added argument parsing

1 files changed, 88 insertions, 1 deletions

diff --git a/src/xi.py b/src/xi.py
index 8240fc1..0711f0a 100644
--- a/src/xi.py
+++ b/src/xi.py
@@ -1 +1,88 @@
-print("xixixixixi")
+import sys
+
+options = {
+        "y" : {
+                "name" : "no-confirm",
+                "flag" : True,
+                "desc": "will not prompt the user"
+            },
+        "r" : {
+                "name" : "root",
+                "flag" : False,
+                "desc" : "specify the directory to use as the system root",
+                "default" : "/"
+            },
+        "h": {
+                "name": "help",
+                "flag" : True,
+                "desc" : "prints the command usage and exists the program",
+            }
+        }
+
+def parse_args():
+
+    # re-organise the options by name rather than by single letter
+    # a dict with "name": option_leter
+    names = { v["name"] if v["name"] else k : k for k,v in options.items()}
+
+    args = sys.argv
+    index = 1
+
+    # save all of the options into a "parsed" dictionary
+    parsed = {"other" : []}
+
+    while index < len(args):
+        arg = args[index]
+
+        if len(arg) > 1 and arg[0] == "-":
+            option = None
+
+            # is a named argument with a --
+            if arg[1] == "-" and len(arg) > 2 and arg[2:].split("=")[0] in names:
+                option = names[arg[2:].split("=")[0]]
+            # is a single letter argument with a -
+            elif arg[1] in options:
+                option = arg[1]
+            else:
+                parsed["other"].append(arg)
+
+            # add the option and any values ot the parsed dict
+            if option is not None:
+                if options[option]["flag"]:
+                    parsed[option] = True
+                else:
+                    if "=" in arg:
+                        parsed[option] = arg.split("=")[1]
+                    else:
+                        index += 1
+                        parsed[option] = args[index]
+        else:
+            parsed["other"].append(arg)
+    
+
+        index += 1
+
+    # add all default values to the parsed options
+    for option in options:
+        if not option in parsed:
+            if options[option]["flag"]:
+                parsed[option] = False
+            else:
+                parsed[option] = options[option]["default"]
+
+    return parsed
+
+def print_usage():
+    for option,o in options.items():
+        name = o["name"]
+        description = o["desc"]
+        d = ("[default=" + o["default"] + "]") if not o["flag"] else ""
+
+        print(f"\t-{option}, --{name}\t{d}")
+        print(f"\t\t{description}\n")
+
+
+opts = parse_args()
+if opts["h"]:
+    print_usage()
+