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-rwxr-xr-xlv2includegen/lv2includegen.py118
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-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-
-"""A program (and Python module) to generate a tree of symlinks to LV2
-extension bundles, where the path of the symlink corresponds to the URI of
-the extension. This allows including extension headers in code without using
-the bundle name. Including extension headers in this way is much better,
-since there is no dependency on the (meaningless and non-persistent) bundle
-name in the code using the header.
-
-For example, after running lv2includegen (and setting the compiler include
-path appropriately), LV2 headers could be included like so:
-
-#include "lv2/lv2plug.in/ns/lv2core/lv2.h"
-#include "lv2/lv2plug.in/ns/ext/event/event.h"
-#include "lv2/example.org/foo/foo.h"
-
-Where the initial "lv2" is arbitrary; in this case lv2includegen's output
-directory was "lv2", and that directory's parent was added to the compiler
-include search path. It is a good idea to use such a prefix directory so
-domain names do not conflict with anything else in the include path.
-"""
-
-__authors__ = 'David Robillard'
-__license = 'GNU GPL v3 or later <http://www.gnu.org/licenses/gpl.html>'
-__contact__ = 'devel@lists.lv2plug.in'
-__date__ = '2010-10-05'
-
-import errno
-import glob
-import os
-import stat
-import sys
-
-import RDF
-
-rdf = RDF.NS('http://www.w3.org/1999/02/22-rdf-syntax-ns#')
-lv2 = RDF.NS('http://lv2plug.in/ns/lv2core#')
-
-def lv2_path():
- "Return the LV2 search path (LV2_PATH in the environment, or a default)."
- if 'LV2_PATH' in os.environ:
- return os.environ['LV2_PATH']
- else:
- ret = '/usr/lib/lv2' + os.pathsep + '/usr/local/lib/lv2'
- print 'LV2_PATH unset, using default ' + ret
- return ret
-
-def __bundles(search_path):
- "Return a list of all LV2 bundles found in search_path."
- dirs = search_path.split(os.pathsep)
- bundles = []
- for dir in dirs:
- bundles += glob.glob(os.path.join(dir, '*.lv2'))
- return bundles
-
-def __usage():
- script = os.path.basename(sys.argv[0])
- print """Usage:
- %s OUTDIR
-
- OUTDIR : Directory to build include tree
-
-Example:
- %s /usr/local/include/lv2
-""" % (script, script)
-
-def __mkdir_p(path):
- "Equivalent of UNIX mkdir -p"
- try:
- os.makedirs(path)
- except OSError as e:
- if e.errno == errno.EEXIST:
- pass
- else:
- raise
-
-def build_tree(search_path, outdir):
- """Build a directory tree under outdir containing symlinks to all LV2
- extensions found in search_path, such that the symlink paths correspond to
- the extension URIs."""
- for bundle in __bundles(search_path):
- # Load manifest into model
- manifest = RDF.Model()
- parser = RDF.Parser(name="guess")
- parser.parse_into_model(manifest, 'file://' + os.path.join(bundle, 'manifest.ttl'))
-
- # Query extension URI
- results = manifest.find_statements(RDF.Statement(None, rdf.type, lv2.Specification))
- for r in results:
- ext_uri = str(r.subject.uri)
- ext_path = os.path.normpath(ext_uri[ext_uri.find(':') + 1:].lstrip('/'))
- ext_dir = os.path.join(outdir, ext_path)
-
- # Make parent directories
- __mkdir_p(os.path.dirname(ext_dir))
-
- # Remove existing symlink if necessary
- if os.access(ext_dir, os.F_OK):
- mode = os.lstat(ext_dir)[stat.ST_MODE]
- if stat.S_ISLNK(mode):
- os.remove(ext_dir)
- else:
- raise Exception(ext_dir + " exists and is not a link")
-
- # Make symlink to bundle directory
- os.symlink(bundle, ext_dir)
-
-if __name__ == "__main__":
- args = sys.argv[1:]
- if len(args) != 1:
- usage()
- sys.exit(1)
-
- outdir = args[0]
- print "Building LV2 include tree at", outdir
-
- build_tree(lv2_path(), outdir)