GTCaca Python bindings

pybind11 bindings for GTCaca, a libcaca-based terminal UI toolkit: windows, widgets, charts, an editor, and a raw canvas escape hatch — all drawn as text cells.

The bindings compile the GTCaca C sources directly into the extension module, so the only external runtime dependency is libcaca itself. Every widget the toolkit ships is exposed.

pip install gtcaca

Requirements · Install
Quick start
Core concepts — lifecycle, parents, focus, callbacks, colours
Widgets
Utilities: Rope
Threading and the GIL
API index

Requirements

A C/C++ toolchain and CMake ≥ 3.20
libcaca with development headers, discoverable via pkg-config (pkg-config --exists caca should succeed)
Python ≥ 3.9

On macOS: brew install libcaca, and if pkg-config cannot find it, export PKG_CONFIG_PATH="$(brew --prefix libcaca)/lib/pkgconfig". On Debian/Ubuntu: apt install libcaca-dev.

Install

pip install gtcaca                 # from PyPI
pip install .                      # from a checkout of src/bindings/python

Building in-tree without installing:

cmake -S . -B build -Dpybind11_DIR="$(python -m pybind11 --cmakedir)"
cmake --build build -j

Quick start

import gtcaca as gt

gt.init()
gt.application_new("Hello")
win = gt.window_new(None, "Demo", 0, 1, 40, 10)
gt.label_new(win, "Press Enter on the button", 2, 2)

btn = gt.button_new(win, "  OK  ", 2, 4)

def on_key(key):
    if key == gt.KEY_RETURN:
        gt.main_quit()
    return 0            # 0 = not consumed; let others see the key

btn.on_key(on_key)
win.set_focus()
gt.main()               # blocking event loop
gt.present_shutdown()

See example.py for a fuller program.

Core concepts

Lifecycle

Call	Purpose
`gt.init()`	open the display; must precede any widget creation
`gt.main()`	run the blocking event loop
`gt.main_quit()`	ask the loop to exit (call from a callback)
`gt.redraw()`	repaint now — call after changing state from a callback
`gt.present_shutdown()`	tear the display down
`gt.canvas_width()`, `gt.canvas_height()`	canvas size in character cells

The display driver is chosen by libcaca; CACA_DRIVER=null runs headless, which is what makes the widgets testable without a terminal.

Widgets and parents

Every widget comes from a *_new() factory whose first argument is the parent — another widget, or None for a top-level/canvas-anchored widget:

win  = gt.window_new(None, "Title", 0, 0, 40, 12)
name = gt.entry_new(win, 2, 3, 20)          # lives inside the window

Widgets are owned by the C library and live for the process; they are never freed by Python. Each exposes the shared preamble x, y, width, height, has_focus, is_visible, id, plus show(), hide() and as_widget().

Focus

Keys go to focused widgets. widget.set_focus() (windows/custom) or assigning widget.has_focus = True moves it; window.focus_next_child() cycles.

Callbacks

Key callbacks — widget.on_key(cb), cb(key: int) -> int. Return non-zero to consume the key; returning None means not consumed.
Value callbacks — on_toggle(cb) / on_change(cb) on Switch, Expander, Scale, SpinButton. Receive the new value.
Menu actions take no arguments.
Mouse — Custom.on_mouse(cb), cb(event, x, y, button).

Exceptions inside a callback are reported through sys.unraisablehook and never abort the event loop.

Colours

ANSI colour constants are module attributes: gt.BLACK, gt.RED, gt.GREEN, gt.BROWN, gt.BLUE, gt.MAGENTA, gt.CYAN, gt.LIGHTGRAY, gt.DARKGRAY, gt.LIGHTRED, gt.LIGHTGREEN, gt.YELLOW, gt.LIGHTBLUE, gt.LIGHTMAGENTA, gt.LIGHTCYAN, gt.WHITE. gt.color_name(idx) gives the display name.

Drawing primitives: gt.set_color(fg, bg), gt.set_color_rgb(fg12, bg12) (12-bit 0xRGB), gt.put_str(x, y, s), gt.put_char(x, y, codepoint), gt.fill_box(x, y, w, h, ch), gt.draw_box(...), gt.draw_thin_box(...).

Windows and layout

app = gt.application_new("My app")
win = gt.window_new(None, "Settings", 0, 1, 50, 16)
win2 = gt.window_new_centered(None, "Centered", 30, 8)

gt.frame_new(win, "Network", 2, 2, 44, 6)      # labelled box
gt.separator_new(win, 2, 9, 44)                # horizontal rule

Box layouts

A Box positions widgets; it draws nothing itself.

box = gt.vbox_new()                 # or gt.hbox_new() / gt.box_new(gt.BOX_HORIZONTAL)
box.set_spacing(1)
box.set_margin(1)
box.set_align(gt.ALIGN_CENTER)      # ALIGN_START / ALIGN_CENTER / ALIGN_END

box.add(gt.label_new(None, "Name", 0, 0))
box.add_expand(gt.entry_new(None, 0, 0, 20))   # takes leftover space
box.add_spacing(2)
box.add_stretch()

box.apply(0, 0, 40, 12)             # lay out into this rectangle
box.apply_window(win)               # ...or into a window's content area
print(box.preferred_width(), box.preferred_height())

Tabs and expanders

tabs = gt.tabs_new(win, 1, 1, 40, 12)
tabs.set_titles(["General", "Advanced"])
tabs.set_selected(1)
print(tabs.selected())              # 1
tabs.key(gt.KEY_RIGHT)              # feed it keys yourself

exp = gt.expander_new(win, "Details", 2, 14, 30)
exp.add_managed(some_widget)        # shown/hidden with the expander
exp.set_expanded(True)
exp.on_toggle(lambda expanded: print("open" if expanded else "closed"))

Buttons and input

btn = gt.button_new(win, "  Apply  ", 2, 2)
btn.on_key(lambda k: gt.main_quit() if k == gt.KEY_RETURN else 0)

chk = gt.checkbox_new(win, "Enable", 2, 4)
chk.set_checked(True); chk.get_checked()

r1 = gt.radiobutton_new(win, "Fast", 1, 2, 6)   # group id 1
r2 = gt.radiobutton_new(win, "Small", 1, 2, 7)
r1.set_active()                  # takes no argument: selects r1, clears the group
r2.get_active()                  # -> False

cb = gt.combobox_new(win, 2, 9, 20)
cb.append("gzip"); cb.append("zstd")
cb.get_selected(); cb.get_selected_index()

sw = gt.switch_new(win, 2, 11)
sw.set_active(True); sw.get_active()
sw.on_toggle(lambda active: print("switch:", active))

sb = gt.spinbutton_new(win, 2, 13, 0, 100, 5)   # min, max, step
sb.set_value(20); sb.get_value()
sb.on_change(lambda v: print("spin:", v))
sb.handle_key(gt.KEY_UP)

sc = gt.scale_new(win, 2, 15, 30, 0.0, 1.0, 0.05)   # a slider
sc.set_value(0.4); sc.get_value()
sc.on_change(lambda v: print("scale:", v))

Text

Label, Entry, TextView

gt.label_new(win, "Read only text", 2, 2)

e = gt.entry_new(win, 2, 4, 24)
e.set_text("hello"); e.get_text()
e.set_secret(True)                 # password field

tv = gt.textview_new(win, 2, 6, 40, 8)
tv.append("a log line")
tv.clear()

TextList — a scrollable, searchable list

tl = gt.textlist_new(win, 2, 2)
tl.set_view_size(10)
for name in ("alpha", "beta", "gamma"):
    tl.append(name)
tl.set_search_enabled(True)
tl.selection_down()
print(tl.selected_text(), tl.is_searching())
tl.on_key(lambda k: 0)

Editor — a multi-line text editor

A Scintilla-shaped API: positions are byte offsets, lines are 0-based.

ed = gt.editor_new(win, 0, 1, 80, 20)
ed.set_text("def f():\n    return 1\n")
ed.set_line_numbers(True)
ed.set_tab_width(4)
ed.set_caret_line_visible(True)

# navigation and selection
ed.goto_line(1); ed.line_end_extend()
print(ed.selected_text(), ed.current_line(), ed.line_count())

# editing with grouped undo
ed.begin_undo_action()
ed.insert_text(0, "# header\n")
ed.end_undo_action()
ed.undo(); ed.redo()
print(ed.can_undo(), ed.get_modify())

# search
hit = ed.find_text(0, "return", 0, len(ed))     # -> (start, end) or None
ed.set_target_range(0, len(ed))
if ed.search_in_target("return") >= 0:
    ed.replace_target("yield")

# syntax configuration
cfg = gt.editor_langcfg_new()
cfg.set_line_comment("#")
cfg.set_block_comment('"""', '"""')
cfg.add_bracket("(", ")")
cfg.set_keywords(["def", "class", "return"])
ed.set_langcfg(cfg)
ed.colourize()

# folding and annotations
ed.fold_by_indentation()
ed.toggle_fold(0)
ed.annotation_set_text(1, "returns an int")

Also available: rectangular selection (set_rectangular_selection, rect_copy, rect_yank, …), word motion (word_left, del_word_right, …), styling (style_set_fore, style_set_bold, set_bg_rgb12, …), set_read_only, set_overtype, set_wrap, set_view_whitespace, brace_match, and JSON mode (set_json_mode, fold_json).

Data views

Table — a lazy model/view

Rows live behind a model: any object with these methods. Only visible rows are queried, so the row count may be huge.

class FileModel:
    def __init__(self, rows): self.rows = rows
    def row_count(self):      return len(self.rows)
    def col_count(self):      return 2
    def header(self, col):    return ("Name", "Size")[col]
    def cell(self, row, col): return str(self.rows[row][col])
    # optional — Wireshark-style row colouring; None = theme default
    def row_color(self, row):
        return (gt.BLACK, gt.YELLOW) if self.rows[row][1] > 1_000_000 else None

t = gt.table_new(win, 0, 1, 60, 20)
t.set_model(FileModel([("a.txt", 12), ("big.iso", 4_000_000)]))
t.set_column_widths([30, 12])
t.set_title("Files")
t.key(gt.KEY_DOWN)
print(t.current_row(), t.current_col(), t.selected_row())

Tree — a lazy hierarchical view

Nodes are integers you choose; the invisible super-root is None.

NODES = {1: ("root", [2, 3]), 2: ("child A", []), 3: ("child B", [4]), 4: ("leaf", [])}

class TreeModel:
    def child_count(self, node):  return len(NODES[node][1]) if node else 1
    def child(self, node, i):     return NODES[node][1][i] if node else 1
    def label(self, node):        return NODES[node][0]
    def has_children(self, node): return bool(NODES[node][1]) if node else True
    # optional: paint the row yourself instead of using label()
    # def draw_row(self, node, x, y, width, selected): ...

tr = gt.tree_new(win, 0, 1, 40, 20)
tr.set_model(TreeModel())
tr.select(3)
print(tr.selected_node(), tr.visible_count())

HexView — byte viewer and editor

As a viewer:

hv = gt.hexview_new(win, 0, 1, 78, 20)
data = open("file.bin", "rb").read()
hv.set_data(data)            # keep `data` alive: the widget does not copy it
hv.set_highlight(16, 8)      # one reverse-video range
hv.set_title("file.bin")
hv.key(gt.KEY_DOWN)          # arrows/page/home/end move, TAB swaps panes
print(hv.cursor(), len(hv))

Layout — every dimension is adjustable:

hv.set_bytes_per_row(0)      # 0 = fit as many as the width allows
hv.bytes_per_row()           # the effective value
hv.set_group_size(4)         # blank column every 4 bytes (0 = no grouping)
hv.set_addr_digits(8)        # 0 = derive from the data length
hv.set_base_addr(0x400000)   # show file offsets as load addresses
hv.set_show_ascii(False)     # hex only
hv.set_box(False)            # borderless, for a full-width pane

Colouring — one hook, called for every painted byte (twice: hex cell and ASCII cell). Returning None falls through to the widget's own colouring, which is cursor → selection → tags → highlight range.

def cell(off, is_ascii):
    if off in bookmarks:
        return (0x000, 0xF66)          # 12-bit 0xRGB
    return None

hv.on_cell(cell)
hv.on_cell(None)                       # remove

Named coloured regions, for bookmarks or parsed fields — later tags paint over earlier ones:

hv.add_tag(0, 8, 0xFFF, 0x006, "header")
hv.add_tag(4, 2, 0x000, 0x0F0, "length")
print(hv.tag_at(4))                    # "length"
hv.clear_tags()

