qapi: Factor parse_command_line() out of the generators

Backports commit 2114f5a98d0d80774306279e1694de074ca86aa0 from qemu

qemu/scripts/qapi-event.py

@@ -11,9 +11,7 @@
 
 from ordereddict import OrderedDict
 from qapi import *
-import sys
 import os
-import getopt
 import errno
 
 def _generate_event_api_name(event_name, params):
@@ -219,38 +217,10 @@ const char *%(event_enum_name)s_lookup[] = {
 
 # Start the real job
 
-try:
-    opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:i:o:",
-                                   ["source", "header", "prefix=",
-                                    "input-file=", "output-dir="])
-except getopt.GetoptError, err:
-    print str(err)
-    sys.exit(1)
-
-input_file = ""
-output_dir = ""
-prefix = ""
 c_file = 'qapi-event.c'
 h_file = 'qapi-event.h'
 
-do_c = False
+(input_file, output_dir, do_c, do_h, prefix, dummy) = parse_command_line()
-do_h = False
-
-for o, a in opts:
-    if o in ("-p", "--prefix"):
-        prefix = a
-    elif o in ("-i", "--input-file"):
-        input_file = a
-    elif o in ("-o", "--output-dir"):
-        output_dir = a + "/"
-    elif o in ("-c", "--source"):
-        do_c = True
-    elif o in ("-h", "--header"):
-        do_h = True
-
-if not do_c and not do_h:
-    do_c = True
-    do_h = True
 
 c_file = output_dir + prefix + c_file
 h_file = output_dir + prefix + h_file

qemu/scripts/qapi-types.py

@@ -11,9 +11,7 @@
 
 from ordereddict import OrderedDict
 from qapi import *
-import sys
 import os
-import getopt
 import errno
 
 def generate_fwd_struct(name, members, builtin_type=False):
@@ -265,42 +263,17 @@ void qapi_free_%(name)s(%(c_type)s obj)
                 c_type=c_type(name), name=c_name(name))
     return ret
 
-
-try:
-    opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:i:o:",
-                                   ["source", "header", "builtins",
-                                    "prefix=", "input-file=", "output-dir="])
-except getopt.GetoptError, err:
-    print str(err)
-    sys.exit(1)
-
-output_dir = ""
-input_file = ""
-prefix = ""
 c_file = 'qapi-types.c'
 h_file = 'qapi-types.h'
 
-do_c = False
-do_h = False
 do_builtins = False
 
-for o, a in opts:
+(input_file, output_dir, do_c, do_h, prefix, opts) = \
-    if o in ("-p", "--prefix"):
+    parse_command_line("b", ["builtins"])
-        prefix = a
-    elif o in ("-i", "--input-file"):
-        input_file = a
-    elif o in ("-o", "--output-dir"):
-        output_dir = a + "/"
-    elif o in ("-c", "--source"):
-        do_c = True
-    elif o in ("-h", "--header"):
-        do_h = True
-    elif o in ("-b", "--builtins"):
-        do_builtins = True
 
-if not do_c and not do_h:
+for o, a in opts:
-    do_c = True
+    if o in ("-b", "--builtins"):
-    do_h = True
+        do_builtins = True
 
 c_file = output_dir + prefix + c_file
 h_file = output_dir + prefix + h_file

qemu/scripts/qapi-visit.py

@@ -15,9 +15,7 @@
 from ordereddict import OrderedDict
 from qapi import *
 import re
-import sys
 import os
-import getopt
 import errno
 
 implicit_structs = []
@@ -378,41 +376,17 @@ void visit_type_%(name)s(Visitor *m, %(name)s *obj, const char *name, Error **er
 ''',
                  name=c_name(name))
 
-try:
-    opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:i:o:",
-                                   ["source", "header", "builtins", "prefix=",
-                                    "input-file=", "output-dir="])
-except getopt.GetoptError, err:
-    print str(err)
-    sys.exit(1)
-
-input_file = ""
-output_dir = ""
-prefix = ""
 c_file = 'qapi-visit.c'
 h_file = 'qapi-visit.h'
 
-do_c = False
-do_h = False
 do_builtins = False
 
-for o, a in opts:
+(input_file, output_dir, do_c, do_h, prefix, opts) = \
-    if o in ("-p", "--prefix"):
+    parse_command_line("b", ["builtins"])
-        prefix = a
-    elif o in ("-i", "--input-file"):
-        input_file = a
-    elif o in ("-o", "--output-dir"):
-        output_dir = a + "/"
-    elif o in ("-c", "--source"):
-        do_c = True
-    elif o in ("-h", "--header"):
-        do_h = True
-    elif o in ("-b", "--builtins"):
-        do_builtins = True
 
-if not do_c and not do_h:
+for o, a in opts:
-    do_c = True
+    if o in ("-b", "--builtins"):
-    do_h = True
+        do_builtins = True
 
 c_file = output_dir + prefix + c_file
 h_file = output_dir + prefix + h_file

qemu/scripts/qapi.py

@@ -13,6 +13,7 @@
 
 import re
 from ordereddict import OrderedDict
+import getopt
 import os
 import sys
 import string
@@ -977,3 +978,42 @@ def guardend(name):
 
 ''',
                  name=guardname(name))
+
+def parse_command_line(extra_options = "", extra_long_options = []):
+
+    try:
+        opts, args = getopt.gnu_getopt(sys.argv[1:],
+                                       "chp:i:o:" + extra_options,
+                                       ["source", "header", "prefix=",
+                                        "input-file=", "output-dir="]
+                                       + extra_long_options)
+    except getopt.GetoptError, err:
+        print str(err)
+        sys.exit(1)
+
+    output_dir = ""
+    prefix = ""
+    do_c = False
+    do_h = False
+    extra_opts = []
+
+    for oa in opts:
+        o, a = oa
+        if o in ("-p", "--prefix"):
+            prefix = a
+        elif o in ("-i", "--input-file"):
+            input_file = a
+        elif o in ("-o", "--output-dir"):
+            output_dir = a + "/"
+        elif o in ("-c", "--source"):
+            do_c = True
+        elif o in ("-h", "--header"):
+            do_h = True
+        else:
+            extra_opts.append(oa)
+
+    if not do_c and not do_h:
+        do_c = True
+        do_h = True
+
+    return (input_file, output_dir, do_c, do_h, prefix, extra_opts)