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1133 lines (999 loc) Β· 36.8 KB
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"""Progress indicators for tmuxp CLI.
This module provides a threaded spinner for long-running operations,
using only standard library and ANSI escape sequences.
"""
from __future__ import annotations
import atexit
import collections
import dataclasses
import itertools
import logging
import shutil
import sys
import threading
import time
import typing as t
from tmuxp._internal.colors import ANSI_SEQ_RE, ColorMode, Colors, strip_ansi
logger = logging.getLogger(__name__)
if t.TYPE_CHECKING:
import types
from typing_extensions import Self
# ANSI Escape Sequences
HIDE_CURSOR = "\033[?25l"
SHOW_CURSOR = "\033[?25h"
ERASE_LINE = "\033[2K"
CURSOR_TO_COL0 = "\r"
CURSOR_UP_1 = "\x1b[1A"
SYNC_START = "\x1b[?2026h" # synchronized output: buffer until SYNC_END
SYNC_END = "\x1b[?2026l" # flush β prevents multi-line flicker
# Spinner frames (braille pattern)
SPINNER_FRAMES = "β β β Ήβ Έβ Όβ ΄β ¦β §β β "
BAR_WIDTH = 10 # inner fill character count
DEFAULT_OUTPUT_LINES = 3 # default spinner panel height (lines of script output)
def _visible_len(s: str) -> int:
r"""Return visible length of *s*, ignoring ANSI escapes.
Examples
--------
>>> _visible_len("hello")
5
>>> _visible_len("\033[32mgreen\033[0m")
5
>>> _visible_len("")
0
"""
return len(strip_ansi(s))
def _truncate_visible(text: str, max_visible: int, suffix: str = "...") -> str:
r"""Truncate *text* to *max_visible* visible characters, preserving ANSI sequences.
If the visible length of *text* is already within *max_visible*, it is
returned unchanged. Otherwise the text is cut so that exactly
*max_visible* visible characters remain, a ``\x1b[0m`` reset is appended
(to prevent color bleed), followed by *suffix*.
Parameters
----------
text : str
Input string, possibly containing ANSI escape sequences.
max_visible : int
Maximum number of visible (non-ANSI) characters to keep.
suffix : str
Appended after the reset when truncation occurs. Default ``"..."``.
Returns
-------
str
Truncated string with ANSI sequences intact.
Examples
--------
Plain text truncation:
>>> _truncate_visible("hello world", 5)
'hello\x1b[0m...'
ANSI sequences are preserved whole:
>>> _truncate_visible("\033[32mgreen\033[0m", 3)
'\x1b[32mgre\x1b[0m...'
No truncation needed:
>>> _truncate_visible("short", 10)
'short'
Empty string:
>>> _truncate_visible("", 5)
''
"""
if max_visible <= 0:
return ""
if _visible_len(text) <= max_visible:
return text
result: list[str] = []
visible = 0
i = 0
while i < len(text) and visible < max_visible:
m = ANSI_SEQ_RE.match(text, i)
if m:
result.append(m.group())
i = m.end()
else:
result.append(text[i])
visible += 1
i += 1
return "".join(result) + "\x1b[0m" + suffix
SUCCESS_TEMPLATE = "Loaded workspace: {session} ({workspace_path}) {summary}"
PROGRESS_PRESETS: dict[str, str] = {
"default": "Loading workspace: {session} {bar} {progress} {window}",
"minimal": "Loading workspace: {session} [{window_progress}]",
"window": "Loading workspace: {session} {window_bar} {window_progress_rel}",
"pane": "Loading workspace: {session} {pane_bar} {session_pane_progress}",
"verbose": (
"Loading workspace: {session} [window {window_index} of {window_total}"
" Β· pane {pane_index} of {pane_total}] {window}"
),
}
def render_bar(done: int, total: int, width: int = BAR_WIDTH) -> str:
"""Render a plain-text ASCII progress bar without color.
Parameters
----------
done : int
Completed units.
total : int
Total units. When ``<= 0``, returns ``""``.
width : int
Inner fill character count; default :data:`BAR_WIDTH`.
