naive sed

This project contains the propose solution to Week 1 assignment

The goal is to build a search command implementation

Requiriments

• Only the substitution command is required: ✅
• Create a command line utility that accepts options and arguments: ✅
• The first argument will be the command and the second one will be the file: ✅
• Check if the file specified exists: ✅
• Check if the substitution command is valid: ✅
• Implement the -n option, which prevents a line from being printed unless specified by ‘p’: ✅
• Implement the -i [extension] which tells sed to edit the file instead of printing to the standard output : ✅
• A copy of the original should be saved in [file_name].[extension]
• Multiple substitution commands should be accepted with the -e option, with one command per -e appearance : ✅
• When the -n option appears, the line should not be printed to the standard output unless specified: ✅
• The -f [script-file] option should expect a file which consists of several lines containing one command each: ✅
• Implement the p flag which tells that the line should be printed: ✅
• Implement the g flag which tells that all occurrences of the search should be replaced on the line. By default only the first occurrence is replaced : ✅

Remarks

-i [extension]

Requiriment: A copy of the original should be saved in [file_name].[extension] When -i is passed a new file Implementation: A new file with name [new-{file-name}].[extension] is created in the same directory, this file will contain the result of substitute commands passed, and the "original" file will be staying with its original data and name as required

Check if the file specified exists task

The implementation checks also for read, file visible to the calling process and write if specified.

Substitute command accepted sintaxis

The sintaxis for valid command input are:

1. The only separator character supported is: " /"
2. A command should not be wrapped in '[command]', it should be as follows: [command]
3. Regular expressions are not implemented in search field.

Substitute command accepted sintaxis

This implementations use files path with fs and path node core modules, so it works on any OS.

Usage

In order to run the sed project, run: node index.js { substitute command }

Command line should be in repo's root folder