187 lines
6.4 KiB
Python
Executable File
187 lines
6.4 KiB
Python
Executable File
#
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# Author: Mahmoud Bassiouny <mbassiouny@vmware.com>
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import curses
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from actionresult import ActionResult
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from action import Action
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class TextPane(Action):
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def __init__(self, starty, maxx, width, text_file_path, height, menu_items):
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self.head_position = 0 #This is the start of showing
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self.menu_position = 0
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self.lines = []
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self.menu_items = menu_items
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self.width = width
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self.read_file(text_file_path, self.width - 3)
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self.num_items = len(self.lines)
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self.text_height = height - 2
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# Check if we need to add a scroll bar
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if self.num_items > self.text_height:
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self.show_scroll = True
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else:
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self.show_scroll = False
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# Some calculation to detitmine the size of the scroll filled portion
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if self.num_items == 0:
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self.filled = 0
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else:
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self.filled = int(round(self.text_height * self.text_height / float(self.num_items)))
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if self.filled == 0:
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self.filled += 1
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for i in [1, 2]:
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if ((self.num_items - self.text_height) >= i and
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(self.text_height - self.filled) == (i - 1)):
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self.filled -= 1
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self.window = curses.newwin(height, self.width)
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self.window.bkgd(' ', curses.color_pair(2))
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self.popupWindow = False
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self.window.keypad(1)
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self.panel = curses.panel.new_panel(self.window)
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self.panel.move(starty, (maxx - self.width) // 2)
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self.panel.hide()
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curses.panel.update_panels()
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def read_file(self, text_file_path, line_width):
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with open(text_file_path, "rb") as f:
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for line in f:
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# expand tab to 8 spaces.
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try:
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line = line.decode(encoding='latin1')
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except UnicodeDecodeError:
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pass
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line = line.expandtabs()
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indent = len(line) - len(line.lstrip())
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actual_line_width = line_width - indent
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line = line.strip()
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# Adjust the words on the lines
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while len(line) > actual_line_width:
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sep_index = actual_line_width
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while sep_index > 0 and line[sep_index-1] != ' ' and line[sep_index] != ' ':
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sep_index = sep_index - 1
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current_line_width = sep_index
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if sep_index == 0:
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current_line_width = actual_line_width
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currLine = line[:current_line_width]
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line = line[current_line_width:]
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line = line.strip()
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# Lengthen the line with spaces
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self.lines.append(' ' * indent + currLine +
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' ' *(actual_line_width - len(currLine)))
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# lengthen the line with spaces
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self.lines.append(' ' * indent + line + ' ' *(actual_line_width - len(line)))
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def navigate(self, n):
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if self.show_scroll:
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self.head_position += n
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if self.head_position < 0:
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self.head_position = 0
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elif self.head_position > (len(self.lines) - self.text_height + 1):
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self.head_position = len(self.lines) - self.text_height + 1
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def navigate_menu(self, n):
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self.menu_position += n
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if self.menu_position < 0:
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self.menu_position = 0
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elif self.menu_position >= len(self.menu_items):
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self.menu_position = len(self.menu_items) - 1
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def render_scroll_bar(self):
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if self.show_scroll:
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remaining_above = self.head_position
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remaining_down = self.num_items - self.text_height - self.head_position#
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up = int(round(remaining_above * self.text_height / float(self.num_items)))
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down = self.text_height - up - self.filled
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if up == 0 and remaining_above > 0:
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up += 1
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down -= 1
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if down == 0 and remaining_down > 0:
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up -= 1
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down += 1
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if remaining_down == 0 and down != 0:
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up += down
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down = 0
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for index in range(up):
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self.window.addch(index, self.width - 2, curses.ACS_CKBOARD)
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for index in range(self.filled):
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self.window.addstr(index + up, self.width - 2, ' ', curses.A_REVERSE)
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for index in range(down):
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self.window.addch(index + up + self.filled, self.width - 2, curses.ACS_CKBOARD)
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def refresh(self):
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self.window.erase()
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for index, line in enumerate(self.lines):
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if index < self.head_position:
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continue
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elif index > self.head_position + self.text_height - 1:
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continue
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x = 0
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y = index - self.head_position
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if len(line) > 0:
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self.window.addstr(y, x, line)
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xpos = self.width
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for index, item in enumerate(self.menu_items):
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if index == self.menu_position:
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mode = curses.color_pair(3)
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else:
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mode = curses.color_pair(2)
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self.window.addstr(self.text_height + 1, xpos - len(item[0]) - 4, item[0], mode)
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xpos = xpos - len(item[0]) - 4
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self.render_scroll_bar()
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self.window.refresh()
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self.panel.top()
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self.panel.show()
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curses.panel.update_panels()
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curses.doupdate()
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def hide(self):
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self.panel.hide()
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curses.panel.update_panels()
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curses.doupdate()
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def do_action(self):
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while True:
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self.refresh()
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key = self.window.getch()
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if key in [curses.KEY_ENTER, ord('\n')]:
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self.hide()
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return self.menu_items[self.menu_position][1]()
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if key == curses.KEY_UP:
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self.navigate(-1)
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elif key == curses.KEY_DOWN:
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self.navigate(1)
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elif key == curses.KEY_LEFT:
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self.navigate_menu(1)
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elif key == curses.KEY_RIGHT:
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self.navigate_menu(-1)
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elif key == curses.KEY_NPAGE:
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self.navigate(self.text_height)
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elif key == curses.KEY_PPAGE:
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self.navigate(-self.text_height)
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elif key == curses.KEY_HOME:
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self.head_position = 0
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