Returns
-------
str
A bar like ``"ββββββββββ"``.
Returns ``""`` when *total* <= 0 or *width* <= 0.
Examples
--------
>>> render_bar(0, 10)
'ββββββββββ'
>>> render_bar(5, 10)
'ββββββββββ'
>>> render_bar(10, 10)
'ββββββββββ'
>>> render_bar(0, 0)
''
>>> render_bar(3, 10, width=5)
'βββββ'
"""
if total <= 0 or width <= 0:
return ""
filled = min(width, int(done / total * width))
return "β" * filled + "β" * (width - filled)
class _SafeFormatMap(dict): # type: ignore[type-arg]
"""dict subclass that returns ``{key}`` for missing keys in format_map."""
def __missing__(self, key: str) -> str:
return "{" + key + "}"
def resolve_progress_format(fmt: str) -> str:
"""Return the format string for *fmt*, resolving preset names.
If *fmt* is a key in :data:`PROGRESS_PRESETS` the corresponding
format string is returned; otherwise *fmt* is returned as-is.
Examples
--------
>>> resolve_progress_format("minimal") == PROGRESS_PRESETS["minimal"]
True
>>> resolve_progress_format("{session} w{window_progress}")
'{session} w{window_progress}'
>>> resolve_progress_format("unknown-preset")
'unknown-preset'
"""
return PROGRESS_PRESETS.get(fmt, fmt)
@dataclasses.dataclass
class _WindowStatus:
"""State for a single window in the build tree."""
name: str
done: bool = False
pane_num: int | None = None
pane_total: int | None = None
pane_done: int = 0 # panes completed in this window (set on window_done)
class BuildTree:
"""Tracks session/window/pane build state; renders a structural progress tree.
**Template Token Lifecycle**
Each token is first available at the event listed in its column.
``β`` means the value does not change at that phase.
.. list-table::
:header-rows: 1
* - Token
- Pre-``session_created``
- After ``session_created``
- After ``window_started``
- After ``pane_creating``
- After ``window_done``
* - ``{session}``
- ``""``
- session name
- β
- β
- β
* - ``{window}``
- ``""``
- ``""``
- window name
- β
- last window name
* - ``{window_index}``
- ``0``
- ``0``
- N (1-based started count)
- β
- β
* - ``{window_total}``
- ``0``
- total
- β
- β
- β
* - ``{window_progress}``
- ``""``
- ``""``
- ``"N/M"`` when > 0
- β
- β
* - ``{windows_done}``
- ``0``
- ``0``
- ``0``
- ``0``
- increments
* - ``{windows_remaining}``
- ``0``
- total
- total
- total
- decrements
* - ``{window_progress_rel}``
- ``""``
- ``"0/M"``
- ``"0/M"``
- β
- ``"N/M"``
* - ``{pane_index}``
- ``0``
- ``0``
- ``0``
- pane_num
- ``0``
* - ``{pane_total}``
- ``0``
- ``0``
- window's pane total
- β
- window's pane total
* - ``{pane_progress}``
- ``""``
- ``""``
- ``""``
- ``"N/M"``
- ``""``
* - ``{pane_done}``
- ``0``
- ``0``
- ``0``
- pane_num
- pane_total
* - ``{pane_remaining}``
- ``0``
- ``0``
- pane_total
- decrements
- ``0``
* - ``{pane_progress_rel}``
- ``""``
- ``""``
- ``"0/M"``
- ``"N/M"``
- ``"M/M"``
* - ``{progress}``
- ``""``
- ``""``
- ``"N/M win"``
- ``"N/M win Β· P/Q pane"``
- β
* - ``{session_pane_total}``
- ``0``
- total
- β
- β
- β
* - ``{session_panes_done}``
- ``0``
- ``0``
- ``0``
- ``0``
- accumulated
* - ``{session_panes_remaining}``
- ``0``
- total
- total
- total
- decrements
* - ``{session_pane_progress}``
- ``""``
- ``"0/T"``
- β
- β
- ``"N/T"``
* - ``{overall_percent}``
- ``0``
- ``0``
- ``0``
- ``0``
- updates
* - ``{summary}``
- ``""``
- ``""``
- ``""``
- ``""``
- ``"[N win, M panes]"``
* - ``{bar}`` (spinner)
- ``[βββ¦]``
- ``[βββ¦]``
- starts filling
- fractional
- jumps
* - ``{pane_bar}`` (spinner)
- ``""``
- ``[βββ¦]``
- β
- β
- updates
* - ``{window_bar}`` (spinner)
- ``""``
- ``[βββ¦]``
- β
- β
- updates
* - ``{status_icon}`` (spinner)
- ``""``
- ``""``
- ``""``
- ``""``
- ``""``
During ``before_script``: ``{bar}``, ``{pane_bar}``, ``{window_bar}`` show a
marching animation; ``{status_icon}`` = ``βΈ``.
