cmd: Customize to work with MicroPython.

Author: dhylands

cmd/cmd.py

@@ -40,14 +40,25 @@
 `self.undoc_header' set the headers used for the help function's
 listings of documented functions, miscellaneous topics, and undocumented
 functions respectively.
+
+----------------------------------------------------------------------------
+This is a copy of python's Cmd, but leaves out features that aren't relevant
+or can't currently be implemented for MicroPython.
+
+One of the notable deviations is that since MicroPython strips doc strings,
+this means that that help by doc string feature doesn't work.
+
+completions have also been stripped out.
 """
 
-import string, sys
+#import string, sys
+import sys	# MiroPython doesn't yet have a string module
 
 __all__ = ["Cmd"]
 
 PROMPT = '(Cmd) '
-IDENTCHARS = string.ascii_letters + string.digits + '_'
+#IDENTCHARS = string.ascii_letters + string.digits + '_'
+IDENTCHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_'
 
 class Cmd:
     """A simple framework for writing line-oriented command interpreters.
@@ -73,13 +84,10 @@ class Cmd:
     nohelp = "*** No help on %s"
     use_rawinput = 1
 
-    def __init__(self, completekey='tab', stdin=None, stdout=None):
+    def __init__(self, stdin=None, stdout=None):
         """Instantiate a line-oriented interpreter framework.
 
-        The optional argument 'completekey' is the readline name of a
-        completion key; it defaults to the Tab key. If completekey is
-        not None and the readline module is available, command completion
-        is done automatically. The optional arguments stdin and stdout
+        The optional arguments stdin and stdout
         specify alternate input and output file objects; if not specified,
         sys.stdin and sys.stdout are used.
 
@@ -93,7 +101,6 @@ def __init__(self, completekey='tab', stdin=None, stdout=None):
         else:
             self.stdout = sys.stdout
         self.cmdqueue = []
-        self.completekey = completekey
 
     def cmdloop(self, intro=None):
         """Repeatedly issue a prompt, accept input, parse an initial prefix
@@ -103,14 +110,6 @@ def cmdloop(self, intro=None):
         """
 
         self.preloop()
-        if self.use_rawinput and self.completekey:
-            try:
-                import readline
-                self.old_completer = readline.get_completer()
-                readline.set_completer(self.complete)
-                readline.parse_and_bind(self.completekey+": complete")
-            except ImportError:
-                pass
         try:
             if intro is not None:
                 self.intro = intro
@@ -139,13 +138,7 @@ def cmdloop(self, intro=None):
                 stop = self.postcmd(stop, line)
             self.postloop()
         finally:
-            if self.use_rawinput and self.completekey:
-                try:
-                    import readline
-                    readline.set_completer(self.old_completer)
-                except ImportError:
-                    pass
-
+            pass
 
     def precmd(self, line):
         """Hook method executed just before the command line is
@@ -235,74 +228,18 @@ def default(self, line):
         """
         self.stdout.write('*** Unknown syntax: %s\n'%line)
 
-    def completedefault(self, *ignored):
-        """Method called to complete an input line when no command-specific
-        complete_*() method is available.
-
-        By default, it returns an empty list.
-
-        """
-        return []
-
-    def completenames(self, text, *ignored):
-        dotext = 'do_'+text
-        return [a[3:] for a in self.get_names() if a.startswith(dotext)]
-
-    def complete(self, text, state):
-        """Return the next possible completion for 'text'.
-
-        If a command has not been entered, then complete against command list.
-        Otherwise try to call complete_<command> to get list of completions.
-        """
-        if state == 0:
-            import readline
-            origline = readline.get_line_buffer()
-            line = origline.lstrip()
-            stripped = len(origline) - len(line)
-            begidx = readline.get_begidx() - stripped
-            endidx = readline.get_endidx() - stripped
-            if begidx>0:
-                cmd, args, foo = self.parseline(line)
-                if cmd == '':
-                    compfunc = self.completedefault
-                else:
-                    try:
-                        compfunc = getattr(self, 'complete_' + cmd)
-                    except AttributeError:
-                        compfunc = self.completedefault
-            else:
-                compfunc = self.completenames
-            self.completion_matches = compfunc(text, line, begidx, endidx)
-        try:
-            return self.completion_matches[state]
-        except IndexError:
-            return None
-
     def get_names(self):
         # This method used to pull in base class attributes
         # at a time dir() didn't do it yet.
         return dir(self.__class__)
 
-    def complete_help(self, *args):
-        commands = set(self.completenames(*args))
-        topics = set(a[5:] for a in self.get_names()
-                     if a.startswith('help_' + args[0]))
-        return list(commands | topics)
-
     def do_help(self, arg):
         'List available commands with "help" or detailed help with "help cmd".'
         if arg:
             # XXX check arg syntax
             try:
                 func = getattr(self, 'help_' + arg)
             except AttributeError:
-                try:
-                    doc=getattr(self, 'do_' + arg).__doc__
-                    if doc:
-                        self.stdout.write("%s\n"%str(doc))
-                        return
-                except AttributeError:
-                    pass
                 self.stdout.write("%s\n"%str(self.nohelp % (arg,)))
                 return
             func()
@@ -326,8 +263,6 @@ def do_help(self, arg):
                     if cmd in help:
                         cmds_doc.append(cmd)
                         del help[cmd]
-                    elif getattr(self, name).__doc__:
-                        cmds_doc.append(cmd)
                     else:
                         cmds_undoc.append(cmd)
             self.stdout.write("%s\n"%str(self.doc_leader))
@@ -397,5 +332,6 @@ def columnize(self, list, displaywidth=80):
             while texts and not texts[-1]:
                 del texts[-1]
             for col in range(len(texts)):
-                texts[col] = texts[col].ljust(colwidths[col])
+                #texts[col] = texts[col].ljust(colwidths[col])
+                texts[col] = '%-*s' % (colwidths[col], texts[col])
             self.stdout.write("%s\n"%str("  ".join(texts)))

cmd/metadata.txt

@@ -0,0 +1,3 @@
+srctype = cpython
+type = module
+version = 0.0.1

cmd/setup.py

@@ -0,0 +1,18 @@
+import sys
+# Remove current dir from sys.path, otherwise setuptools will peek up our
+# module instead of system.
+sys.path.pop(0)
+from setuptools import setup
+
+
+setup(name='micropython-cmd',
+      version='0.0.1',
+      description='CPython cmd module ported to MicroPython',
+      long_description='This is a module ported from CPython standard library to be compatible with\nMicroPython interpreter. Usually, this means applying small patches for\nfeatures not supported (yet, or at all) in MicroPython. Sometimes, heavier\nchanges are required. Note that CPython modules are written with availability\nof vast resources in mind, and may not work for MicroPython ports with\nlimited heap. If you are affected by such a case, please help reimplement\nthe module from scratch.',
+      url='https://github.com/micropython/micropython/issues/405',
+      author='CPython Developers',
+      author_email='python-dev@python.org',
+      maintainer='MicroPython Developers',
+      maintainer_email='micro-python@googlegroups.com',
+      license='Python',
+      py_modules=['cmd'])