Greplite

greplite is a simplified version of the grep command written in Rust. It allows you to search for a pattern within files, with support for case-insensitive searching and line numbers. This is my modified version of the minigrep implementation in the Rust Book.

Features

• Pattern Search: Search for a pattern (string or regex) within files.
• Case-Insensitive Search: Use the -i option for case-insensitive searching.
• Line Numbers: Use the -n option to display line numbers alongside matching lines.
• Regular Expression Support: Use the -r option to treat the pattern as a regular expression.
• Recursive Search: Use the -R option to search files in subdirectories.
• Highlight Matching Text: Use the -c option to highlight matching text in the output.
• Help: Use the -h option to display help and usage information.
• Pipe Support: Pass input through pipes from other commands, allowing you to use greplite in conjunction with other Unix-like tools.

Example usage

1. Basic Search

Search for the pattern "rust" in a file:

greplite "rust" file.txt

2. Case-insensitive Search

Perform a case-insensitive search using the -i option:

greplite -i "rust" file.txt

3. Search with Line Numbers

Show line numbers of the matching lines using the -n option:

greplite -n "error" log.txt

4. Search Across Multiple Files

Search in multiple files:

greplite "hello" file1.txt file2.txt

5. Search Using Regular Expressions

greplite supports regular expressions with the -r option. For example, to search for lines starting with "Rust" (case-sensitive), you can use:

greplite -r "^Rust" file.txt

To make the regex search case-insensitive, use both -r and -i:

greplite -r -i "^rust" file.txt

6. Recursive Search in Directories

Use the -R option to search recursively through all files in the specified directory and its subdirectories.

greplite -R "pattern" ./my_directory

7. Piping Output into greplite

greplite can also be used in combination with commands like cat, echo, or even complex command pipelines. For instance, if you want to search for a specific string in a file after filtering the contents with grep, you can chain the commands like this:

cat file.txt | greplite "pattern"

Using greplite in a Pipeline with Other Filters:

cat large_log.txt | greplite -i "error" | sort | uniq

8. Display Help

To see the available options and usage instructions, run the command with the -h option:

greplite -h