Examples
--------
Empty tree renders nothing:
>>> from tmuxp.cli._colors import ColorMode, Colors
>>> colors = Colors(ColorMode.NEVER)
>>> tree = BuildTree()
>>> tree.render(colors, 80)
[]
After session_created event the header appears:
>>> tree.on_event({"event": "session_created", "name": "my-session"})
>>> tree.render(colors, 80)
['Session']
After window_started and pane_creating:
>>> tree.on_event({"event": "window_started", "name": "editor", "pane_total": 2})
>>> tree.on_event({"event": "pane_creating", "pane_num": 1, "pane_total": 2})
>>> lines = tree.render(colors, 80)
>>> lines[1]
'- editor, pane (1 of 2)'
After window_done the window gets a checkmark:
>>> tree.on_event({"event": "window_done"})
>>> lines = tree.render(colors, 80)
>>> lines[1]
'- β editor'
**Inline status format:**
>>> tree2 = BuildTree()
>>> tree2.format_inline("Building projects...")
'Building projects...'
>>> tree2.on_event({"event": "session_created", "name": "cihai", "window_total": 3})
>>> tree2.format_inline("Building projects...")
'Building projects... cihai'
>>> tree2.on_event({"event": "window_started", "name": "gp-libs", "pane_total": 2})
>>> tree2.on_event({"event": "pane_creating", "pane_num": 1, "pane_total": 2})
>>> tree2.format_inline("Building projects...")
'Building projects... cihai [1 of 3 windows, 1 of 2 panes] gp-libs'
"""
def __init__(self, workspace_path: str = "") -> None:
self.workspace_path: str = workspace_path
self.session_name: str | None = None
self.windows: list[_WindowStatus] = []
self.window_total: int | None = None
self.session_pane_total: int | None = None
self.session_panes_done: int = 0
self.windows_done: int = 0
self._before_script_event: threading.Event = threading.Event()
def on_event(self, event: dict[str, t.Any]) -> None:
"""Update tree state from a build event dict.
Examples
--------
>>> tree = BuildTree()
>>> tree.on_event({
... "event": "session_created", "name": "dev", "window_total": 2,
... })
>>> tree.session_name
'dev'
>>> tree.window_total
2
>>> tree.on_event({
... "event": "window_started", "name": "editor", "pane_total": 3,
... })
>>> len(tree.windows)
1
>>> tree.windows[0].name
'editor'
"""
kind = event["event"]
if kind == "session_created":
self.session_name = event["name"]
self.window_total = event.get("window_total")
self.session_pane_total = event.get("session_pane_total")
elif kind == "before_script_started":
self._before_script_event.set()
elif kind == "before_script_done":
self._before_script_event.clear()
elif kind == "window_started":
self.windows.append(
_WindowStatus(name=event["name"], pane_total=event["pane_total"])
)
elif kind == "pane_creating":
if self.windows:
w = self.windows[-1]
w.pane_num = event["pane_num"]
w.pane_total = event["pane_total"]
elif kind == "window_done":
if self.windows:
w = self.windows[-1]
w.done = True
w.pane_num = None
w.pane_done = w.pane_total or 0
self.session_panes_done += w.pane_done
self.windows_done += 1
elif kind == "workspace_built":
for w in self.windows:
w.done = True
def render(self, colors: Colors, width: int) -> list[str]:
"""Render the current tree state to a list of display strings.
