#!/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 ' __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) id='n37' href='#n37'>37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169