import code, os, re, string, StringIO, sys, traceback
import buffer, color, completer, lex, method, mode, window
from lex import Grammar, PatternRule, RegionRule
from point import Point
from method import Method
from subprocess import Popen, PIPE, STDOUT

class ShellExec(Method):
    def _execute(self, w, **vargs):
        a = w.application
        if a.completion_window_is_open():
            a.close_completion_buffer()

        s = w.buffer.make_string()
        w.mode.history[-1] = s
        w.mode.history.append('')
        w.buffer.set_data('')
        w.mode.hindex = len(w.mode.history) - 1

        if not a.has_buffer_name('*Shell*'):
            raise Exception, "No shell found!"
        b = a.bufferlist.get_buffer_by_name('*Shell*')
        if a.window().buffer is not b:
            a.switch_buffer(b)
        b.pipe_write(s + "\n")

class ShellCancel(Method):
    def execute(self, w, **vargs):
        w.application.close_mini_buffer()
        if w.application.completion_window_is_open():
            w.application.close_completion_buffer()
class ShellClear(Method):
    def execute(self, w, **vargs):
        a = w.application
        if not a.has_buffer_name('*Shell*'):
            raise Exception, "No shell found!"
        b = a.bufferlist.get_buffer_by_name('*Shell*')

class ShellHistoryPrev(Method):
    def execute(self, w, **vargs):
        if w.mode.hindex <= 0:
            w.mode.hindex = 0
            return
        elif w.mode.hindex == len(w.mode.history) - 1:
            w.mode.history[-1] = w.buffer.make_string()
        w.mode.hindex -= 1
        w.buffer.set_data(w.mode.history[w.mode.hindex])
class ShellHistoryNext(Method):
    def execute(self, w, **vargs):
        if w.mode.hindex == len(w.mode.history) - 1:
            return
        w.mode.hindex += 1
        w.buffer.set_data(w.mode.history[w.mode.hindex])

class ShellTab(Method):
    def execute(self, w, **vargs):
        a = w.application
        s = w.buffer.make_string()

        x = w.logical_cursor().x
        if not s or s[:x].isspace():
            w.insert_string_at_cursor(' ' * w.mode.tabwidth)
            return

        l = lex.Lexer(w.mode, ShellMiniGrammar)
        tokens = list(l.lex([s]))

        curr_t = None
        curr_i = None
        for i in range(0, len(tokens)):
            t = tokens[i]
            if t.x < x and t.end_x() >= x:
                curr_i = i
                curr_t = t
        if curr_t is None:
            return

        if(i == 0) and '/' not in curr_t.string:
            # we are completing a command
            candidates = []
        else:
            # we are completing a path
            cwd = os.getcwd()
            if not cwd.endswith('/'):
                cwd += '/'
            path = cwd + curr_t.string
            (d, name) = os.path.split(path)
            names = []
            for x in os.listdir(d):
                if os.path.isdir(os.path.join(d, x)):
                    names.append(x + '/')
                else:
                    names.append(x)
            candidates = [x for x in names if x.startswith(name)]

        s = completer.find_common_string(candidates)[len(name):]
        w.insert_string_at_cursor(s)
        mode.mini.use_completion_window(a, name, candidates)

class ShellBaseMethod(Method):
    subcls = Method
    subbuf = '*Shell*'
    def __init__(self):
        Method.__init__(self)
        self.submethod = self.subcls()
    def _execute(self, w, **vargs):
        a = w.application
        if not a.has_buffer_name(self.subbuf):
            raise Exception, "No shell found!"
        w2 = a.bufferlist.get_buffer_by_name(self.subbuf).windows[0]
        self.submethod.execute(w2, **vargs)

class ShellPageUp(ShellBaseMethod):
    subcls = method.move.PageUp
class ShellPageDown(ShellBaseMethod):
    subcls = method.move.PageDown
class ShellGotoBeginning(ShellBaseMethod):
    subcls = method.move.GotoBeginning
class ShellGotoEnd(ShellBaseMethod):
    subcls = method.move.GotoEnd

class OpenShell(Method):
    '''Evaluate sh expressions'''
    def execute(self, w, **vargs):
        a = w.application
        if not a.has_buffer_name('*Shell*'):
            b = buffer.PipeBuffer('/bin/bash', [], name="*Shell*", term='xterm')
            a.add_buffer(b)
            window.Window(b, a)
        b = a.bufferlist.get_buffer_by_name('*Shell*')
        if a.window().buffer is not b:
            a.switch_buffer(b)
        f = lambda x: None
        w.application.open_mini_buffer('>>> ', f, self, None, 'shellmini')

class ShellMini(mode.Fundamental):
    modename = 'ShellMini'
    actions  = [ShellExec, ShellClear, ShellCancel,
                ShellHistoryPrev, ShellHistoryNext,
                ShellTab,
                ShellPageUp, ShellPageDown, ShellGotoBeginning, ShellGotoEnd,
                OpenShell]
    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.saved_input = ""
        self.history     = ['']
        self.hindex      = 0
        self.add_bindings('shell-exec', ('RETURN',))
        self.add_bindings('shell-clear', ('C-l',))
        self.add_bindings('shell-cancel', ('C-]', 'C-g'))
        self.add_bindings('shell-history-prev', ('C-p', 'UP'))
        self.add_bindings('shell-history-next', ('C-n', 'DOWN'))
        self.add_bindings('shell-tab', ('TAB',))
        self.add_bindings('shell-page-up', ('M-v',))
        self.add_bindings('shell-page-down', ('C-v',))
        self.add_bindings('shell-goto-beginning', ('M-<',))
        self.add_bindings('shell-goto-end', ('M->',))

install = ShellMini.install