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sublime_haskell_common.py
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sublime_haskell_common.py
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import errno
import fnmatch
import os
import sublime
import subprocess
import threading
# Maximum seconds to wait for window to appear
# This dirty hack is used in wait_for_window function
MAX_WAIT_FOR_WINDOW = 10
# The path to where this package is installed:
PACKAGE_PATH = os.path.join(sublime.packages_path(), 'SublimeHaskell')
# Panel for SublimeHaskell errors
SUBLIME_ERROR_PANEL_NAME = 'haskell_sublime_load'
# Setting can't be get from not main threads
# So we using a trick:
# Once setting loaded from main thread, it also stored in sublime_haskell_settings dictionary
# and callback attached to update its value
# And then setting can be get from any thread with get_setting_async
# But setting must be loaded at least once from main thread
# Some settings are loaded only from secondary threads, so we loading them here for first time
def preload_settings():
# Now we can use get_setting_async for 'add_to_PATH' safely
get_setting('add_to_PATH')
get_setting('use_cabal_dev')
get_setting('cabal_dev_sandbox')
get_setting('cabal_dev_sandbox_list')
get_setting('enable_auto_build')
get_setting('show_output_window')
get_setting('enable_ghc_mod')
get_setting('snippet_replace')
# SublimeHaskell settings dictionary
# used to retrieve it async from any thread
sublime_haskell_settings = {}
def is_enabled_haskell_command(view = None, must_be_project=True, must_be_main=False, must_be_file = False):
"""Returns True if command for .hs can be invoked"""
window, view, file_shown_in_view = get_haskell_command_window_view_file_project(view)
if not window or not view:
return False
if must_be_file and not file_shown_in_view:
return False
syntax_file_for_view = view.settings().get('syntax').lower()
if 'haskell' not in syntax_file_for_view:
return False
if not must_be_project:
return True
cabal_project_dir = get_cabal_project_dir_of_view(view)
if not cabal_project_dir:
return False
return True
def get_haskell_command_window_view_file_project(view = None):
"""Returns window, view and file"""
if view:
return view.window(), view, view.file_name()
window = sublime.active_window()
view = None
if window:
view = window.active_view()
file_name = None
if view:
file_name = view.file_name()
return window, view, file_name
def call_and_wait(command, **popen_kwargs):
return call_and_wait_with_input(command, None, **popen_kwargs)
def call_and_wait_with_input(command, input_string, **popen_kwargs):
"""Run the specified command, block until it completes, and return
the exit code, stdout, and stderr.
Extends os.environment['PATH'] with the 'add_to_PATH' setting.
Additional parameters to Popen can be specified as keyword parameters."""
if subprocess.mswindows:
startupinfo = subprocess.STARTUPINFO()
startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
popen_kwargs['startupinfo'] = startupinfo
# For the subprocess, extend the env PATH to include the 'add_to_PATH' setting.
extended_env = dict(os.environ)
PATH = os.getenv('PATH') or ""
extended_env['PATH'] = ':'.join(get_setting_async('add_to_PATH', []) + [PATH])
process = subprocess.Popen(
command,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
stdin=subprocess.PIPE,
env=extended_env,
**popen_kwargs)
stdout, stderr = process.communicate(input_string)
exit_code = process.wait()
return (exit_code, stdout, stderr)
def log(message):
print(u'Sublime Haskell: {0}'.format(message))
def get_cabal_project_dir_and_name_of_view(view):
"""Return the path to the .cabal file project for the source file in the
specified view. The view must show a saved file, the file must be Haskell
source code, and the file must be under a directory containing a .cabal file.
Otherwise, return None.