Cursor and selection:

hv.set_cursor(0x100); hv.cursor()
hv.set_pane(True); hv.pane()           # True = ASCII pane
hv.set_nibble(True); hv.nibble()       # which half-byte is being typed
hv.set_selection(10, 40); hv.selection()   # -> (10, 40) inclusive
hv.clear_selection()

Editing. The widget never mutates the bytes. It reports the intended change and your code applies it — which is what lets an application keep its own undo history, layers, or a memory-mapped file behind the view:

buf = bytearray(open("file.bin", "rb").read())

def on_edit(off, value):        # a byte was typed over
    buf[off] = value
    return True                 # False rejects it; the cursor does not advance

def on_splice(off, is_insert):  # one byte inserted or deleted
    buf.insert(off, 0) if is_insert else buf.pop(off)
    hv.set_data(buf)            # re-point: the buffer may have moved
    return True

hv.set_editable(True)
hv.on_edit(on_edit)
hv.on_splice(on_splice)
hv.set_insert_mode(True)        # INSERT toggles it too

Once editable, key() also handles hex digits (two nibbles per byte), printable ASCII in the ASCII pane, DELETE, BACKSPACE and INSERT.

Large data. Instead of a flat buffer, serve bytes on demand — for files bigger than memory, a remote target, or a stream decompressed as you scroll:

fh = open("huge.iso", "rb")
def read(off, n):
    fh.seek(off)
    return fh.read(n)

hv.on_read(read, os.path.getsize("huge.iso"))    # replaces set_data()

Search:

hv.find(b"\x89PNG")                       # -> offset, or -1
hv.find(b"PNG", from_offset=100)
hv.find(b"PNG", from_offset=len(hv), backwards=True)

Indicators

pb = gt.progressbar_new(win, 2, 2, 30); pb.set_value(0.5)

g = gt.gauge_new(win, 2, 4, 30)
g.set_percent(80)                        # or set_value(0.8)
g.set_label("CPU")                       # None shows the percentage
g.set_colors(gt.GREEN, gt.DARKGRAY)

sp = gt.spinner_new(win, 2, 6)
sp.set_spinning(True); sp.step()         # advance one frame

sd = gt.segdisplay_new(win, 2, 8, 30, 6) # seven-segment display
sd.set_text("42.7"); sd.set_colour(gt.LIGHTRED); sd.set_box(True)

sl = gt.sparkline_new(win, 2, 15, 30, 4)
sl.set_data([1.0, 4.0, 2.0, 8.0])
sl.push(5.0)                             # rolling append
sl.set_style(gt.SPARKLINE_AREA)          # or SPARKLINE_BLOCKS / set_style_auto()

bar = gt.statusbar_new(" ready ")
bar.set_text(" saved ")

Charts and maps

bc = gt.barchart_new(win, 0, 1, 40, 12)
bc.set_data([3.0, 7.0, 5.0], ["red", "green", "blue"])
bc.set_show_values(True); bc.set_bar_width(3, 1); bc.set_max(0)   # 0 = auto

pc = gt.piechart_new(win, 0, 1, 40, 14)
pc.set_data([30.0, 50.0, 20.0], ["a", "b", "c"])
pc.set_colors([gt.RED, gt.GREEN, gt.BLUE])
pc.set_donut(True); pc.set_show_legend(True)
gt.piechart_palette(0)                      # default palette entry

lc = gt.linechart_new(win, 0, 1, 60, 16)
lc.add_series([1.0, 3.0, 2.0, 5.0], gt.LIGHTGREEN)
lc.set_range(0, 6); lc.set_xspan(10, "s"); lc.set_log_y(False)

sp = gt.scatter_new(win, 0, 1, 60, 16)
sp.add_point(1.0, 2.0, gt.CYAN)
sp.set_data([1.0, 2.0, 3.0], [2.0, 4.0, 8.0], gt.YELLOW)
sp.set_autoscale(True)                      # or set_bounds(xmin, xmax, ymin, ymax)

