[man,help] Add script to generate man, .h page. Use for `root`. (#2339)

* [man,help] Add script to generate man, .h page. Use for `root`.

* Script improvements

* fix path bug

* bug fix

build/misc/argparse2help.py

+import sys
+import importlib
+import os
+
+def getLongest():
+	longestSize = 0
+	for arg in listArgs:
+		if (len(arg.option_strings)==0):
+			size = len(arg.dest)
+		else:
+			size = len(", ".join(arg.option_strings))
+		longestSize = max(longestSize, size)
+	return longestSize
+	
+def write_header(parser, fileName):
+	longestSize = getLongest() 
+	file= open(fileName, "w+")
+	splitPath = sys.argv[2].split("/")
+	file.write("#ifndef ROOT_{}\n".format(splitPath[len(splitPath)-1].partition(".")[0]))
+	file.write("#define ROOT_{}\n".format(splitPath[len(splitPath)-1].partition(".")[0]))
+	file.write("constexpr static const char kCommandLineOptionsHelp[] = R\"RAW(\n")
+	file.write(parser.format_usage() + "\n")
+	file.write("OPTIONS:\n")
+	for arg in listArgs:
+		options = ""
+		help = arg.help 
+		if (len(arg.option_strings)==0):
+			listOptions = [arg.dest]
+		else:
+			listOptions = arg.option_strings
+		options = ", ".join(listOptions)
+		spaces = " " * (12 + longestSize - len(options))
+		help = help.replace("\n", "\n  {}".format(" "*(len(options)) + spaces))
+		file.write("  {}{}{}\n".format(options, spaces, help))
+	file.write(")RAW\";\n")
+	file.write("#endif\n")
+	file.close()
+	
+def write_man(parser, fileName):
+	file= open(fileName, "w+")
+	file.write(".TH {} 1 \n".format(parser.prog))
+	file.write(".SH SYNOPSIS\n")
+	file.write(parser.format_usage() + "\n")
+	file.write(".SH DESCRIPTION\n")
+	file.write(parser.description + "\n")
+	file.write(".SH OPTIONS\n")
+	for arg in listArgs:
+		options = ""
+		help = arg.help
+		if (len(arg.option_strings)==0):
+			listOptions = [arg.dest]
+		else:
+			listOptions = arg.option_strings
+		options = "\ ".join(listOptions)
+		file.write(".IP {}\n".format(options))
+		file.write(help.replace("\n","\n.IP\n")+ "\n")
+	file.close()
+
+if __name__ == "__main__":
+	path = os.path.expanduser(sys.argv[1])
+	splitPath = path.split("/")
+	sys.path.insert(0, "/".join(splitPath[:len(splitPath)-1]))
+	i = importlib.import_module(splitPath[len(splitPath)-1].partition(".")[0])
+	parser = i.get_argparse()
+	listArgs = parser._actions
+	if (sys.argv[2].partition(".")[2] == "h"):
+		write_header(parser, sys.argv[2])
+	elif (sys.argv[2].partition(".")[2] == "1"):
+		write_man(parser, sys.argv[2])
+		
\ No newline at end of file

core/base/src/root-argparse.py

+import argparse
+import sys
+
+def get_argparse():
+	parser = argparse.ArgumentParser(add_help=False, prog='root',
+	description = """ROOTs Object-Oriented Technologies.\n
+root is an interactive interpreter of C++ code. It uses the ROOT  framework.  For  more information on ROOT, please refer to\n
+An extensive Users Guide is available from that site (see below).
+""")
+	parser.add_argument('-b', help='Run in batch mode without graphics')
+	parser.add_argument('-x', help='Exit on exceptions')
+	parser.add_argument('-e', help='Execute the command passed between single quotes')
+	parser.add_argument('-n', help='Do not execute logon and logoff macros as specified in .rootrc')
+	parser.add_argument('-t', help='Enable thread-safety and implicit multi-threading (IMT)')
+	parser.add_argument('-q', help='Exit after processing command line macro files')
+	parser.add_argument('-l', help='Do not show splash screen')
+	parser.add_argument('-config', help='print ./configure options')
+	parser.add_argument('-memstat', help='run with memory usage monitoring')
+	parser.add_argument('-h','-?', '--help', help='Show summary of options')
+	parser.add_argument('--notebook', help='Execute ROOT notebook')
+	parser.add_argument('--web', help='Display graphics in a web browser')
+	parser.add_argument('dir', help='if dir is a valid directory cd to it before executing')
+	return parser