"""
# Check that the view is showing a saved file:
file_shown_in_view = view.file_name()
if file_shown_in_view is None:
return None, None
# Check that the file is Haskell source code:
syntax_file_for_view = view.settings().get('syntax').lower()
if 'haskell' not in syntax_file_for_view:
return None, None
return get_cabal_project_dir_and_name_of_file(file_shown_in_view)
def get_cabal_project_dir_of_view(view):
return get_cabal_project_dir_and_name_of_view(view)[0]
def get_cabal_project_dir_and_name_of_file(filename):
"""Return the path to the .cabal file and name of project for the specified file."""
# Check that a .cabal file is present:
directory_of_file = os.path.dirname(filename)
cabal_file_path = find_file_in_parent_dir(directory_of_file, '*.cabal')
if cabal_file_path is None:
return None, None
# Return the directory containing the .cabal file:
project_path, cabal_file = os.path.split(cabal_file_path)
project_name = os.path.splitext(cabal_file)[0]
return project_path, project_name
def get_cabal_project_dir_of_file(filename):
"""Return the path to the .cabal file project for the specified file."""
return get_cabal_project_dir_and_name_of_file(filename)[0]
def get_cabal_in_dir(cabal_dir):
"""Return .cabal file for cabal directory"""
for entry in os.listdir(cabal_dir):
if entry.endswith(".cabal"):
project_name = os.path.splitext(entry)[0]
return (project_name, os.path.join(cabal_dir, entry))
return (None, None)
def find_file_in_parent_dir(subdirectory, filename_pattern):
"""Look for a file with the specified name in a parent directory of the
specified directory. If found, return the file's full path. Otherwise,
return None."""
current_dir = subdirectory
while True:
# See if the current directory contains the desired file:
for name in os.listdir(current_dir):
full_path = os.path.join(current_dir, name)
matches_pattern = fnmatch.fnmatch(name, filename_pattern)
if matches_pattern and os.path.isfile(full_path):
return full_path
# Get the next directory up:
last_dir = current_dir
current_dir = os.path.dirname(current_dir)
# Check to see if we have reached the root directory:
if last_dir == current_dir:
return None
def are_paths_equal(path, other_path):
"Test whether filesystem paths are equal."
path = os.path.abspath(path)
other_path = os.path.abspath(other_path)
return path == other_path
def attach_sandbox(cmd):
"""Attach sandbox arguments to command"""
sand = get_setting_async('cabal_dev_sandbox')
if len(sand) > 0:
return cmd + ['-s', sand]
return cmd
def try_attach_sandbox(cmd):
"""Attach sandbox if use_cabal_dev enabled"""
if not get_setting_async('use_cabal_dev'):
return cmd
return attach_sandbox(cmd)
def get_settings():
return sublime.load_settings("SublimeHaskell.sublime-settings")
def save_settings():
sublime.save_settings("SublimeHaskell.sublime-settings")
def get_setting(key, default=None):
"This should be used only from main thread"
# Get setting
result = get_settings().get(key, default)
# Key was not retrieved, save its value and add callback to auto-update
if key not in sublime_haskell_settings:
sublime_haskell_settings[key] = result
get_settings().add_on_change(key, lambda: update_setting(key))
return result
preload_settings()
def update_setting(key):
"Updates setting as it was changed"
sublime_haskell_settings[key] = get_setting(key)
def get_setting_async(key, default=None):
"""
Get setting from any thread
Note, that setting must be loaded before by get_setting from main thread
"""
# Reload it in main thread for future calls of get_setting_async
sublime.set_timeout(lambda: update_setting(key), 0)
if key not in sublime_haskell_settings:
# Load it in main thread, but for now all we can do is result default
return default
return sublime_haskell_settings[key]
def set_setting(key, value):
"""Set setting and update dictionary"""
sublime_haskell_settings[key] = value
get_settings().set(key, value)
def call_ghcmod_and_wait(arg_list, filename=None):
"""
Calls ghc-mod with the given arguments.
Shows a sublime error message if ghc-mod is not available.
