file-finder/03-optimize/files/nonEmpty1.txt

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+learngoprogramming.com

17-project-empty-file-finder/03-optimize/files/nonEmpty2.txt

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+learngoprogramming.com

17-project-empty-file-finder/03-optimize/files/nonEmpty3.txt

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+learngoprogramming.com

17-project-empty-file-finder/03-optimize/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+// You can easily write to a file using bash.
+//
+// However, when what you're creating is a library,
+// then you won't have that option. So, it's good to learn
+// how to write to a file using a byte slice.
+
+// ioutil.ReadDir
+// os.FileInfo
+
+func main() {
+	args := os.Args[1:]
+	if len(args) == 0 {
+		fmt.Println("Provide a directory")
+		return
+	}
+
+	files, err := ioutil.ReadDir(args[0])
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	// 1st: find the total size of all the empty files
+	var total int
+	for _, file := range files {
+		if file.Size() == 0 {
+			// +1 for the newline character
+			// when printing the filename
+			total += len(file.Name()) + 1
+		}
+	}
+
+	// 2nd: allocate a large enough byte slice in one go
+	names := make([]byte, 0, total)
+
+	for _, file := range files {
+		if file.Size() == 0 {
+			name := file.Name()
+
+			names = append(names, name...)
+			names = append(names, '\n')
+		}
+	}
+
+	err = ioutil.WriteFile("out.txt", names, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("%s", names)
+}
+
+// See: https://www.tutorialspoint.com/unix/unix-file-permission.htm
+// See: http://permissions-calculator.org/

17-project-empty-file-finder/exercises/1-sort-to-a-file/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Sort to a file
+//
+//  1. Get arguments from command-line
+//
+//  2. Sort them
+//
+//  3. Write the sorted slice to a file
+//
+//
+// EXPECTED OUTPUT
+//
+//   go run main.go
+//     Send me some items and I will sort them
+//
+//   go run main.go orange banana apple
+//
+//   cat sorted.txt
+//     apple
+//     banana
+//     orange
+//
+//
+// HINTS
+//
+//   ONLY READ THIS IF YOU GET STUCK
+//
+//   Below, []string means string slice, []byte means byte slice.
+//
+//   + You can use the os.Args[1:] to get a []string
+//   + Then you can sort it using sort.Strings
+//   + Use ioutil.WriteFile to write to a file.
+//   + But you need to convert []string to []byte to be able to
+//     write it to a file using the ioutil.WriteFile.
+//   + To do that, create a new []byte and append the elements of your
+//     []string.
+// ---------------------------------------------------------
+
+func main() {
+}

17-project-empty-file-finder/exercises/1-sort-to-a-file/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"sort"
+)
+
+func main() {
+	items := os.Args[1:]
+	if len(items) == 0 {
+		fmt.Println("Send me some items and I will sort them")
+		return
+	}
+
+	sort.Strings(items)
+
+	var data []byte
+	for _, s := range items {
+		data = append(data, s...)
+		data = append(data, '\n')
+	}
+
+	err := ioutil.WriteFile("sorted.txt", data, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}

17-project-empty-file-finder/exercises/2-sort-to-a-file-2/main.go

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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"sort"
+)
+
+// ---------------------------------------------------------
+// EXERCISE: Sort to a file with ordinals
+//
+//  Use the previous exercise: Append #4
+//
+//  This time, print the sorted items with ordinals
+//  (see the expected output)
+//
+//
+// EXPECTED OUTPUT
+//
+//   go run main.go
+//     Send me some items and I will sort them
+//
+//   go run main.go orange banana apple
+//
+//   cat sorted.txt
+//     1. apple
+//     2. banana
+//     3. orange
+//
+//
+// HINTS
+//
+//   ONLY READ THIS IF YOU GET STUCK
+//
+//   + You can use strconv.AppendInt function to append an int
+//     to a byte slice. strconv contains a lot of functions for appending
+//     other basic types as well.
+//
+//   + You can append individual characters to a byte slice using
+//     rune literals:
+//
+//     var slice []byte
+//     slice = append(slice, 'h', 'i', ' ', '!')
+//     fmt.Printf("%s\n", slice)
+//
+//     Above code prints: hi !
+// ---------------------------------------------------------
+
+func main() {
+	items := os.Args[1:]
+	if len(items) == 0 {
+		fmt.Println("Send me some items and I will sort them")
+		return
+	}
+
+	sort.Strings(items)
+
+	var data []byte
+	for _, s := range items {
+		data = append(data, s...)
+		data = append(data, '\n')
+	}
+
+	err := ioutil.WriteFile("sorted.txt", data, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}

