implemented ledit extension (line editor) that adds %led magic

IPython/Extensions/ledit.py

@@ -0,0 +1,98 b''
+""" Fun magic line editor for ipython 
+
+Use this to easily edit lists of strings gradually without crafting long 
+list comprehensions.
+
+'l' is the magic variable name for every line (array element). Save the current 
+result (or more exactly, retrieve the last ipython computation result into
+%led work area) by running '%led s'. Just run '%led' to show the current work
+area data.
+
+Example use:
+
+[ipython]|25> setups = !ls *setup*.py
+ ==
+['eggsetup.py', 'setup.py', 'setup_bdist_egg.py']
+[ipython]|26> setups
+         <26> ['eggsetup.py', 'setup.py', 'setup_bdist_egg.py']
+[ipython]|27> %led s
+Data set from last result (_)
+         <27> ['eggsetup.py', 'setup.py', 'setup_bdist_egg.py']
+[ipython]|28> %led upper
+cmd translated => l.upper()
+         <28> ['EGGSETUP.PY', 'SETUP.PY', 'SETUP_BDIST_EGG.PY']
+[ipython]|29> %led
+Magic line editor (for lists of strings)
+current data is:
+['eggsetup.py', 'setup.py', 'setup_bdist_egg.py']
+[ipython]|30> %led upper
+cmd translated => l.upper()
+         <30> ['EGGSETUP.PY', 'SETUP.PY', 'SETUP_BDIST_EGG.PY']
+[ipython]|31> %led s
+Data set from last result (_)
+         <31> ['EGGSETUP.PY', 'SETUP.PY', 'SETUP_BDIST_EGG.PY']
+[ipython]|32> %led "n:" + l
+         <32> ['n:EGGSETUP.PY', 'n:SETUP.PY', 'n:SETUP_BDIST_EGG.PY']
+[ipython]|33> %led s
+Data set from last result (_)
+         <33> ['n:EGGSETUP.PY', 'n:SETUP.PY', 'n:SETUP_BDIST_EGG.PY']
+[ipython]|34> %led l.
+l.__add__          l.__gt__           l.__reduce_ex__    l.endswith         l.join             l.rstrip
+l.__class__        l.__hash__         l.__repr__         l.expandtabs       l.ljust            l.split
+
+... (completions for string variable shown ) ...
+
+"""
+import IPython.ipapi
+import pprint
+ip = IPython.ipapi.get()
+
+curdata = []
+
+def line_edit_f(self, cmd ):
+    global curdata
+    
+    if not cmd:
+        
+        print "Magic line editor (for lists of strings)"
+        if curdata:
+            print "current data is:"
+            pprint.pprint(curdata)
+        else:
+            print "No current data, you should set it by running '%led s'"
+            print "When you have your data in _ (result of last computation)."
+        return
+        
+    if cmd == 's':
+        curdata = ip.ev('_')
+        print "Data set from last result (_)"
+        newlines = curdata
+        
+    else:
+        # simple method call, e.g. upper
+        if cmd.isalpha():
+            cmd = 'l.' + cmd + '()'
+            print "cmd translated =>",cmd
+
+        newlines = []
+        for l in curdata:
+            try:
+                l2 = eval(cmd)
+            except Exception,e:
+                print "Dropping exception",e,"on line:",l
+                continue
+            newlines.append(l2)
+
+    
+    return newlines
+
+def line_edit_complete_f(self,event):
+    """ Show all string methods in completions """
+    if event.symbol.startswith('l.'):
+        return ['l.' + func for func in dir('')]
+    
+    return dir('') + ['l.' + func for func in dir('')]
+
+ip.set_hook('complete_command', line_edit_complete_f , str_key = '%led')
+        
+ip.expose_magic('led', line_edit_f)
  No newline at end of file

doc/ChangeLog

@@ -5,6 +5,10 b''
 	trivial completer for 'import' (stdlib modules only). Rename 
 	ipy_linux_package_managers.py to ipy_stock_completers.py.
 	SVN completer.
+	
+	* Extensions/ledit.py: %magic line editor for easily and
+	incrementally manipulating lists of strings. The magic command
+	name is %led.
 
 2006-10-30  Ville Vainio  <[e-mail]>