"""
ghc_cwd = (get_cabal_project_dir_of_file(filename) or os.path.dirname(filename)) if filename else None
try:
command = try_attach_sandbox(['ghc-mod'] + arg_list)
log('running ghc-mod: {0}'.format(command))
exit_code, out, err = call_and_wait(command, cwd=(ghc_cwd or os.getcwd()))
if exit_code != 0:
raise Exception("ghc-mod exited with status %d and stderr: %s" % (exit_code, err))
return out
except OSError, e:
if e.errno == errno.ENOENT:
output_error(sublime.active_window(),
"SublimeHaskell: ghc-mod was not found!\n"
+ "It is used for LANGUAGE and import autocompletions and type inference.\n"
+ "Try adjusting the 'add_to_PATH' setting.\n"
+ "You can also turn this off using the 'enable_ghc_mod' setting.")
def wait_for_window_callback(on_appear, seconds_to_wait):
window = sublime.active_window()
if window:
on_appear(window)
return
if seconds_to_wait == 0:
return
sublime.set_timeout(lambda: wait_for_window_callback(on_appear, seconds_to_wait - 1), 1000)
def wait_for_window(on_appear, seconds_to_wait=MAX_WAIT_FOR_WINDOW):
"""
Wait for window to appear on startup
It's dirty hack, but I have no idea how to make it better
"""
sublime.set_timeout(lambda: wait_for_window_callback(on_appear, seconds_to_wait), 0)
def output_error(window, text):
"Write text to Sublime's output panel with important information about SublimeHaskell error during load"
output_view = window.get_output_panel(SUBLIME_ERROR_PANEL_NAME)
output_view.set_read_only(False)
edit = output_view.begin_edit()
output_view.insert(edit, 0, text)
output_view.end_edit(edit)
output_view.set_read_only(True)
window.run_command('show_panel', {'panel': 'output.' + SUBLIME_ERROR_PANEL_NAME})
class SublimeHaskellError(RuntimeError):
def __init__(self, what):
self.reason = what
def sublime_status_message(msg):
"""
Pure msg with 'SublimeHaskell' prefix and set_timeout
"""
sublime.set_timeout(lambda: sublime.status_message(u'SublimeHaskell: {0}'.format(msg)), 0)
def show_status_message(msg, isok = None):
"""
Show status message with check mark (isok = true), ballot x (isok = false) or ... (isok = None)
"""
mark = u'...'
if isok is not None:
mark = u' \u2714' if isok else u' \u2718'
sublime_status_message(u'{0}{1}'.format(msg, mark))
def with_status_message(msg, action):
"""
Show status message for action with check mark or with ballot x
Returns whether action exited properly
"""
try:
show_status_message(msg)
action()
show_status_message(msg, True)
return True
except SublimeHaskellError as e:
show_status_message(msg, False)
log(e.reason)
return False
def crlf2lf(s):
" CRLF -> LF "
if not s:
return None
return s.replace('\r\n', '\n')
class StatusMessage(threading.Thread):
def __init__(self, msg):
super(StatusMessage, self).__init__()
self.interval = 0.5
self.msg = msg
self.times = 0
self.event = threading.Event()
self.event.set()
self.timer = None
def run(self):
self.update_message()
while self.event.is_set():
self.timer = threading.Timer(self.interval, self.update_message)
self.timer.start()
self.timer.join()
def cancel(self):
self.event.clear()
if self.timer:
self.timer.cancel()
def update_message(self):
dots = self.times % 4
self.times += 1
sublime_status_message(u'{0}{1}'.format(self.msg, '.' * dots))
status_messager = None
def show_status_message_process(msg, isok = None):
"""
Same as show_status_message, but shows permanently until called with isok not None
"""
global status_messager
if isok is not None:
if status_messager:
status_messager.cancel()
show_status_message(msg, isok)
else:
if status_messager:
status_messager.cancel()
status_messager = StatusMessage(msg)
status_messager.start()
def is_haskell_source(view = None):
return is_enabled_haskell_command(view, False)