added a python diff util (modified)

KILLinefficiency · KILLinefficiency · commit 8ecb81219bb3 · 2021-10-03T00:17:12.000+05:30
diff --git a/projects/Diff_Util/README.md b/projects/Diff_Util/README.md
@@ -0,0 +1,55 @@
+# Diff Utility
+
+This program is a minimal clone of the UNIX ``diff`` program.
+
+``diff.py`` takes two file names as command-line arguments and compares them for changes.
+
+## Dependencies:
+* Rich: ``rich==10.11.0``
+
+## Running on Windows:
+
+```
+python diff.py <orignal_file> <changed_file>
+```
+
+## Running on Linux / macOS:
+
+```
+./diff.py <orignal_file> <changed_file>
+```
+
+## Example:
+
+Consider two files ``v1`` and ``v2``:
+
+**v1**:
+```
+Bruce
+Alfred
+Jason
+```
+
+**v2**:
+```
+Batman
+Alfred
+Red Hood
+Joker
+Ra's Al Ghul
+```
+
+On running ``./diff.py v1 v2``, you'll get the following output:
+```
+
+[-] Line 1: Bruce
+[+] Line 1: Batman
+
+[-] Line 3: Jason
+[+] Line 3: Red Hood
+
+[+] Line 4: Joker
+
+[+] Line 5: Ra's Al Ghul
+
+```
diff --git a/projects/Diff_Util/diff.py b/projects/Diff_Util/diff.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+
+import sys
+from rich import print
+
+if len(sys.argv) < 3:
+    print("Error")
+    exit(1)
+
+orignal = sys.argv[1]
+changed = sys.argv[2]
+
+orignal_contents = open(orignal, "r").readlines()
+changed_contents = open(changed, "r").readlines()
+
+color = "green"
+symbol = f"[bold {color}][+]"
+
+print()
+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
+
+for line in range(0, len(smallest_sloc)):
+    if orignal_contents[line] == changed_contents[line]:
+        continue
+    else:
+        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]}")
+        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]}")
