pmacs3/ispell.py

#!/usr/bin/env python
import os, sys
from subprocess import Popen, PIPE, STDOUT
import cache

_speller   = None
_can_spell = os.system('which ispell > /dev/null 2>&1') == 0

def can_spell():
    return _can_spell
def get_speller():
    global _speller
    if _can_spell and not _speller:
        _speller = Speller()
    return _speller
def free():
    if _speller:
        _speller.close()

class Speller(object):
    def __init__(self, cmd='ispell'):
        self.pipe = None
        self.cache = cache.CacheDict()
        self.cmd = cmd
        self.start()

    def start(self):
        assert self.pipe is None
        self.pipe = Popen('%s -a' % self.cmd, shell=True, stdin=PIPE, stdout=PIPE)
        self.pipe.stdout.readline()

    def stop(self):
        self.pipe.stdin.close()
        self.pipe.stdout.close()
        self.pipe = None

    def restart(self):
        self.stop()
        self.start()

    def flush(self, word):
        if word in self.cache:
            del self.cache[word]

    def check(self, word, caps=False, title=True):
        # here are some quick checks:
        # 1. zero-length words
        # 2. all-caps word
        # 3. words whose first letter is capitalized
        if len(word) == 0:
            return True
        elif not caps and word.isupper():
            return True
        elif not title and word[0].isupper():
            return True

        result = False
        if word in self.cache:
            result = self.cache[word]
        else:
            if self.pipe.poll() >= 0:
                self.pipe = None
                self.start()
            self.pipe.stdin.write("%s\n" % (word))
            self.pipe.stdin.flush()
            l = self.pipe.stdout.readline()
            if l.startswith("*") or l.startswith("+") or l.startswith("-"):
                result = True
            while True:
                l = self.pipe.stdout.readline()
                if l == "\n":
                    break
            self.cache[word] = result
        return result

    def learn(self, word):
        if self.pipe.poll() >= 0:
            self.pipe = None
            self.start()
        self.pipe.stdin.write("*%s\n" % (word))
        self.pipe.stdin.flush()
        self.flush(word)

if __name__ == "__main__":
    s = Speller()
    while True:
        sys.stdout.write('enter a word: ')
        line = sys.stdin.readline()
        if not line:
            print
            break
        elif line == '\n':
            continue
        elif ' ' in line:
            print 'please enter a single world'
            continue
        for word in line.split('-'):
            word = word.strip()
            if s.check(word):
                print '%s: ok' % word
            else:
                print '%s: misspelled' % word