GoGrep, a golang grep-like clone

Building GoGrep

• Dev: Run sh dev.sh
  1. Builds project to exe (on Windows) in build folder
  2. Runs executable with some test arguments
• Prod: Run sh prod.sh
  1. Builds project to exe (on Windows) in build folder

Running GoGrep

• Add Environment Variable to gogrep build folder (or move exe/binary to appropriate folder)
• gogrep [OPTIONS] PATTERN [FILE/DIRECTORY]
• Options
  • -r : read all files under each directory recursively

Pipeline/Architecture

1. Start gogrep, pass in parameters:
   1. target string/regex
   2. root directory (implicit or explicit)
   3. ignores
2. Recursively read contents of root directory
   1. If item is a directory:
      1. Append name to current root
      2. Recurse search function with new root directory in a new goroutine
   2. If item is a file:
      1. Read contents line by line and search/match with target string/regex
      2. Output a match
3. Matching data to target
   1. Good old fashion, line by line reading and matching string
   2. Using Boyer-Moore algorithm (same one used by GNU grep)
   3. For regexes, using Go's built-in methods (since they're quite fast)

Current Support

• GoGrep with Boyer-Moore can only handle ASCII characters (need to deal with "weird" files like .exe, .db, etc.)
• Only looks for string patterns (no regex yet)

Why GoGrep?

1. I was bored
2. Learned Go last Sunday, wanted to test my knowledge out