Merge pull request #31 from ernestmc/add_rosfusion_script

Add rosfusion script. Solves #30

rosfusion.py

@@ -0,0 +1,80 @@
+#!/usr/bin/python
+
+# Script to automate fusing rosinstall dependencies
+# It takes two parameters: an origin file and a target file, both in yaml format
+# Warning: the target file we be modified!
+# Searches the target file for the dependecies enumerated by the origin file, and
+# if they are not present, it adds them to the target file.
+
+from optparse import OptionParser
+import yaml
+from pprint import pprint
+
+def errorExit(str):
+    print str
+    exit(1)
+
+# Rosinstall yaml file is a list of key:value pairs for the top level keys
+# This function finds if the needle is already listed in the list of dependencies
+def isListed(needle, haystacklist):
+    found = False
+
+    for listitem in haystacklist:
+        for tpkey,tpdata in listitem.items():
+            if tpdata["local-name"] == needle["local-name"]:
+                found = True
+
+    return found
+
+
+# Get command line parameters
+optparser = OptionParser()
+optparser.add_option("-n", dest="newfile", help="New rosinstall file")
+optparser.add_option("-t", dest="targetfile", help="Target rosinstall file")
+optparser.add_option("-l", dest="listonly", help="Only list the changes")
+
+(options, args) = optparser.parse_args()
+
+#pprint(options)
+
+targetfile = options.targetfile
+newfile = options.newfile
+
+# open the 
+if newfile:
+    newfileh = open(newfile, 'r')
+else:
+    errorExit("Newfile is missing.")
+
+if targetfile:
+    targetfileh = open(targetfile, 'r')
+else:
+    errorExit("Targetfile is missing.")
+
+newfiledata = yaml.load(newfileh)
+targetfiledata = yaml.load(targetfileh)
+
+# close the files we already read
+newfileh.close()
+targetfileh.close()
+
+# open the targetfile for writing
+targetfileh = open(targetfile, 'a') 
+
+# initialize list of dictionary entries for yaml. These are the ones that will need to be added
+addlist = []
+
+# Traverse all items in the newfile and check if they are present in the targetfile
+# if they aren't, we need to add them to the targetfile list
+for li in newfiledata:
+    for k1,d1 in li.items():
+        if not isListed(d1, targetfiledata):
+            addlist.append({k1:d1})
+
+# add the needed packets to the target file
+targetfileh.write(yaml.dump(addlist, default_flow_style=False))
+
+targetfileh.close()
+
+
+