import dirutil, os
from buffer import Buffer

class DirBuffer(Buffer):
    btype = 'dir'
    def __init__(self, path, name=None):
        Buffer.__init__(self)
        self.path = os.path.realpath(path)
    def changed(self):
        return False
    def readonly(self):
        return True
    def name(self):
        return self.path
    def path_exists(self):
        return os.path.exists(self.path)

    def _get_names(self):
        if not self.path_exists():
            raise Exception, "directory %r does not exists" % self.path
        names = os.listdir(self.path)
        if self.path != '/':
            names.insert(0, '..')
        names.insert(0, '.')
        return names
    def _make_path(self, name):
        return os.path.join(self.path, name)
    def _get_lines(self):
        names = self._get_names()

        fieldlines = []
        maxlens = [0] * 5
        for name in names:
            path = self._make_path(name)
            fields = dirutil.path_fields(path, name)
            for i in range(0, 5):
                try:
                    maxlens[i] = max(maxlens[i], len(fields[i]))
                except:
                    raise Exception, '%d %r' % (i, fields[i])
            fieldlines.append(fields)
        
        fieldlines.sort(cmp=dirutil.path_sort)
        fmt = '%%%ds %%-%ds %%-%ds %%%ds %%%ds %%s' % tuple(maxlens)

        lines = []
        for fields in fieldlines:
            s = fmt % fields
            lines.append(s)
        return lines
    def open(self):
        self.lines = self._get_lines()
    def reload(self):
        lines = self._get_lines()
        self.set_lines(lines, force=True)
    def save(self, force=False):
        raise Exception, "can't save a directory buffer"
    def save_as(self, path):
        raise Exception, "can't save a directory buffer"

class PathListBuffer(DirBuffer):
    btype = 'pathlist'
    def __init__(self, name, paths):
        Buffer.__init__(self)
        self.paths = list(paths)
        self.path  = os.getcwd()
        self._name = name
    def path_exists(self):
        raise Exception
    def _get_names(self):
        cwd = os.getcwd()
        return [x.replace(cwd, '.', 1) for x in self.paths]
    def _make_path(self, name):
        if name.startswith('.'):
            return name.replace('.', os.getcwd(), 1)
        else:
            return name
    def name(self):
        return self._name