actionsapi: Add new pkgconfig module

This module interacts with the pkgconfig tool and provides:

getVariableForLibrary(library, variable)
getLibraryVersion(library)
getLibraryCFLAGS(library)
getLibraryLIBADD(library)
runManualCommand(*args)
libraryExists(library)

pisi/actionsapi/pkgconfig.py

@@ -0,0 +1,138 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2011 TUBITAK/UEKAE
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option)
+# any later version.
+#
+# Please read the COPYING file.
+
+# Standart Python Modules
+import subprocess
+
+import gettext
+__trans = gettext.translation('pisi', fallback=True)
+_ = __trans.ugettext
+
+# PiSi Modules
+import pisi.context as ctx
+import pisi.actionsapi
+
+class PkgconfigError(pisi.actionsapi.Error):
+    def __init__(self, value=''):
+        pisi.actionsapi.Error.__init__(self, value)
+        self.value = value
+        ctx.ui.error(value)
+
+def getVariableForLibrary(library, variable):
+    # Returns a specific variable provided in the library .pc file
+    try:
+        proc = subprocess.Popen(["pkg-config",
+                                 "--variable=%s" % variable,
+                                 "%s" % library],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        return_code = proc.wait()
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        if return_code == 0 and proc.stdout:
+            return proc.stdout.read().strip()
+        else:
+            # Command failed
+            raise PkgconfigError(proc.stderr.read().strip())
+
+def getLibraryVersion(library):
+    """Returns the module version provided in the library .pc file."""
+    try:
+        proc = subprocess.Popen(["pkg-config",
+                                 "--modversion",
+                                 library],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        return_code = proc.wait()
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        if return_code == 0 and proc.stdout:
+            return proc.stdout.read().strip()
+        else:
+            # Command failed
+            raise PkgconfigError(proc.stderr.read().strip())
+
+def getLibraryCFLAGS(library):
+    """Returns compiler flags for compiling with this library.
+    Ex: -I/usr/include/nss"""
+    try:
+        proc = subprocess.Popen(["pkg-config",
+                                 "--cflags",
+                                 "%s" % library],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        return_code = proc.wait()
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        if return_code == 0 and proc.stdout:
+            return proc.stdout.read().strip()
+        else:
+            # Command failed
+            raise PkgconfigError(proc.stderr.read().strip())
+
+def getLibraryLIBADD(library):
+    """Returns linker flags for linking with this library.
+    Ex: -lpng14"""
+    try:
+        proc = subprocess.Popen(["pkg-config",
+                                 "--libs",
+                                 "%s" % library],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+        return_code = proc.wait()
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        if return_code == 0 and proc.stdout:
+            return proc.stdout.read().strip()
+        else:
+            # Command failed
+            raise PkgconfigError(proc.stderr.read().strip())
+
+def runManualCommand(*args):
+    """Runs the given command and returns the output."""
+    cmd = ["pkg-config"]
+    cmd.extend(args)
+    try:
+        proc = subprocess.Popen(cmd,
+                                stdout=subprocess.PIPE,
+                                stderr=subprocess.PIPE)
+        return_code = proc.wait()
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        if return_code == 0 and proc.stdout:
+            return proc.stdout.read().strip()
+        else:
+            # Command failed
+            raise PkgconfigError(proc.stderr.read().strip())
+
+
+def libraryExists(library):
+    """Returns True if the library provides a .pc file."""
+    result = None
+    try:
+        result = subprocess.call(["pkg-config",
+                                   "--exists",
+                                   "%s" % library])
+    except OSError, exception:
+        if exception.errno == 2:
+            raise PkgconfigError(_("pkg-config is not installed on your system."))
+    else:
+        return result == 0