qapi-gen: New common driver for code and doc generators

Whenever qapi-schema.json changes, we run six programs eleven times to
update eleven files.  Similar for qga/qapi-schema.json.  This is
silly.  Replace the six programs by a single program that spits out
all eleven files.

The programs become modules in new Python package qapi, along with the
helper library.  This requires moving them to scripts/qapi/.  While
moving them, consistently drop executable mode bits.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180211093607.27351-9-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[eblake: move change to one-line 'blurb' earlier in series, mention mode
bit change as intentional, update qapi-code-gen.txt to match actual
generated events.c file]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 8 insertions, 21 deletions

diff --git a/scripts/qapi2texi.py b/scripts/qapi/doc.py
index 8a604d86a6..cc4d5a43fb 100755..100644
--- a/scripts/qapi2texi.py
+++ b/scripts/qapi/doc.py
@@ -4,11 +4,10 @@
 # This work is licensed under the terms of the GNU LGPL, version 2+.
 # See the COPYING file in the top-level directory.
 """This script produces the documentation of a qapi schema in texinfo format"""
+
 from __future__ import print_function
 import re
-import sys
-
-import qapi
+import qapi.common
 
 MSG_FMT = """
 @deftypefn {type} {{}} {name}
@@ -197,7 +196,7 @@ def texi_entity(doc, what, base=None, variants=None,
             + texi_sections(doc))
 
 
-class QAPISchemaGenDocVisitor(qapi.QAPISchemaVisitor):
+class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
     def __init__(self):
         self.out = None
         self.cur_doc = None
@@ -272,20 +271,8 @@ def texi_schema(schema):
     return gen.out
 
 
-def main(argv):
-    """Takes schema argument, prints result to stdout"""
-    if len(argv) != 2:
-        print("%s: need exactly 1 argument: SCHEMA" % argv[0], file=sys.stderr)
-        sys.exit(1)
-
-    schema = qapi.QAPISchema(argv[1])
-    if not qapi.doc_required:
-        print("%s: need pragma 'doc-required' "
-               "to generate documentation" % argv[0], file=sys.stderr)
-        sys.exit(1)
-    print('@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n')
-    print(texi_schema(schema), end='')
-
-
-if __name__ == '__main__':
-    main(sys.argv)
+def gen_doc(schema, output_dir, prefix):
+    if qapi.common.doc_required:
+        gen = qapi.common.QAPIGenDoc()
+        gen.add(texi_schema(schema))
+        gen.write(output_dir, prefix + 'qapi-doc.texi')