diff --git a/shell/modules/help.py.in b/shell/modules/help.py.in index 12cda4d8e7..cf62991ebe 100644 --- a/shell/modules/help.py.in +++ b/shell/modules/help.py.in @@ -1,274 +1,276 @@ # Copyright (C) 2008 Dejan Muhamedagic # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This software is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. # # You should have received a copy of the GNU General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # import os import re from cache import WCache from utils import odict, page_string from msg import * # # help or make users feel less lonely # def add_shorthelp(topic,shorthelp,topic_help): ''' Join topics ("%s,%s") if they share the same short description. ''' for i in range(len(topic_help)): if topic_help[i][1] == shorthelp: topic_help[i][0] = "%s,%s" % (topic_help[i][0], topic) return topic_help.append([topic, shorthelp]) def dump_short_help(help_tab): topic_help = [] for topic in help_tab: if topic == '.': continue # with odict, for whatever reason, python parses differently: # help_tab["..."] = ("...","...") and # help_tab["..."] = ("...",""" # ...""") # a parser bug? if type(help_tab[topic][0]) == type(()): shorthelp = help_tab[topic][0][0] else: shorthelp = help_tab[topic][0] add_shorthelp(topic,shorthelp,topic_help) for t,d in topic_help: print "\t%-16s %s" % (t,d) def overview(help_tab): print "" print help_tab['.'][1] print "" print "Available commands:" print "" dump_short_help(help_tab) print "" def topic_help(help_tab,topic): if topic not in help_tab: print "There is no help for topic %s" % topic return if type(help_tab[topic][0]) == type(()): shorthelp = help_tab[topic][0][0] longhelp = help_tab[topic][0][1] else: shorthelp = help_tab[topic][0] longhelp = help_tab[topic][1] if longhelp: page_string(longhelp) else: print shorthelp def cmd_help(help_tab,topic = ''): "help!" # help_tab is an odict (ordered dictionary): # help_tab[topic] = (short_help,long_help) # topic '.' is a special entry for the top level if not help_tab: common_info("sorry, help not available") return if not topic: overview(help_tab) else: topic_help(help_tab,topic) def is_level(s): return len(s.split("_")) == 2 def help_short(s): r = re.search("help_[^,]+,(.*)\]\]", s) return r and r.group(1) or '' class HelpSystem(object): ''' The help system. All help is in the following form in the manual: [[cmdhelp__,]] === ... Long help text. ... [[cmdhelp__,]] Help for the level itself is like this: [[cmdhelp_,]] ''' help_text_file = "@datadir@/@PACKAGE@/crm_cli.txt" index_file = "%s/%s" % (os.getenv("HOME"),".crm_help_index") def __init__(self): self.key_pos = {} self.leveld = {} self.no_help_file = False # don't print repeatedly messages self.bad_index = False # don't print repeatedly warnings for bad index def open_file(self,name,mode): try: f = open(name,mode) return f except IOError,msg: common_err("%s open: %s"%(name,msg)) common_err("extensive help system is not available") self.no_help_file = True return None def drop_index(self): common_info("removing index") os.unlink(self.index_file) self.key_pos = {} self.leveld = {} self.bad_index = True def mk_index(self): ''' Prepare an index file, sorted by topic, with seek positions Do we need a hash on content? ''' if self.no_help_file: return False crm_help_v = os.getenv("CRM_HELP_FILE") if crm_help_v: self.help_text_file = crm_help_v help_f = self.open_file(self.help_text_file,"r") if not help_f: return False idx_f = self.open_file(self.index_file,"w") if not idx_f: return False common_info("building help index") key_pos = odict() while 1: pos = help_f.tell() s = help_f.readline() if not s: break if s.startswith("[["): r = re.search(r'..([^,]+),', s) if r: key_pos[r.group(1)] = pos help_f.close() for key in key_pos: print >>idx_f, '%s %d' % (key,key_pos[key]) idx_f.close() return True def is_index_old(self): try: t_idx = os.path.getmtime(self.index_file) except: return True try: t_help = os.path.getmtime(self.help_text_file) except: return True return t_help > t_idx def load_index(self): if self.is_index_old(): self.mk_index() self.key_pos = {} self.leveld = {} idx_f = self.open_file(self.index_file,"r") if not idx_f: return False cur_lvl = '' for s in idx_f: a = s.split() if len(a) != 2: if not self.bad_index: common_err("index file corrupt") idx_f.close() self.drop_index() return self.load_index() # this runs only once return False key = a[0] fpos = long(a[1]) if key.startswith("cmdhelp_"): if is_level(key): if key != cur_lvl: cur_lvl = key self.leveld[cur_lvl] = [] else: self.leveld[cur_lvl].append(key) self.key_pos[key] = fpos idx_f.close() return True def __filter(self,s): if '<<' in s: return re.sub(r'<<[^,]+,(.+)>>', r'\1', s) else: return s def __load_help_one(self,key,skip = 2): longhelp = '' self.help_f.seek(self.key_pos[key]) shorthelp = help_short(self.help_f.readline()) for i in range(skip-1): self.help_f.readline() l = [] for s in self.help_f: if s.startswith("[[") or s.startswith("="): break l.append(self.__filter(s)) if l and l[-1] == '\n': # drop the last line of empty l.pop() if l: longhelp = ''.join(l) if not shorthelp or not longhelp: if not self.bad_index: common_warn("help topic %s not found" % key) self.drop_index() return shorthelp,longhelp def cmdhelp(self,s): if not self.key_pos and not self.load_index(): return None,None if not s in self.key_pos: if not self.bad_index: common_warn("help topic %s not found" % s) self.drop_index() return None,None return self.__load_help_one(s) def __load_level(self,lvl): ''' For the given level, create a help table. ''' if wcache.is_cached("lvl_help_tab_%s" % lvl): return wcache.retrieve("lvl_help_tab_%s" % lvl) if not self.key_pos and not self.load_index(): return None self.help_f = self.open_file(self.help_text_file,"r") if not self.help_f: return None lvl_s = "cmdhelp_%s" % lvl if not lvl_s in self.leveld: if not self.bad_index: common_warn("help table for level %s not found" % lvl) self.drop_index() return None common_debug("loading help table for level %s" % lvl) help_tab = odict() help_tab["."] = self.__load_help_one(lvl_s) - for key in self.leveld[lvl_s]: - cmd = key[len(lvl_s)+1:] - help_tab[cmd] = self.__load_help_one(key) + try: + for key in self.leveld[lvl_s]: + cmd = key[len(lvl_s)+1:] + help_tab[cmd] = self.__load_help_one(key) + except: pass self.help_f.close() help_tab["quit"] = ("exit the program", "") help_tab["help"] = ("show help", "") help_tab["end"] = ("go back one level", "") return help_tab def load_level(self,lvl): help_tab = self.__load_level(lvl) if self.bad_index: # try again help_tab = self.__load_level(lvl) return wcache.store("lvl_help_tab_%s" % lvl, help_tab) wcache = WCache.getInstance() # vim:ts=4:sw=4:et: