├── .flake8 ├── .gitignore ├── LICENSE ├── README.rst ├── screenshot.png ├── viter-pager └── viter.py /.flake8: -------------------------------------------------------------------------------- 1 | [flake8] 2 | max-line-length = 88 3 | ignore = E203, W503 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | tags 2 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | .. image:: screenshot.png 2 | 3 | Viter is a terminal emulator written and expandable in Python. 4 | It features Vim-like modes, key bindings, and status line and can act like a pager. 5 | 6 | .. contents:: Navigation: 7 | :backlinks: none 8 | 9 | ============ 10 | Installation 11 | ============ 12 | 13 | ~~~ 14 | AUR 15 | ~~~ 16 | 17 | Install the ``viter-git`` `AUR package`_. 18 | 19 | ~~~~~~~~~~~~~~~~~~~ 20 | Manual installation 21 | ~~~~~~~~~~~~~~~~~~~ 22 | 23 | Viter requires VTE and PyGObject. They are packaged as ``python-gobject`` and ``vte3`` on 24 | Arch. Look for similarly named packages if you use another GNU/Linux distribution. 25 | 26 | ===== 27 | Usage 28 | ===== 29 | 30 | Run ``viter`` to launch the default shell in Viter. Run ``viter program [args]`` to launch 31 | ``program`` in Viter with ``[args]`` (may be empty). Substitute ``viter`` for 32 | ``/path/to/this/repo/viter.py`` if you didn't use AUR to install Viter. 33 | 34 | Viter starts up in **NORMAL** mode where it behaves just like any other terminal emulator. 35 | Press ``Ctrl+Shift+Space`` to switch to **DETACHED** mode and access most of the features 36 | (see `Key bindings`_ and `Command interpreter`_). Press ``Escape`` to return to **NORMAL** 37 | mode. 38 | 39 | =========== 40 | Key bindings 41 | =========== 42 | 43 | * Switching modes: 44 | 45 | * ``Escape``: switch to **NORMAL** mode 46 | * ``Ctrl+Shift+Space``: switch to **DETACHED** mode 47 | 48 | * Navigating the scrollback 49 | 50 | * ``j``: one line down 51 | * ``k``: one line up 52 | * ``J``: half page down 53 | * ``K``: half page up 54 | * ``g``: to the beginning 55 | * ``G``: to the end 56 | 57 | * Zooming 58 | 59 | * ``+``/``=``: make the font 25% larger 60 | * ``-``: make the font 25% smaller 61 | 62 | * Search 63 | 64 | * ``/`` *pattern* ``Enter``: set the search pattern to *pattern* 65 | * ``n``: to the next occurrence of the search pattern 66 | * ``N``: to the previous occurrence of the search pattern 67 | 68 | * Clipboard 69 | 70 | * ``c``: copy selected text 71 | * ``y`` *characters* ``Enter``: 72 | yank the first line that starts with *characters* (not counting whitespace) 73 | * ``v`` *characters* ``",`` *count* ``Enter``: 74 | yank the block of *count* lines, where the first line starts with *characters* 75 | (not counting whitespace) 76 | * ``V``: yank the whole window 77 | * ``Y``: yank the message in the bar 78 | * ``p``: paste 79 | * ``Ctrl+Shift+C``/``Ctrl+Shift+V``: copy/paste in **NORMAL** mode 80 | 81 | * Command line 82 | 83 | * ``:`` *command* ``Enter``: 84 | execute *command* in the Python environment that executes the code of Viter 85 | * ``e`` *expression* ``Enter``: evaluate *expression* and print the result in the bar 86 | 87 | =================== 88 | Command interpreter 89 | =================== 90 | 91 | A status bar at the bottom of the window is shown when the user is in **DETACHED** mode. 92 | It displays data in the format of 93 | `` [TopLineNum-BottomLineNum] (TotalLines) |TerminalHeightxTerminalWidth|`` while 94 | being unfocused. 95 | 96 | After the user typed some text into it and pressed ``Enter``, the entered text is 97 | executed by Viter using ``exec`` (a Python built-in). 98 | 99 | Use the ``win`` global variable to interact with the window. Some key bindings insert a 100 | call to one of the methods of ``win``, for example: 101 | 102 | * ``/`` inserts ``win.search("")`` and places the cursor between "". 103 | * ``y`` inserts ``win.yank_line("")`` and places the cursor between "". 104 | * ``e`` inserts ``win.echo()`` and places the cursor between (). 105 | 106 | ``win`` is an instance of the ``Window`` class that inherits ``Gtk.Window``. 107 | Calls to the inherited methods are also valid, for example: 108 | 109 | * ``win.set_title("Terminal")`` to set the title of the window to *Terminal*. 110 | * ``win.close()`` to close the window. 111 | * ``win.fullscreen()`` to make the window fullscreen. 112 | 113 | ``win`` has the ``term`` field of type ``Vte.Terminal``. See the Gtk documentation on 114 | ``Gtk.Window`` `[1]`_ and ``Vte.Terminal`` `[2]`_ for the full list of the methods and 115 | fields. See the source of Viter to see the methods that are provided additionally to that 116 | of ``Gtk.Window``. 117 | 118 | ========== 119 | Pager mode 120 | ========== 121 | 122 | If Viter is invoked as ``viter-pager``, Viter acts like a pager. It starts up directly 123 | into **DETACHED** mode. If there is no arguments, ``stdin`` is read, otherwise the 124 | arguments are interpreted as file names. 125 | 126 | Here are some examples of preprocessing the input: 127 | 128 | * ``pygmentize | viter-pager`` — syntax highlighting. 129 | * ``ul | viter-pager`` — converting overstriking to properly underlined text. 130 | 131 | If you want to use Viter as your ``$MANPAGER``, make sure to cook the input via ``ul``. 132 | The pages will lose formating (underlining, bold text) otherwise. 133 | 134 | ============= 135 | Configuration 136 | ============= 137 | 138 | Viter looks for the configuration file in the following order: 139 | 140 | * ``$VITER_CONFIG`` 141 | * ``$XDG_CONFIG_HOME/viter/viterrc.py`` 142 | * ``$HOME/.config/viter/viterrc.py`` 143 | 144 | The first file that exists is read and then passed to ``exec`` just before Viter enters 145 | the main loop. The file must be a valid Python script. 146 | 147 | See an example of the configuration file here_. 148 | 149 | .. LINKS 150 | .. _AUR package: https://aur.archlinux.org/packages/viter-git/ 151 | .. _[1]: https://lazka.github.io/pgi-docs/Gtk-3.0/classes/Window.html 152 | .. _[2]: https://lazka.github.io/pgi-docs/Vte-2.91/classes/Terminal.html 153 | .. _here: https://github.com/Kharacternyk/dotfiles/blob/master/.config/viter/viterrc.py 154 | .. _Kharacternyk: https://github.com/Kharacternyk 155 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Kharacternyk/viter/c8ca21a8adea4ef3b0922b730216d6443bad2bde/screenshot.png -------------------------------------------------------------------------------- /viter-pager: -------------------------------------------------------------------------------- 1 | ./viter.py -------------------------------------------------------------------------------- /viter.py: -------------------------------------------------------------------------------- 1 | #!/bin/python3 -W ignore 2 | 3 | import sys 4 | import os 5 | import enum 6 | import fileinput 7 | import gi 8 | 9 | gi.require_version("Gtk", "3.0") 10 | gi.require_version("Vte", "2.91") 11 | 12 | from gi.repository import Gtk, Vte, GLib, Gdk # noqa E402 13 | 14 | Mode = enum.Enum("Mode", ["NORMAL", "DETACHED"]) 15 | 16 | 17 | class Window(Gtk.Window): 18 | def __init__(self, argv, is_pager=False): 19 | Gtk.Window.