17-project-empty-file-finder/exercises/2-sort-to-a-file-2/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"sort"
+	"strconv"
+)
+
+func main() {
+	items := os.Args[1:]
+	if len(items) == 0 {
+		fmt.Println("Send me some items and I will sort them")
+		return
+	}
+
+	sort.Strings(items)
+
+	var data []byte
+	for i, s := range items {
+		data = strconv.AppendInt(data, int64(i+1), 10)
+		data = append(data, '.', ' ')
+		data = append(data, s...)
+		data = append(data, '\n')
+	}
+
+	err := ioutil.WriteFile("sorted.txt", data, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}

17-project-empty-file-finder/exercises/3-print-directories/main.go

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+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Print the directories
+//
+//  Create a program that can get multiple directory paths from
+//  the command-line, and prints only their subdirectories into a
+//  file named: dirs.txt
+//
+//
+//  1. Get the directory paths from command-line
+//
+//  2. Append the names of subdirectories inside each directory
+//     to a byte slice
+//
+//  3. Write that byte slice to dirs.txt file
+//
+//
+// EXPECTED OUTPUT
+//
+//   go run main.go
+//     Please provide directory paths
+//
+//   go run main.go dir/ dir2/
+//
+//   cat dirs.txt
+//
+//     dir/
+//             subdir1/
+//             subdir2/
+//
+//     dir2/
+//             subdir1/
+//             subdir2/
+//             subdir3/
+//
+//
+// HINTS
+//
+//   ONLY READ THIS IF YOU GET STUCK
+//
+//   + Get all the files in a directory using ioutil.ReadDir
+//     (A directory is also a file)
+//
+//   + You can use IsDir method of a FileInfo value to detect
+//     whether a file is a directory or not: go doc os.FileInfo.IsDir
+//
+//   + You can use '\t' escape sequence for indenting the subdirs.
+//
+//   + You can find a sample directory structure under:
+//     solution/ directory
+//
+// ---------------------------------------------------------
+
+func main() {
+}

17-project-empty-file-finder/exercises/3-print-directories/solution/dir/.gitignore

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+*
+!subdir1
+!subdir2
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir/subdir1/.gitignore

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+*
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir/subdir2/.gitignore

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+*
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir2/.gitignore

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+*
+!subdir1
+!subdir2
+!subdir3
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir2/subdir1/.gitignore

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+*
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir2/subdir2/.gitignore

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+*
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dir2/subdir3/.gitignore

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+*
+!.gitignore

17-project-empty-file-finder/exercises/3-print-directories/solution/dirs.txt

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+dir/
+	subdir1/
+	subdir2/
+
+dir2/
+	subdir1/
+	subdir2/
+	subdir3/
+

17-project-empty-file-finder/exercises/3-print-directories/solution/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	paths := os.Args[1:]
+	if len(paths) == 0 {
+		fmt.Println("Please provide directory paths")
+		return
+	}
+
+	var dirs []byte
+
+	for _, dir := range paths {
+		files, err := ioutil.ReadDir(dir)
+		if err != nil {
+			fmt.Println(err)
+			return
+		}
+
+		dirs = append(dirs, dir...)
+		dirs = append(dirs, '\n')
+
+		for _, file := range files {
+			if file.IsDir() {
+				dirs = append(dirs, '\t')
+				dirs = append(dirs, file.Name()...)
+				dirs = append(dirs, '/', '\n')
+			}
+		}
+
+		dirs = append(dirs, '\n')
+	}
+
+	err := ioutil.WriteFile("dirs.txt", dirs, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+}

17-project-empty-file-finder/exercises/README.md

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+# File Append Exercises
+
+1. **[Sort and write items to a file](https://github.com/inancgumus/learngo/tree/master/15-slices/19-empty-file-finder-project/exercises/1-sort-to-a-file)**
+
+2. **[Sort and write items to a file with their ordinals](https://github.com/inancgumus/learngo/tree/master/15-slices/19-empty-file-finder-project/exercises/2-sort-to-a-file)**
+
+3. **[Find and write the names of subdirectories to a file](https://github.com/inancgumus/learngo/tree/master/15-slices/19-empty-file-finder-project/exercises/3-print-directories)**