Ejercicio 7

exercises/ex07/ex07.py

@@ -0,0 +1,59 @@
+# Exercise 2
+# 1. grep command
+
+import re
+import sys
+import argparse
+from pathlib import Path
+
+
+def loop(args):
+    stderr = False
+    for path in args["paths"]:
+        if not path.exists():
+            print(f"grep: {path}: No existe el fichero o el directorio")
+            stderr = True
+        elif path.is_dir():
+            print(f"grep: {path}: Es un directorio")
+            stderr = True
+        else:
+            grep(path, args)
+    return stderr
+
+
+def grep(path, args):
+    lines = open(path, "r").readlines()
+    res = []
+    pre = ""
+    if len(args["paths"]) > 1:
+        pre = f"{path}:"
+    for line in lines:
+        tmp = line[:]
+        if args["ignore_case"]:
+            tmp = tmp.lower()
+        if args["extended_regexp"]:
+            res = re.compile(args["extended_regexp"]).search(tmp)
+        else:
+            res = tmp.find(args["query"])
+        if res is not None and res != -1:
+            print(f"{pre}{line}", end="")
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument('paths', nargs="+", type=Path)
+parser.add_argument('-i', '--ignore-case', default=False, action="store_true")
+parser.add_argument('-E', '--extended-regexp', default=False, type=str)
+
+if len(sys.argv) > 1:
+    if sys.argv[1] != "-E" and sys.argv[1] != "-i":
+        query = str(sys.argv[1])
+        del sys.argv[1]
+    else:
+        query = False
+    args = parser.parse_args().__dict__
+    args["query"] = query
+    stderr = loop(args)
+    if stderr:
+        sys.exit(1)
+else:
+    sys.exit(1)