Parameters
----------
colors : :class:`~tmuxp._internal.colors.Colors`
Colors instance for ANSI styling.
width : int
Terminal width; window lines are truncated to ``width - 1``.
Returns
-------
list[str]
Lines to display; empty list if no session has been created yet.
"""
if self.session_name is None:
return []
lines: list[str] = [colors.heading("Session")]
for w in self.windows:
if w.done:
line = f"- {colors.success('β')} {colors.highlight(w.name)}"
elif w.pane_num is not None and w.pane_total is not None:
line = (
f"- {colors.highlight(w.name)}"
f"{colors.muted(f', pane ({w.pane_num} of {w.pane_total})')}"
)
else:
line = f"- {colors.highlight(w.name)}"
lines.append(_truncate_visible(line, width - 1, suffix=""))
return lines
def _context(self) -> dict[str, t.Any]:
"""Return the current build-state token dict for template rendering.
Examples
--------
Zero-state before any events:
>>> tree = BuildTree(workspace_path="~/.tmuxp/myapp.yaml")
>>> ev = {
... "event": "session_created",
... "name": "myapp",
... "window_total": 5,
... "session_pane_total": 10,
... }
>>> tree.on_event(ev)
>>> ctx = tree._context()
>>> ctx["workspace_path"]
'~/.tmuxp/myapp.yaml'
>>> ctx["session"]
'myapp'
>>> ctx["window_total"]
5
>>> ctx["window_index"]
0
>>> ctx["progress"]
''
>>> ctx["windows_done"]
0
>>> ctx["windows_remaining"]
5
>>> ctx["window_progress_rel"]
'0/5'
>>> ctx["session_pane_total"]
10
>>> ctx["session_panes_remaining"]
10
>>> ctx["session_pane_progress"]
'0/10'
>>> ctx["summary"]
''
After windows complete, summary shows counts:
>>> tree.on_event({"event": "window_started", "name": "w1", "pane_total": 3})
>>> tree.on_event({"event": "window_done"})
>>> tree.on_event({"event": "window_started", "name": "w2", "pane_total": 5})
>>> tree.on_event({"event": "window_done"})
>>> tree._context()["summary"]
'[2 win, 8 panes]'
"""
w = self.windows[-1] if self.windows else None
window_idx = len(self.windows)
win_tot = self.window_total or 0
pane_idx = (w.pane_num or 0) if w else 0
pane_tot = (w.pane_total or 0) if w else 0
win_progress = f"{window_idx}/{win_tot}" if win_tot and window_idx > 0 else ""
pane_progress = f"{pane_idx}/{pane_tot}" if pane_tot and pane_idx > 0 else ""
progress_parts = [
f"{win_progress} win" if win_progress else "",
f"{pane_progress} pane" if pane_progress else "",
]
progress = " Β· ".join(p for p in progress_parts if p)
win_done = self.windows_done
win_progress_rel = f"{win_done}/{win_tot}" if win_tot else ""
pane_done_cur = (
(w.pane_num or 0) if w and not w.done else (w.pane_done if w else 0)
)
pane_remaining = max(0, pane_tot - pane_done_cur)
pane_progress_rel = f"{pane_done_cur}/{pane_tot}" if pane_tot else ""
spt = self.session_pane_total or 0
session_pane_progress = f"{self.session_panes_done}/{spt}" if spt else ""
overall_percent = int(self.session_panes_done / spt * 100) if spt else 0
summary_parts: list[str] = []
if self.windows_done:
summary_parts.append(f"{self.windows_done} win")
if self.session_panes_done:
summary_parts.append(f"{self.session_panes_done} panes")
summary = f"[{', '.join(summary_parts)}]" if summary_parts else ""
return {
"workspace_path": self.workspace_path,
"session": self.session_name or "",
"window": w.name if w else "",
"window_index": window_idx,
"window_total": win_tot,
"window_progress": win_progress,
"pane_index": pane_idx,
"pane_total": pane_tot,
"pane_progress": pane_progress,
"progress": progress,
"windows_done": win_done,
"windows_remaining": max(0, win_tot - win_done),
"window_progress_rel": win_progress_rel,
"pane_done": pane_done_cur,
"pane_remaining": pane_remaining,
"pane_progress_rel": pane_progress_rel,
"session_pane_total": spt,
"session_panes_done": self.session_panes_done,
"session_panes_remaining": max(0, spt - self.session_panes_done),
"session_pane_progress": session_pane_progress,
"overall_percent": overall_percent,
"summary": summary,
}
def format_template(
self,
fmt: str,
extra: dict[str, t.Any] | None = None,
) -> str:
"""Render *fmt* with the current build state.