Map

m = gt.map_new(win, 0, 1, 80, 24)
m.add_world(gt.BLUE)
m.set_graticule(True)
m.add_city("Paris", colour=gt.LIGHTRED)     # built-in city table
m.add_point(35.68, 139.69, label="Tokyo", colour=gt.YELLOW)
m.add_polyline([2.35, 48.85, 139.69, 35.68], gt.GREEN)   # flat lon,lat,lon,lat
print(m.project(2.35, 48.85))               # -> (x, y) or None if off-map
print(gt.map_find_city("Tokyo"))            # ('Tokyo', 35.68, 139.69)
print(len(gt.map_cities()))

MindMap

mm = gt.mindmap_new(win, 0, 1, 60, 20)
mm.clear("Project")
root = mm.root()
a = mm.add_child(root, "design")
mm.add_sibling(a, "build")
a.set_text("design docs")
a.toggle_fold()
mm.select(a)
print(mm.selected())

Menus

The library binds F10 to toggle menu focus and gives the menu exclusive key dispatch while it is open; it closes a dropdown before running the action, so an action may safely open a modal dialog.

menu = gt.menu_new()

f = menu.add_entry("File")
menu.add_item(f, "Save", "Ctrl-S", lambda: save())
menu.add_item(f, "Save As...", "", lambda: save_as())
menu.add_separator(f)
menu.add_item(f, "Quit", "Ctrl-X", gt.main_quit)

h = menu.add_entry("Help")
menu.add_item(h, "About", "", lambda: gt.dialog_message("About", "v1.0"))

menu.set_focus(True)             # open it from your own key handler
menu.is_focused()
menu.set_item_enabled(f, 0, False)   # grey out File▸Save

Limits: 8 top-level entries, 20 items each, 31-character labels, 11-character shortcut strings.

Dialogs and choosers

The blocking helpers run their own event loop and return the answer, so they can be called straight from a key handler or a menu action.

if gt.dialog_confirm("Unsaved changes", "Quit anyway?"):
    gt.main_quit()

gt.dialog_message("Done", "Export finished.")

idx = gt.dialog_run("Conflict", "The file changed on disk.",
                    ["Reload", "Overwrite", "Cancel"])   # index, or -1 if ESC

For a non-blocking dialog driven by your own loop, use the widget form: gt.dialog_new(...), .set(title, message, buttons), .draw(), .key(k), .result() (which is gt.DIALOG_ONGOING until a button is chosen).

File chooser

path = gt.filechooser_run(".", save_mode=False)      # -> path or None
path = gt.filechooser_run_named(".", "untitled.txt") # save dialog, name pre-filled

path, flags = gt.filechooser_run_opts(".", True, [("compress", True), ("backup", False)])

Or embed it: gt.filechooser_new(parent, x, y, w, h), .set_dir(), .draw(), .key().

Colour picker and calendar

colour = gt.colordialog_run("Pick a colour", gt.RED)   # ANSI index, or -1

cal = gt.calendar_new(win, 0, 1, 24, 10)
cal.set_date(2026, 8, 3)
cal.set_marker(lambda y, m, d: d in (1, 15))           # mark those days
print(cal.get_date())
gt.calendar_days_in_month(2026, 2)    # 28
gt.calendar_day_of_week(2026, 8, 3)   # 0=Sunday .. 6=Saturday

Image

img = gt.image_new(win, 0, 1, 40, 20)
if img.load("photo.png"):             # also load_memory(bytes)
    img.draw()

Custom widgets

When no stock widget fits, take the canvas. This is how you get per-cell colour.

def draw():
    W, H = gt.canvas_width(), gt.canvas_height()
    gt.set_color(gt.WHITE, gt.BLUE)
    gt.fill_box(0, 0, W, 1, ord(" "))
    gt.put_str(1, 0, "custom widget")
    gt.set_color_rgb(0x9CF, 0x000)       # 12-bit RGB
    gt.put_str(1, 2, "coloured text")

def key(k):
    if k == 24:                          # Ctrl-X
        gt.main_quit()
    return 1

def mouse(event, x, y, button):
    if event == gt.MOUSE_PRESS:
        print("click", x, y, button)
    return 0

w = gt.custom_new(None, 0, 0, gt.canvas_width(), gt.canvas_height())
w.on_draw(draw)
w.on_key(key)
w.on_mouse(mouse)
w.set_focusable(True)
w.set_focus()

Mouse events are MOUSE_PRESS, MOUSE_RELEASE, MOUSE_MOTION, MOUSE_WHEEL, MOUSE_DOUBLE; buttons are 1 left, 2 middle, 3 right, 4/5 wheel. gt.set_double_click_time(ms) tunes double-click detection. Motion only arrives while a button is held, and the press that starts a drag owns the whole gesture.

