qapi: Turn generators' mandatory option -i into an argument

Mandatory option is silly, and the error handling is missing: the
programs crash when -i isn't supplied.  Make it an argument, and check
it properly.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

Makefile

@@ -243,17 +243,17 @@ qapi-py = $(SRC_PATH)/scripts/qapi.py $(SRC_PATH)/scripts/ordereddict.py
 qga/qapi-generated/qga-qapi-types.c qga/qapi-generated/qga-qapi-types.h :\
 $(SRC_PATH)/qga/qapi-schema.json $(SRC_PATH)/scripts/qapi-types.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py \
-		$(gen-out-type) -o qga/qapi-generated -p "qga-" -i $<, \
+		$(gen-out-type) -o qga/qapi-generated -p "qga-" $<, \
 		"  GEN   $@")
 qga/qapi-generated/qga-qapi-visit.c qga/qapi-generated/qga-qapi-visit.h :\
 $(SRC_PATH)/qga/qapi-schema.json $(SRC_PATH)/scripts/qapi-visit.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py \
-		$(gen-out-type) -o qga/qapi-generated -p "qga-" -i $<, \
+		$(gen-out-type) -o qga/qapi-generated -p "qga-" $<, \
 		"  GEN   $@")
 qga/qapi-generated/qga-qmp-commands.h qga/qapi-generated/qga-qmp-marshal.c :\
 $(SRC_PATH)/qga/qapi-schema.json $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
-		$(gen-out-type) -o qga/qapi-generated -p "qga-" -i $<, \
+		$(gen-out-type) -o qga/qapi-generated -p "qga-" $<, \
 		"  GEN   $@")
 
 qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
@@ -263,22 +263,22 @@ qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
 qapi-types.c qapi-types.h :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-types.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py \
-		$(gen-out-type) -o "." -b -i $<, \
+		$(gen-out-type) -o "." -b $<, \
 		"  GEN   $@")
 qapi-visit.c qapi-visit.h :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-visit.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py \
-		$(gen-out-type) -o "." -b -i $<, \
+		$(gen-out-type) -o "." -b $<, \
 		"  GEN   $@")
 qapi-event.c qapi-event.h :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-event.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-event.py \
-		$(gen-out-type) -o "." -i $<, \
+		$(gen-out-type) -o "." $<, \
 		"  GEN   $@")
 qmp-commands.h qmp-marshal.c :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
-		$(gen-out-type) -o "." -m -i $<, \
+		$(gen-out-type) -o "." -m $<, \
 		"  GEN   $@")
 
 QGALIB_GEN=$(addprefix qga/qapi-generated/, qga-qapi-types.h qga-qapi-visit.h qga-qmp-commands.h)

docs/qapi-code-gen.txt

@@ -536,7 +536,7 @@ created code.
 Example:
 
     $ python scripts/qapi-types.py --output-dir="qapi-generated" \
-    --prefix="example-" --input-file=example-schema.json
+    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qapi-types.c
 [Uninteresting stuff omitted...]
 
@@ -623,7 +623,7 @@ $(prefix)qapi-visit.h: declarations for previously mentioned visitor
 Example:
 
     $ python scripts/qapi-visit.py --output-dir="qapi-generated"
-    --prefix="example-" --input-file=example-schema.json
+    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qapi-visit.c
 [Uninteresting stuff omitted...]
 
@@ -681,7 +681,7 @@ Example:
         error_propagate(errp, err);
     }
     $ python scripts/qapi-commands.py --output-dir="qapi-generated" \
-    --prefix="example-" --input-file=example-schema.json
+    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qapi-visit.h
 [Uninteresting stuff omitted...]
 
@@ -715,7 +715,7 @@ $(prefix)qmp-commands.h: Function prototypes for the QMP commands
 Example:
 
     $ python scripts/qapi-commands.py --output-dir="qapi-generated"
-    --prefix="example-" --input-file=example-schema.json
+    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qmp-marshal.c
 [Uninteresting stuff omitted...]
 
@@ -806,7 +806,7 @@ $(prefix)qapi-event.c - Implementation of functions to send an event
 Example:
 
     $ python scripts/qapi-event.py --output-dir="qapi-generated"
-    --prefix="example-" --input-file=example-schema.json
+    --prefix="example-" example-schema.json
     $ cat qapi-generated/example-qapi-event.c
 [Uninteresting stuff omitted...]
 

scripts/qapi.py

@@ -984,10 +984,9 @@ def parse_command_line(extra_options = "", extra_long_options = []):
 
     try:
         opts, args = getopt.gnu_getopt(sys.argv[1:],
-                                       "chp:i:o:" + extra_options,
+                                       "chp:o:" + extra_options,
                                        ["source", "header", "prefix=",
-                                        "input-file=", "output-dir="]
-                                       + extra_long_options)
+                                        "output-dir="] + extra_long_options)
     except getopt.GetoptError, err:
         print >>sys.stderr, "%s: %s" % (sys.argv[0], str(err))
         sys.exit(1)
@@ -1002,8 +1001,6 @@ def parse_command_line(extra_options = "", extra_long_options = []):
         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"):
@@ -1017,8 +1014,9 @@ def parse_command_line(extra_options = "", extra_long_options = []):
         do_c = True
         do_h = True
 
-    if len(args) != 0:
-        print >>sys.stderr, "%s: too many arguments" % sys.argv[0]
+    if len(args) != 1:
+        print >>sys.stderr, "%s: need exactly one argument" % sys.argv[0]
         sys.exit(1)
+    input_file = args[0]
 
     return (input_file, output_dir, do_c, do_h, prefix, extra_opts)

tests/Makefile

@@ -303,22 +303,22 @@ tests/test-vmstate$(EXESUF): tests/test-vmstate.o \
 tests/test-qapi-types.c tests/test-qapi-types.h :\
 $(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-types.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-types.py \
-		$(gen-out-type) -o tests -p "test-" -i $<, \
+		$(gen-out-type) -o tests -p "test-" $<, \
 		"  GEN   $@")
 tests/test-qapi-visit.c tests/test-qapi-visit.h :\
 $(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-visit.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-visit.py \
-		$(gen-out-type) -o tests -p "test-" -i $<, \
+		$(gen-out-type) -o tests -p "test-" $<, \
 		"  GEN   $@")
 tests/test-qmp-commands.h tests/test-qmp-marshal.c :\
 $(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
-		$(gen-out-type) -o tests -p "test-" -i $<, \
+		$(gen-out-type) -o tests -p "test-" $<, \
 		"  GEN   $@")
 tests/test-qapi-event.c tests/test-qapi-event.h :\
 $(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json $(SRC_PATH)/scripts/qapi-event.py $(qapi-py)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-event.py \
-		$(gen-out-type) -o tests -p "test-" -i $<, \
+		$(gen-out-type) -o tests -p "test-" $<, \
 		"  GEN   $@")
 
 tests/test-string-output-visitor$(EXESUF): tests/test-string-output-visitor.o $(test-qapi-obj-y) libqemuutil.a libqemustub.a