Returns ``""`` before ``session_created`` fires so callers can
fall back to a pre-build message. Unknown ``{tokens}`` are left
as-is (not dropped silently).
The optional *extra* dict is merged on top of :meth:`_context` so
callers (e.g. :class:`Spinner`) can inject ANSI-colored tokens like
``{bar}`` without adding color concerns to :class:`BuildTree`.
Examples
--------
>>> tree = BuildTree()
>>> tree.format_template("{session} [{progress}] {window}")
''
>>> ev = {"event": "session_created", "name": "cihai", "window_total": 3}
>>> tree.on_event(ev)
>>> tree.format_template("{session} [{progress}] {window}")
'cihai [] '
>>> ev = {"event": "window_started", "name": "editor", "pane_total": 4}
>>> tree.on_event(ev)
>>> tree.format_template("{session} [{progress}] {window}")
'cihai [1/3 win] editor'
>>> tree.on_event({"event": "pane_creating", "pane_num": 2, "pane_total": 4})
>>> tree.format_template("{session} [{progress}] {window}")
'cihai [1/3 win Β· 2/4 pane] editor'
>>> tree.format_template("minimal: {session} [{window_progress}]")
'minimal: cihai [1/3]'
>>> tree.format_template("{session} {unknown_token}")
'cihai {unknown_token}'
>>> tree.format_template("{session}", extra={"custom": "value"})
'cihai'
"""
if self.session_name is None:
return ""
ctx: dict[str, t.Any] = self._context()
if extra:
ctx = {**ctx, **extra}
return fmt.format_map(_SafeFormatMap(ctx))
def format_inline(self, base: str) -> str:
"""Return base message with current build state appended inline.
Parameters
----------
base : str
The original spinner message to start from.
Returns
-------
str
``base`` alone if no session has been created yet; otherwise
``"base session_name [W of N windows, P of M panes] window_name"``,
omitting the bracket section when there is no current window, and
omitting individual parts when their totals are not known.
"""
if self.session_name is None:
return base
parts = [base, self.session_name]
if self.windows:
w = self.windows[-1]
window_idx = len(self.windows)
bracket_parts: list[str] = []
if self.window_total is not None:
bracket_parts.append(f"{window_idx} of {self.window_total} windows")
if w.pane_num is not None and w.pane_total is not None:
bracket_parts.append(f"{w.pane_num} of {w.pane_total} panes")
if bracket_parts:
parts.append(f"[{', '.join(bracket_parts)}]")
parts.append(w.name)
return " ".join(parts)
class Spinner:
"""A threaded spinner for CLI progress.
Examples
--------
>>> import io
>>> stream = io.StringIO()
>>> with Spinner("Build...", color_mode=ColorMode.NEVER, stream=stream) as spinner:
... spinner.add_output_line("Session created: test")
... spinner.update_message("Creating window: editor")
"""
def __init__(
self,
message: str = "Loading...",
color_mode: ColorMode = ColorMode.AUTO,
stream: t.TextIO = sys.stderr,
interval: float = 0.1,
output_lines: int = DEFAULT_OUTPUT_LINES,
progress_format: str | None = None,
workspace_path: str = "",
) -> None:
"""Initialize spinner.