Utilities

Rope — a text buffer with cheap edits anywhere

r = gt.rope_from("hello world")
r.insert(5, ",")
r.delete(0, 1)
print(str(r), len(r), r.lines())
print(r.copy(0, 4), r.at(0))
print(r.line_of(3), r.line_start(0))
print(r.find(0, "w"), r.rfind(len(r), "o"))

Threading and the GIL

The GIL is released while gt.main() blocks and re-acquired inside every callback, so callbacks can safely touch Python state. The modal dialog helpers (dialog_run, dialog_confirm, filechooser_run, colordialog_run) hold the GIL for their duration because their internal redraws call back into Python.

API index

Lifecycle & canvas — init, main, main_quit, redraw, present_shutdown, canvas_width, canvas_height, set_double_click_time

Drawing — set_color, set_color_rgb, put_str, put_char, fill_box, draw_box, draw_thin_box, color_name

Containers — application_new, window_new, window_new_centered, frame_new, separator_new, vbox_new, hbox_new, box_new, tabs_new, expander_new

Input — button_new, entry_new, checkbox_new, radiobutton_new, combobox_new, switch_new, spinbutton_new, scale_new

Text — label_new, textview_new, textlist_new, editor_new, editor_langcfg_new, editor_grammar_load, rope_new, rope_from

Data views — table_new, tree_new, hexview_new

Indicators — progressbar_new, gauge_new, spinner_new, segdisplay_new, sparkline_new, statusbar_new

Charts — barchart_new, piechart_new, piechart_palette, linechart_new, scatter_new, map_new, map_cities, map_find_city, mindmap_new

Menus & dialogs — menu_new, dialog_new, dialog_run, dialog_confirm, dialog_message, filechooser_new, filechooser_run, filechooser_run_named, filechooser_run_opts, colordialog_new, colordialog_run, calendar_new, calendar_days_in_month, calendar_day_of_week, image_new

Escape hatch — custom_new

Constants — colours (BLACK … WHITE), keys (KEY_RETURN, KEY_ESCAPE, KEY_TAB, KEY_UP/DOWN/LEFT/RIGHT, KEY_HOME, KEY_END, KEY_PAGEUP, KEY_PAGEDOWN, KEY_BACKSPACE, KEY_DELETE, KEY_F1–KEY_F10), mouse (MOUSE_PRESS, MOUSE_RELEASE, MOUSE_MOTION, MOUSE_WHEEL, MOUSE_DOUBLE), layout (BOX_VERTICAL, BOX_HORIZONTAL, ALIGN_START, ALIGN_CENTER, ALIGN_END), SPARKLINE_BLOCKS, SPARKLINE_AREA, DIALOG_ONGOING

Every binding lives in gtcaca_module.cpp; help(gtcaca) and help(gtcaca.Editor) work at the REPL for per-method signatures.

Licence

Public domain, like GTCaca itself.

Development Status
- 3 - Alpha
Environment
- Console :: Curses
License
- Public Domain
Operating System
- MacOS :: MacOS X
- POSIX :: Linux
Programming Language
- C
- Python :: 3
Topic
- Software Development :: User Interfaces

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gtcaca 0.1.31

GTCaca Python bindings

Contents

Requirements

Install

Quick start

Core concepts

Lifecycle

Widgets and parents

Focus

Callbacks

Colours

Windows and layout

Box layouts

Tabs and expanders

Buttons and input

Text

Label, Entry, TextView

TextList — a scrollable, searchable list

Editor — a multi-line text editor

Data views

Table — a lazy model/view

Tree — a lazy hierarchical view

HexView — byte viewer and editor

Indicators

Charts and maps

Map

MindMap

Menus

Dialogs and choosers

File chooser

Colour picker and calendar

Image

Custom widgets

Utilities

Rope — a text buffer with cheap edits anywhere

Threading and the GIL

API index

Licence

Project links

Key dates

1 maintainer

Credits

GitHub Statistics

License

Requires

Tags

Classifiers

Download files

Source Distribution

Built Distributions

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