Explain the prefix stuff a bit more

[saartuer.git] / tyshell

diff --git a/tyshell b/tyshell
index 0b9b94361fde70972e65c48a897716e7ee8f9316..4429c354a2102fbef3d0a75d937e3668921b3bc4 100755 (executable)
--- a/tyshell
+++ b/tyshell
@@ -20,7 +20,7 @@ atexit.register(print, "Bye")
 
 # available commands
 def helpcmd(c):
-       print("Available commands: %s" % ", ".join(sorted(longcommands.keys())))
+       print("Available commands: %s" % ", ".join(sorted(commands.keys())))
 
 def extcmd(cmd):
        def run(c):
@@ -53,39 +53,6 @@ commands = {
        'buzz': sendcmd(tuerSock, 'buzz'),
 }
 
-# command convenience shortcuts
-def filterCommonPrefix (strings, length):
-       # ignores duplicates in the string list "strings"
-       toremove=[]
-       for a in strings:
-               for b in strings:
-                       if a != b:
-                               if a[:length] == b[:length]:
-                                       toremove.append(a)
-                                       toremove.append(b)
-       ret = list(strings) # copy
-       for x in toremove:
-               try:
-                       ret.remove(x)
-               except ValueError:
-                       pass
-       return ret
-
-def shortcutify (dic):
-       maxlen = 0
-       for x in dic.keys():
-               if len(x) > maxlen:
-                       maxlen = len(x)
-       for i in range(maxlen):
-               shortable = filterCommonPrefix (dic.keys(), i)
-               for x in shortable:
-                       dic[x[:i]] = dic[x]
-       return dic # only for convenience, as dic is passed by reference
-
-longcommands = commands.copy()
-shortcutify (commands)
-
-
 # input loop
 print("Welcome to tyshell. Use help to see what you can do.")
 while True:
@@ -96,12 +63,20 @@ while True:
                break
        command = shlex.split(command)
        if not len(command): continue
-       # execute command
-       if command[0] in commands:
+       # find suiting commands
+       if command[0] in commands: # needed in case a complete command is a prefix of another one
+               cmdoptions = [command[0]]
+       else:
+               cmdoptions = list(filter(lambda x: command[0].startswith(x), commands.keys()))
+       if len(cmdoptions) == 0: # no commands fit prefix
+               print("Command %s not found. Use help." % command[0])
+       elif len(cmdoptions) == 1: # exactly one command fits (prefix)
                try:
-                       commands[command[0]](command)
+                       commands[cmdoptions[0]](command)
                except Exception as e:
                        print("Error while executing %s: %s" % (command[0], str(e)))
-       else:
-               print("Command %s not found. Use help." % command[0])
+       else: # multiple commands fit the prefix
+               print("Ambiguous command prefix, please choose one of the following:")
+               print("\t", " ".join(cmdoptions))
+               # TODO: put current "command[0]" into the shell for the next command, but such that it is deletable with backspace