Parameters
----------
message : str
Text displayed next to the spinner animation.
color_mode : :class:`~tmuxp._internal.colors.ColorMode`
ANSI color mode for styled output.
stream : t.TextIO
Output stream (default ``sys.stderr``).
interval : float
Seconds between animation frames.
output_lines : int
Max lines in the scrolling output panel. ``0`` hides the panel,
``-1`` means unlimited.
progress_format : str | None
Format string for progress output. Tokens are documented in
:class:`BuildTree`. ``None`` uses the built-in default.
workspace_path : str
Absolute path to the workspace config file, shown in success
output.
"""
self.message = message
self._base_message = message
self.colors = Colors(color_mode)
self.stream = stream
self.interval = interval
self._stop_event = threading.Event()
self._thread: threading.Thread | None = None
self._enabled = self._should_enable()
self._panel_hidden = output_lines == 0
if output_lines < 0:
self._output_lines: collections.deque[str] = (
collections.deque()
) # unlimited
elif output_lines == 0:
self._output_lines = collections.deque(maxlen=1) # drop, never render
else:
self._output_lines = collections.deque(maxlen=output_lines)
self._prev_height: int = 0
self._build_tree: BuildTree = BuildTree(workspace_path=workspace_path)
self._progress_format: str | None = (
resolve_progress_format(progress_format)
if progress_format is not None
else None
)
def _should_enable(self) -> bool:
"""Check if spinner should be enabled (TTY check)."""
return self.stream.isatty()
def _restore_cursor(self) -> None:
"""Unconditionally restore cursor β called by atexit on abnormal exit."""
self.stream.write(SHOW_CURSOR)
self.stream.flush()
def _spin(self) -> None:
"""Spin in background thread."""
frames = itertools.cycle(SPINNER_FRAMES)
march_pos = 0 # marching bar position counter (local to _spin)
self.stream.write(HIDE_CURSOR)
self.stream.flush()
try:
while not self._stop_event.is_set():
frame = next(frames)
term_width = shutil.get_terminal_size(fallback=(80, 24)).columns
if self._panel_hidden:
panel: list[str] = []
else:
term_height = shutil.get_terminal_size(
fallback=(80, 24),
).lines
raw_panel = list(self._output_lines)
max_panel = term_height - 2
if len(raw_panel) > max_panel:
raw_panel = raw_panel[-max_panel:]
panel = [
_truncate_visible(line, term_width - 1, suffix="")
for line in raw_panel
]
new_height = len(panel) + 1 # panel lines + spinner line
parts: list[str] = []
# Erase previous render (cursor is at end of previous spinner line)
if self._prev_height > 0:
parts.append(f"{CURSOR_TO_COL0}{ERASE_LINE}")
parts.extend(
f"{CURSOR_UP_1}{ERASE_LINE}"
for _ in range(self._prev_height - 1)
)
# Write panel lines (tree lines already constrained by render())
parts.extend(f"{output_line}\n" for output_line in panel)
# Determine final spinner message
if (
self._progress_format is not None
and self._build_tree._before_script_event.is_set()
):
# Marching bar: sweep a 2-cell highlight across the bar
p = march_pos % max(1, BAR_WIDTH - 1)
march_bar = (
self.colors.muted("β" * p)
+ self.colors.warning("ββ")
+ self.colors.muted("β" * max(0, BAR_WIDTH - p - 2))
)
tree = self._build_tree
extra: dict[str, t.Any] = {
"session": self.colors.highlight(
tree.session_name or "",
),
"bar": march_bar,
"pane_bar": march_bar,
"window_bar": march_bar,
"status_icon": self.colors.warning("βΈ"),
}
rendered = self._build_tree.format_template(
self._progress_format, extra=extra
)
msg = rendered if rendered else self._base_message
march_pos += 1
else:
msg = self.message
march_pos = 0 # reset when not in before_script
# Write spinner line (no trailing newline β cursor stays here)
spinner_text = f"{self.colors.info(frame)} {msg}"
if _visible_len(spinner_text) > term_width - 1:
spinner_text = _truncate_visible(spinner_text, term_width - 4)
parts.append(f"{CURSOR_TO_COL0}{spinner_text}")
# Wrap entire frame in synchronized output to prevent flicker.
# Terminals that don't support it safely ignore the sequences.
self.stream.write(SYNC_START + "".join(parts) + SYNC_END)
self.stream.flush()
self._prev_height = new_height
time.sleep(self.interval)
finally:
# Erase the whole block and show cursor
if self._prev_height > 0:
self.stream.write(f"{CURSOR_TO_COL0}{ERASE_LINE}")
for _ in range(self._prev_height - 1):
self.stream.write(f"{CURSOR_UP_1}{ERASE_LINE}")
self.stream.write(SHOW_CURSOR)
self.stream.flush()
self._prev_height = 0
def add_output_line(self, line: str) -> None:
r"""Append a line to the live output panel (thread-safe via GIL).
When the spinner is disabled (non-TTY), writes directly to the stream
so output is not silently swallowed.
Examples
--------
>>> import io
>>> stream = io.StringIO()
>>> spinner = Spinner("test", color_mode=ColorMode.NEVER, stream=stream)
>>> spinner.add_output_line("hello world")
>>> stream.getvalue()
'hello world\n'
"""
stripped = line.rstrip("\n\r")
if stripped:
if self._enabled:
self._output_lines.append(stripped)
else:
self.stream.write(stripped + "\n")
self.stream.flush()
def update_message(self, message: str) -> None:
"""Update the message displayed next to the spinner.
Examples
--------
>>> import io
>>> stream = io.StringIO()
>>> spinner = Spinner("initial", color_mode=ColorMode.NEVER, stream=stream)
>>> spinner.message
'initial'
>>> spinner.update_message("updated")
>>> spinner.message
'updated'
"""
self.message = message
def _build_extra(self) -> dict[str, t.Any]:
"""Return spinner-owned template tokens (colored bar, status_icon).
These are separated from :meth:`BuildTree._context` to keep ANSI/color
concerns out of :class:`BuildTree`, which is also used in tests without
colors.
Examples
--------
>>> import io
>>> stream = io.StringIO()
>>> spinner = Spinner("x", color_mode=ColorMode.NEVER, stream=stream)
>>> spinner._build_tree.on_event(
... {
... "event": "session_created",
... "name": "s",
... "window_total": 4,
... "session_pane_total": 8,
... }
... )
>>> extra = spinner._build_extra()
>>> extra["bar"]
'ββββββββββ'
>>> extra["status_icon"]
''
"""
tree = self._build_tree
win_tot = tree.window_total or 0
spt = tree.session_pane_total or 0
# Composite fraction: (windows_done + pane_frac) / window_total
if win_tot > 0:
cw = tree.windows[-1] if tree.windows else None
pane_frac = 0.0
if cw and not cw.done and cw.pane_total:
pane_frac = (cw.pane_num or 0) / cw.pane_total
composite_done = tree.windows_done + pane_frac
composite_bar = render_bar(int(composite_done * 100), win_tot * 100)
else:
composite_bar = render_bar(0, 0)
pane_bar = render_bar(tree.session_panes_done, spt)
window_bar = render_bar(tree.windows_done, win_tot)
def _color_bar(plain: str) -> str:
if not plain:
return plain
filled = plain.count("β")
empty = plain.count("β")
return self.colors.success("β" * filled) + self.colors.muted("β" * empty)
return {
"session": self.colors.highlight(tree.session_name or ""),
"bar": _color_bar(composite_bar),
"pane_bar": _color_bar(pane_bar),
"window_bar": _color_bar(window_bar),
"status_icon": "",
}
def on_build_event(self, event: dict[str, t.Any]) -> None:
"""Forward build event to BuildTree and update spinner message inline.
Examples
--------
>>> import io
>>> stream = io.StringIO()
>>> spinner = Spinner("Loading", color_mode=ColorMode.NEVER, stream=stream)
>>> spinner.on_build_event({
... "event": "session_created", "name": "myapp",
... "window_total": 2, "session_pane_total": 3,
... })
>>> spinner._build_tree.session_name
'myapp'
"""
self._build_tree.on_event(event)
if self._progress_format is not None:
extra = self._build_extra()
rendered = self._build_tree.format_template(
self._progress_format, extra=extra
)
# Only switch to template output once a window has started so that