Parser.py: use argparse

Use argparse for command line arguments. This gives us the online help and
will give use more flexibility to add command line options.

We preserve the current behaviour with up to two positional arguments for
the ekl and seq input files, and up to two arguments for the key:value
search.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>

Parser.py

@@ -3,6 +3,8 @@
 
 
 import sys
+import argparse
+
 
 #based loosley on https://stackoverflow.com/a/4391978
 # returns a filtered dict of dicts that meet some Key-value pair.
@@ -161,16 +163,31 @@ def dict_2_md(input_list,file):
 
 
 def main():
-    #Command line argument 1, ekl file to open, else open sample
-    log_file = sys.argv[1] if len(sys.argv) >= 2 else "sample.ekl"
+    parser = argparse.ArgumentParser(
+        description='Process SCT results.'
+                    ' This program takes the SCT summary and sequence files,'
+                    ' and generates a nice report in mardown format.',
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument(
+        '--md', help='Output .md filename', default='result.md')
+    parser.add_argument(
+        'log_file', nargs='?', default='sample.ekl',
+        help='Input .ekl filename')
+    parser.add_argument(
+        'seq_file', nargs='?', default='sample.seq',
+        help='Input .seq filename')
+    parser.add_argument('find_key', nargs='?', help='Search key')
+    parser.add_argument('find_value', nargs='?', help='Search value')
+    args = parser.parse_args()
+
+    #Command line argument 1, ekl file to open
     db1 = list() #"database 1" all tests.
-    with open(log_file,"r",encoding="utf-16") as f: #files are encoded in utf-16
+    with open(args.log_file,"r",encoding="utf-16") as f: #files are encoded in utf-16
         db1 = ekl_parser(f.readlines())
 
-    #Command line argument 2, seq file to open, else open sample
-    seq_file = sys.argv[2] if len(sys.argv) >= 3 else "sample.seq"
+    #Command line argument 2, seq file to open
     db2 = dict() #"database 2" all test sets that should run
-    with open(seq_file,"r",encoding="utf-16") as f: #files are encoded in utf-16
+    with open(args.seq_file,"r",encoding="utf-16") as f: #files are encoded in utf-16
         db2 = seq_parser(f)
 
     #cross check is filled only with tests labled as "run" int the seq file
@@ -191,9 +208,8 @@ def main():
     warnings = key_value_find(cross_check,"result","WARNING")
     passes = key_value_find(cross_check,"result","PASS")
 
-
     # generate MD summary
-    with open('result.md', 'w') as resultfile:
+    with open(args.md, 'w') as resultfile:
         resultfile.write("# SCT Summary \n\n")
         resultfile.write("|  |  |\n")
         resultfile.write("|--|--|\n")
@@ -218,13 +234,14 @@ def main():
 
     #command line argument 3&4, key are to support a key & value search.
     #these will be displayed in CLI
-    if len(sys.argv) >= 5:
-        find_key = sys.argv[3]
-        find_value = sys.argv[4]
-        found = key_value_find(db1,find_key,find_value)
+    if args.find_key is not None and args.find_value is not None:
+        found = key_value_find(db1, args.find_key, args.find_value)
         #print the dict
         print("found:",len(found),"items with search constraints")
         for x in found:
-            print(x["guid"],":",x["name"],"with",find_key,":",x[find_key])
+            print(
+                x["guid"], ":", x["name"], "with", args.find_key, ":",
+                x[args.find_key])
+
 
 main()

README.md

@@ -10,7 +10,9 @@ It will proceed to generate a Markdown file listing number of failures, passes,
 ## Usage
 Usage to generate a "result md" is such. `python3 parser.py <log_file.ekl> <seq_file.seq>`
 If you do no provided any command line arguments it will use `sample.ekl` and `sample.seq`.
+The output filename can be specified with `--md <filename>`.
 
+An online help is available with the `-h` option.
 
 ### Custom search
 For a custom Key:value search, the next two arguments *MUST be included together.* The program will search and display files that met that constraint, without the crosscheck, and display the names, guid, and key:value to the command line. `python3 Parser.py <file.ekl> <file.seq> <search key> <search value>`