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lsimple

Goal

Implement a simple ls-like command.

Learning

  • OS basic structure
  • Recursion
  • SOLID
  • Standart library in one language
  • Tests and TDD

Implementation

This implementation os ls, must have this features:

  • If the folder is empty, a blank line must be printed.
  • If there are files on folder, they must be printed in alphabetic order, as follows:
$ lsimple
file1
file2
file3
  • If there are folders on folder, they must be printed in alphabetic order and with slashes in the and of the name, as can be seen below.
$ lsimple
dir1/
dir2/
dir3/
  • If both, files and folders, exist, they must be printed with folders on top of files. Within files, they must sorted alphabetically. Same for folders. A sample can be seen below.
$ lsimple
dir1/
dir2/
dir3/
file1
file2
file3
  • If a flag --recursive is passed to the lsimple, files and folders must be printed recursivelly, with two spaces in front of the files every time it enters a folder. A sample can be seen bellow.
$ lsimple --recursive
dir1/
  subdir1/
  subdir2/
    subdir1/
    subfile1
  subfile1
  subfile2
dir2/
  subdir1/
  subfile1
dir3/
file1
file2
file3

  • If a flag --format=spaces is passed to the lsimple, the files/foldersmust be printed with the default format, using spaces.

  • If a flag --format=tree is passed to the lsimple, the files/folders must be printed following tree command format. A sampla can be seen bellow.

lsimple --format=tree
.
├── dir1
├── dir2
├── dir3
├── file1
├── file2
└── file3
  • Format flags (--format[spaces,tree]) and --recursive flag can be combined. A sample can be seen below.
lsimple --format=tree --recursive
.
├── dir1
│   ├── subdir1
│   ├── subdir2
│   │   ├── subdir1
│   │   └── subfile1
│   ├── subfile1
│   └── subfile2
├── dir2
│   ├── subdir1
│   └── subfile1
├── dir3
├── file1
├── file2
└── file3

$ lsimple --format=spaces --recursive
dir1/
  subdir1/
  subdir2/
    subdir1/
    subfile1
  subfile1
  subfile2
dir2/
  subdir1/
  subfile1
dir3/
file1
file2
file3

Problem extensions

If the mentee solves the problem quickly/easily additional features can be added, like:

  • Append * to files/folder with execution permission.
  • Add new format, e.g. Json, XML.