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 #!/usr/bin/python3
 
 # Outputs dependencies information from a build directory
 #
 # Copyright (c) 2014 Aleix Pol Gonzalez <aleixpol@kde.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1. Redistributions of source code must retain the above copyright
 #    notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 #    notice, this list of conditions and the following disclaimer in the
 #    documentation and/or other materials provided with the distribution.
 #
 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 # cmake . --trace |& grep ^/ | grep -v CMakeLists.txt | cut -d '(' -f 1 | sort -u
 
 import subprocess
 import os
 import re
 import json
 import argparse
 import sys
 
 def readCache(varName):
     f = open("CMakeCache.txt", "r")
     for line in f:
         m = re.match('(.*?)=(.*)', line)
         if m is not None and m.group(1)==varName:
             return m.group(2)
 
 def checkPackageVersion(frameworkName):
     value = readCache("FIND_PACKAGE_MESSAGE_DETAILS_%s:INTERNAL" % frameworkName)
     if value is None:
         return None
     m = re.match('.*\\]\\[v(.*?)\\((.*?)\\)\\]', value)
     if m:
         return { 'used': m.group(1), 'requested': m.group(2) }
     else:
         return None
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description='Figures out the dependencies of the build directory in the cwd.')
 
     try:
         projectDir = readCache("CMAKE_HOME_DIRECTORY:INTERNAL")
     except:
         print("Run in a build directory.")
         parser.print_help()
         sys.exit(1)
 
     proc = subprocess.Popen(['cmake', '.', '--trace-expand'], stdout=open(os.devnull, "w"), stderr=subprocess.PIPE)
     processedFiles = {}
     lookedUpPackages = {}
 
     lastFile = ""
     callingFile = ""
     for line in proc.stderr:
         theLine = line.decode("utf-8")
 
         m = re.match('.*?:\s*find_package\((.*?) (.*?)\).*', theLine)
         if m is not None:
             if "$" not in m.group(2):
                 lookedUpPackages[m.group(1)] = m.group(2)
 
         # match file names
         # e.g./usr/share/cmake-3.0/Modules/FindPackageMessage.cmake(46):  set(...
         m = re.match("(^/.*?)\\(.*", theLine)
         if m is not None:
             currentFile = m.group(1)
             if lastFile != currentFile:
                 callingFile = lastFile
             lastFile = currentFile
             filePath, fileName = os.path.split(currentFile)
 
             if fileName == "CMakeLists.txt":
                 continue
 
             m = re.match("(.*)Config(Version)?.cmake", fileName)
             m2 = re.match("Find(.*).cmake", fileName)
             if m2:
                 moduleName = m2.group(1)
             elif m:
                 moduleName = m.group(1)
             else:
                 continue
 
             if not moduleName in processedFiles:
                 processedFiles[moduleName] = { 'files': set(), 'explicit': False }
 
             if not 'version' in processedFiles[moduleName]:
                 processedFiles[moduleName]['version'] = checkPackageVersion(moduleName)
 
             processedFiles[moduleName]['files'].add(currentFile)
             processedFiles[moduleName]['explicit'] |= (callingFile.endswith("CMakeLists.txt") or callingFile.endswith("Qt5/Qt5Config.cmake") or callingFile.endswith("FindKF5.cmake"))
 
     print("[")
     first = True
     for v, value in processedFiles.items():
         if not first:
             print(',\n', end='')
         first = False
 
         value['files'] = list(value['files'])
         value['project'] = v
         if v in lookedUpPackages:
             if value['version'] is None:
                 line = lookedUpPackages[v]
                 isVersion = line[:line.find(' ')]
 
                 if len(isVersion)>0 and isVersion[0].isdigit():
                     value['version'] = { 'used': None, 'requested': isVersion }
 
             del lookedUpPackages[v]
 
         print("\t%s" % (json.dumps(value)), end='')
 
     # display missing packages
     for v in lookedUpPackages:
         if not first:
             print(',\n', end='')
 
         print("\t{ \"project\": \"%s\", \"missing\": true, \"files\": [], \"arguments\": \"%s\", \"explicit\": true }" % (v, lookedUpPackages[v]))
 
 
     print("\n]\n")
     proc.wait()