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#!/usr/bin/env python3

# sys: for reading command-line arguments.

# rich: for coloring the text.

import sys

from rich import print

# Print Usage message if enough arguments are not passed.

if len(sys.argv) < 3:

print("Usage:")

print("\tMust provide two file names as command-line arguments.")

print("\tdiff.py <orignal_file> <changed_file>")

exit(1)

orignal = sys.argv[1]

changed = sys.argv[2]

# Read the contents of the files in lists.

orignal_contents = open(orignal, "r").readlines()

changed_contents = open(changed, "r").readlines()

color = "green"

symbol = f"[bold {color}][+]"

print()

# Determine which file has changed much.

if len(changed_contents) <= len(orignal_contents):

color = "red"

symbol = f"[bold {color}][-]"

smallest_sloc, largest_sloc = changed_contents, orignal_contents

else:

smallest_sloc, largest_sloc = orignal_contents, changed_contents

# Go over all the lines to check the changes.

for line in range(0, len(smallest_sloc)):

if orignal_contents[line] == changed_contents[line]:

# Ignore if the lines are same.

continue

else:

# Display the changes on the respective lines of the files.

print(f"[bold red][-] Line {line + 1}:[/bold red] {orignal_contents[line]}", end = "")

print(f"[bold green][+] Line {line + 1}:[/bold green] {changed_contents[line]}")

# Show the additions [+] or deletions [-] for the file that is the largest.

if line == len(smallest_sloc) - 1:

for new_line in range(line + 1, len(largest_sloc)):

print(f"{symbol} Line {new_line + 1}:[/bold {color}] {largest_sloc[new_line]}")