add two new scripts :

fastaHead and fastaTail

src/fastaHead.py

@@ -0,0 +1,37 @@
+#!/usr/local/bin/python
+'''
+Created on 15 d<>c. 2009
+
+@author: coissac
+'''
+from obitools.fasta import fastaIterator,formatFasta
+from obitools.options import getOptionManager
+
+import sys
+
+def addHeadOptions(optionManager):
+    optionManager.add_option('-n','--sequence-count',
+                             action="store", dest="count",
+                             metavar="###",
+                             type="int",
+                             default=10,
+                             help="Count of first sequences to print")
+    
+
+if __name__ == '__main__':
+    optionParser = getOptionManager([addHeadOptions],
+                                    entryIterator=fastaIterator
+                                    )
+    
+    (options, entries) = optionParser()
+    i=0
+    
+    for s in entries:
+        if i < options.count:
+            print formatFasta(s)
+            i+=1
+        else:
+            sys.exit(0)
+            
+        
+

src/fastaTail.py

@@ -0,0 +1,41 @@
+#!/usr/local/bin/python
+'''
+Created on 15 d<>c. 2009
+
+@author: coissac
+'''
+from obitools.fasta import fastaIterator,formatFasta
+from obitools.options import getOptionManager
+import collections
+
+def addHeadOptions(optionManager):
+    optionManager.add_option('-n','--sequence-count',
+                             action="store", dest="count",
+                             metavar="###",
+                             type="int",
+                             default=10,
+                             help="Count of first sequences to print")
+    
+
+if __name__ == '__main__':
+    optionParser = getOptionManager([addHeadOptions],
+                                    entryIterator=fastaIterator
+                                    )
+    
+    (options, entries) = optionParser()
+    i=0
+    
+    queue = collections.deque()
+    
+    
+    for s in entries:
+        queue.append(s)
+        if len(queue) > options.count:
+            queue.popleft()
+
+    while queue:
+        print formatFasta(queue.popleft())
+        
+        
+        
+