EGG is a Even Greater Grep command line application. This project serves as a template for the first homework assignment. To learn more about the homework assignments in general, visit the homework repository.
Throughout this homework assignment you will create a clone of the grep command line tool.
The basic syntax is as follows:
egg pattern [FILES]
where pattern represents a regular expression as supported by the regexp package and files represents a path or list of paths to a single or multiple files. If no files are provided, the grep will instead read data from the standard input.
The example usage is as follows:
egg '\[[0-9]+\]' ./my/cool/file.txt /etc/random/config.txt
The application will then read all the specified files and searches for lines that match the regural expression. For each line that matches, the application will print the matched line together with the line number.
The sample output:
File: ./my/cool/file.txt
12: coming up with examples is hard [12]. It is not expected
25: “The computer was born to solve problems that did not exist before.” [23]
When an invalid input is provided to the application or the application fails, it must print an error message to the standard error output and exit with non-zero status code.
The CLI application has to support all the functionality previously described. Stress is also given on writting idiomatic code and properly handling resources and errors.
The main goal of this homework is to practice basic control flow, error handling and interaction with several Go packages and their documentations.
Some of the Go packages worth looking into include: