[processing] add method for generating help for single algorithm

Author: alexbruy

python/plugins/processing/tools/help.py

@@ -31,7 +31,7 @@
 from processing.tools.system import mkdir
 
 
-def createBaseHelpFile(alg, folder):
+def baseHelpForAlgorithm(alg, folder):
     baseDir = os.path.join(folder, alg.provider.getName().lower())
     mkdir(baseDir)
 
@@ -109,4 +109,9 @@ def createBaseHelpFiles(folder):
             continue
 
         for alg in provider.algs:
-            createBaseHelpFile(alg, folder)
+            baseHelpForAlgorithm(alg, folder)
+
+
+def createAlgorithmHelp(algName, folder):
+    alg = Processing.getAlgorithm(algName)
+    baseHelpForAlgorithm(alg, folder)