__init__(self, title="viter") 20 | self.connect("delete_event", Gtk.main_quit) 21 | self.connect("key_press_event", self.key_press_handler) 22 | 23 | self.init_term() 24 | self.init_bar() 25 | self.init_layout() 26 | 27 | self.show_all() 28 | 29 | self.bar.hide() 30 | self.set_default_key_map() 31 | self.set_default_bar_segments() 32 | 33 | self.mode = Mode.NORMAL 34 | self.message = "" 35 | self.clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD) 36 | self.connect("size_allocate", lambda a, b: self.update_bar()) 37 | 38 | if is_pager: 39 | self.is_pager = True 40 | self.page(argv) 41 | else: 42 | self.is_pager = False 43 | self.spawn(argv) 44 | 45 | def init_term(self): 46 | self.term = Vte.Terminal() 47 | 48 | self.term.search_set_wrap_around(True) 49 | self.term.connect("eof", lambda a: self.close()) 50 | 51 | self.adjustment = self.term.get_vadjustment() 52 | self.adjustment.connect("changed", lambda a: self.update_bar()) 53 | self.adjustment.connect("value_changed", lambda a: self.update_bar()) 54 | 55 | def init_bar(self): 56 | self.bar = Gtk.Entry() 57 | self.bar.connect("activate", self.command_handler) 58 | self.bar.connect("key_press_event", self.bar_key_press_handler) 59 | self.bar.connect("focus_out_event", self.bar_focus_out_handler) 60 | self.bar.connect("focus_in_event", self.bar_focus_in_handler) 61 | self.bar.set_alignment(1) 62 | 63 | self.bar.override_font(self.term.get_font()) 64 | 65 | def init_layout(self): 66 | self.box = Gtk.VBox() 67 | self.add(self.box) 68 | self.box.pack_start(self.term, True, True, 0) 69 | self.box.pack_start(self.bar, False, True, 0) 70 | 71 | def page(self, argv): 72 | # The terminal doesn't report its scroll position until it's drawn. 73 | # We connect an one-time handler. 74 | def scroll_to_top(*args): 75 | self.scroll_term_to_top() 76 | self.term.disconnect_by_func(scroll_to_top) 77 | 78 | self.term.feed("\r".join(fileinput.input()).encode("utf-8")) 79 | self.enter_detached_mode() 80 | self.enter_normal_mode = lambda: None 81 | self.term.set_cursor_blink_mode(Vte.CursorBlinkMode.OFF) 82 | self.term.connect("draw", scroll_to_top) 83 | 84 | def spawn(self, argv): 85 | try: 86 | self.term.spawn_async( 87 | Vte.PtyFlags.DEFAULT, 88 | None, 89 | argv, 90 | None, 91 | 0, 92 | None, 93 | None, 94 | -1, 95 | ) 96 | except AttributeError: 97 | # See issue #1. 98 | self.term.spawn_sync( 99 | Vte.PtyFlags.DEFAULT, 100 | None, 101 | argv, 102 | None, 103 | GLib.SpawnFlags.DO_NOT_REAP_CHILD, 104 | None, 105 | None, 106 | ) 107 | 108 | def bar_focus_in_handler(self, widget, event): 109 | self.bar.set_alignment(0) 110 | self.message = "" 111 | 112 | def bar_focus_out_handler(self, widget, event): 113 | self.bar.set_alignment(1) 114 | self.bar.set_text("") 115 | self.update_bar() 116 | 117 | def bar_key_press_handler(self, widget, event): 118 | if event.keyval == Gdk.KEY_Escape: 119 | self.term.grab_focus() 120 | return True 121 | if event.keyval == Gdk.KEY_Tab: 122 | self.try_autocomplete() 123 | return True 124 | 125 | def command_handler(self, widget): 126 | command = self.bar.get_text() 127 | try: 128 | exec(command) 129 | except Exception as err: 130 | self.message = str(err) 131 | finally: 132 | self.term.grab_focus() 133 | 134 | def key_press_handler(self, widget, event): 135 | if self.mode == Mode.DETACHED: 136 | if not self.bar.has_focus(): 137 | if event.keyval in self.detached_mode_key_map: 138 | self.detached_mode_key_map[event.keyval]() 139 | self.update_bar() 140 | return True 141 | else: 142 | if event.state & Gdk.ModifierType.SHIFT_MASK > 0: 143 | if ( 144 | event.state & Gdk.ModifierType.CONTROL_MASK > 0 145 | and event.keyval in self.normal_mode_key_map 146 | ): 147 | self.normal_mode_key_map[event.keyval]() 148 | return True 149 | elif ( 150 | event.keyval == Gdk.KEY_space and self.shift_space_remap is not None 151 | ): 152 | event.state, event.keyval = self.shift_space_remap 153 | 154 | def try_autocomplete(self): 155 | command = self.bar.get_text() 156 | 157 | try: 158 | last_dot_index = command.rindex(".") 159 | except ValueError: 160 | return 161 | 162 | obj = command[:last_dot_index] 163 | part = command[last_dot_index + 1 :] 164 | 165 | try: 166 | attributes = dir(eval(obj)) 167 | except NameError: 168 | return 169 | except SyntaxError: 170 | return 171 | 172 | possible_matches = [ 173 | attribute for attribute in attributes if attribute.startswith(part) 174 | ] 175 | 176 | if len(possible_matches) == 1: 177 | self.bar.set_text("") 178 | Gtk.Entry.do_insert_at_cursor(self.bar, obj + "." + possible_matches[-1]) 179 | 180 | def prepare_bar(self, text_left, text_right=""): 181 | self.bar.grab_focus() 182 | Gtk.Entry.do_insert_at_cursor(self.bar, text_left + text_right) 183 | Gtk.Entry.do_move_cursor( 184 | self.bar, Gtk.MovementStep.LOGICAL_POSITIONS, -len(text_right), False 185 | ) 186 | 187 | def set_default_key_map(self): 188 | self.detached_mode_key_map = { 189 | Gdk.KEY_colon: (lambda: self.bar.grab_focus()), 190 | Gdk.KEY_slash: (lambda: self.prepare_bar('win.search("', '")')), 191 | Gdk.KEY_j: (lambda: self.scroll_term(1)), 192 | Gdk.KEY_k: (lambda: self.scroll_term(-1)), 193 | Gdk.KEY_J: (lambda: self.scroll_term(0, 0.5)), 194 | Gdk.KEY_K: (lambda: self.scroll_term(0, -0.5)), 195 | Gdk.KEY_g: (lambda: self.scroll_term_to_top()), 196 | Gdk.KEY_G: (lambda: self.scroll_term_to_bottom()), 197 | Gdk.KEY_V: (lambda: self.yank_all()), 198 | Gdk.KEY_v: (lambda: self.prepare_bar('win.yank_block("', ")")), 199 | Gdk.KEY_y: (lambda: self.prepare_bar('win.yank_line("', '")')), 200 | Gdk.KEY_Y: (lambda: self.yank_message()), 201 | Gdk.KEY_c: (lambda: self.term.copy_clipboard_format(Vte.Format.TEXT)), 202 | Gdk.KEY_p: (lambda: self.term.paste_clipboard()), 203 | Gdk.KEY_Escape: (lambda: self.enter_normal_mode()), 204 | Gdk.KEY_n: (lambda: self.term.search_find_next()), 205 | Gdk.KEY_N: (lambda: self.term.search_find_previous()), 206 | Gdk.KEY_e: (lambda: self.prepare_bar("win.echo(", ")")), 207 | Gdk.KEY_plus: (lambda: self.zoom(0.25)), 208 | Gdk.KEY_equal: (lambda: self.zoom(0.25)), 209 | Gdk.KEY_minus: (lambda: self.zoom(-0.25)), 210 | } 211 | 212 | self.normal_mode_key_map = { 213 | Gdk.KEY_space: (lambda: self.enter_detached_mode()), 214 | Gdk.KEY_C: (lambda: self.term.copy_clipboard_format(Vte.Format.TEXT)), 215 | Gdk.KEY_V: (lambda: self.term.paste_clipboard()), 216 | } 217 | 218 | self.shift_space_remap = None 219 | 220 | def enter_normal_mode(self): 221 | self.bar.hide() 222 | self.scroll_term_to_bottom() 223 | self.mode = Mode.NORMAL 224 | 225 | def enter_detached_mode(self): 226 | self.update_bar() 227 | self.bar.show() 228 | self.mode = Mode.DETACHED 229 | 230 | def scroll_term(self, line_count, page_count=0): 231 | current = self.adjustment.get_value() 232 | desired = current + line_count + page_count * self.adjustment.get_page_size() 233 | self.adjustment.set_value(desired) 234 | 235 | def scroll_term_to_top(self): 236 | self.adjustment.set_value(self.adjustment.get_lower()) 237 | 238 | def scroll_term_to_bottom(self): 239 | self.adjustment.set_value(self.adjustment.get_upper()) 240 | 241 | def set_font(self, font): 242 | self.term.set_font(font) 243 | self.bar.override_font(font) 244 | 245 | def zoom(self, delta): 246 | current = self.term.get_font_scale() 247 | self.term.set_font_scale(current + delta) 248 | 249 | def yank_all(self): 250 | text, attributes = self.term.get_text() 251 | self.clipboard.set_text(text, -1) 252 | 253 | def yank_block(self, trait, count, preserve_identation=True): 254 | text, attributes = self.term.get_text() 255 | search_text = trait.strip() 256 | lines = text.splitlines() 257 | 258 | if not preserve_identation: 259 | lines = [line.strip() for line in lines] 260 | first_line_candidates = [ 261 | num for num, line in enumerate(lines) if line.startswith(search_text) 262 | ] 263 | else: 264 | first_line_candidates = [ 265 | num 266 | for num, line in enumerate(lines) 267 | if line.strip().startswith(search_text) 268 | ] 269 | 270 | if first_line_candidates != []: 271 | first_line_num = first_line_candidates[0] 272 | block = "\n".join(lines[first_line_num : first_line_num + count]) 273 | self.clipboard.set_text(block, -1) 274 | else: 275 | self.message = "no such lines: " + search_text 276 | 277 | def yank_line(self, trait): 278 | self.yank_block(trait, 1, False) 279 | 280 | def yank_message(self): 281 | self.clipboard.set_text(self.message, -1) 282 | 283 | def search(self, pattern, caseless=True): 284 | PCRE2_MULTILINE = 0x00000400 285 | PCRE2_CASELESS = 0x00000008 286 | 287 | if caseless: 288 | flags = PCRE2_MULTILINE | PCRE2_CASELESS 289 | else: 290 | flags = PCRE2_MULTILINE 291 | 292 | regex = Vte.Regex.new_for_search(pattern, len(pattern), flags) 293 | self.term.search_set_regex(regex, 0) 294 | 295 | def set_default_bar_segments(self): 296 | def get_top(): 297 | return int(self.adjustment.get_value()) 298 | 299 | def get_bottom(): 300 | return get_top() + int(self.adjustment.get_page_size()) 301 | 302 | def get_rows(): 303 | return self.term.get_row_count() 304 | 305 | def get_columns(): 306 | return self.term.get_column_count() 307 | 308 | self.bar_segments = [ 309 | (lambda: f"{self.message}"), 310 | (lambda: f"<{self.term.get_font_scale():.0%}>"), 311 | (lambda: f"[{get_top()}-{get_bottom()}]"), 312 | (lambda: f"({int(self.adjustment.get_upper())})"), 313 | (lambda: f"|{get_rows()}x{get_columns()}|"), 314 | ] 315 | 316 | def update_bar(self): 317 | status_string = " ".join([f() for f in self.bar_segments]) 318 | self.bar.set_placeholder_text(status_string) 319 | 320 | def echo(self, obj): 321 | self.message = str(obj) 322 | 323 | 324 | if __name__ == "__main__": 325 | is_pager = os.path.basename(sys.argv[0]) == "viter-pager" 326 | child_argv = sys.argv[1:] 327 | if child_argv == []: 328 | child_argv = [os.environ["SHELL"]] 329 | else: 330 | child_argv.insert(0, "/usr/bin/env") 331 | win = Window(child_argv, is_pager) 332 | 333 | if "VITER_CONFIG" in os.environ: 334 | config_path = os.environ["VITER_CONFIG"] 335 | else: 336 | if "XDG_CONFIG_HOME" in os.environ: 337 | config_dir = os.environ["XDG_CONFIG_HOME"] 338 | else: 339 | config_dir = os.environ["HOME"] + "/.config" 340 | config_path = config_dir + "/viter/viterrc.py" 341 | 342 | if os.path.isfile(config_path): 343 | config_file = open(config_path, "r") 344 | exec(config_file.read()) 345 | config_file.close() 346 | 347 | Gtk.main() 348 | 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