Add Kitty window and tab chooser with previews
This commit is contained in:
Petr Nyc
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"""Keyboard-driven tree picker used by choose_tab.py."""
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import json
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import re
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import sys
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import unicodedata
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from kittens.tui.handler import Handler, result_handler
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from kittens.tui.loop import Loop
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from kitty.fast_data_types import truncate_point_for_length, wcswidth
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RESET = '\x1b[0m'
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CONTROLS = re.compile(
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r'\x1b(?:\][^\x07\x1b]*(?:\x07|\x1b\\)|[PX^_].*?\x1b\\|'
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r'\[[0-?]*[ -/]*[@-~]|[@-_])', re.DOTALL)
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SGR = re.compile(r'\x1b\[[0-9;:]*m\Z')
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def clean_text(text):
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text = CONTROLS.sub('', text)
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return ''.join(c for c in text if not unicodedata.category(c).startswith('C'))
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def clip_text(text, width):
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end = truncate_point_for_length(text, width)
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while end < len(text) and unicodedata.category(text[end]) in ('Mn', 'Me'):
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end += 1
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return text[:end]
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def clip_ansi(text, width):
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"""Retain only SGR formatting; never let a snapshot control the terminal."""
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result = []
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used = 0
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end = 0
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for match in CONTROLS.finditer(text):
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plain = clean_text(text[end:match.start()])
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piece = clip_text(plain, max(0, width - used))
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result.append(piece)
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used += wcswidth(piece)
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if len(piece) != len(plain):
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return ''.join(result) + RESET
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if SGR.fullmatch(match.group()):
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result.append(match.group())
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end = match.end()
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plain = clean_text(text[end:])
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result.append(clip_text(plain, max(0, width - used)))
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return ''.join(result) + RESET
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class Preview:
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"""Position a colored, cell-clipped preview inside a terminal rectangle."""
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def __init__(self, top, width, height):
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self.top, self.width, self.height = top, width, height
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self.output = []
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def put(self, x, y, text, width):
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if 0 <= x < self.width and 0 <= y < self.height:
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width = min(width, self.width - x)
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if width > 0:
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self.output.append(f'\x1b[{self.top + y};{x + 1}H{RESET}'
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+ clip_ansi(text, width))
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def box(self, x, y, width, height, title='', active=False):
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if width < 2 or height < 2:
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return
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color = '\x1b[33m' if active else '\x1b[90m'
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self.put(x, y, color + '┌' + '─' * (width - 2) + '┐', width)
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for row in range(y + 1, y + height - 1):
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self.put(x, row, color + '│', 1)
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self.put(x + width - 1, row, color + '│', 1)
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self.put(x, y + height - 1, color + '└' + '─' * (width - 2) + '┘', width)
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if title:
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self.put(x + 1, y, color + ' ' + clean_text(title) + ' ', width - 2)
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def badge(self, x, y, width, height, label, active):
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if width < 5 or height < 3:
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return
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label = clip_text(clean_text(label), width - 4)
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badge_width = wcswidth(label) + 4
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bx = x + (width - badge_width) // 2
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by = y + (height - 3) // 2
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self.box(bx, by, badge_width, 3)
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color = '\x1b[33m' if active else '\x1b[34m'
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self.put(bx + 1, by + 1, color + ' ' + label + ' ', badge_width - 2)
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def tab(self, snapshot, x, y, width, height, title=None, active=False):
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panes = snapshot.get('panes', []) if snapshot else []
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if not panes:
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self.put(x, y, 'Preview unavailable', width)
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if title is not None:
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self.badge(x, y, width, height, title, active)
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return
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left = min(p['rect'][0] for p in panes)
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top = min(p['rect'][1] for p in panes)
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right = max(p['rect'][2] for p in panes)
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bottom = max(p['rect'][3] for p in panes)
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small = 0
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dividers = []
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badges = []
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for index, pane in enumerate(panes, 1):
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l, t, r, b = pane['rect']
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px = x + round((l - left) * width / max(1, right - left))
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py = y + round((t - top) * height / max(1, bottom - top))
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pw = x + round((r - left) * width / max(1, right - left)) - px
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ph = y + round((b - top) * height / max(1, bottom - top)) - py
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if l > left:
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dividers.extend((px, row, '│', 1) for row in range(py, py + ph))
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px, pw = px + 1, pw - 1
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if t > top:
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dividers.append((px, py, '─' * max(0, pw), pw))
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py, ph = py + 1, ph - 1
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if pw < 1 or ph < 1:
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small += 1
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continue
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lines = pane.get('lines')
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for row, line in enumerate((lines if lines is not None else ['Preview unavailable'])[:ph]):
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self.put(px, py + row, line, pw)
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if title is None:
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badges.append((px, py, pw, ph, str(index), pane['active']))
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for dx, dy, text, count in dividers:
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self.put(dx, dy, '\x1b[90m' + text, count)
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for badge in badges:
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self.badge(*badge)
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if title is not None:
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self.badge(x, y, width, height, title, active)
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if small:
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self.put(x, y + height - 1, f'{small} pane(s) too small', width)
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class WindowPicker(Handler):
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def __init__(self, entries, collapsed=False, snapshots=None):
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self.all_entries = entries
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self.groups = {i for i, entry in enumerate(entries) if entry['kind'] == 'window'}
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self.collapsed = set(self.groups) if collapsed else set()
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self.selected = 0
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self.offset = 0
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self.answer = None
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self.query = ''
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self.searching = False
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self.search_origin = ('', 0)
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self.snapshots = snapshots or {}
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self.preview_pages = {}
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def visible_indices(self):
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hidden = False
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visible = []
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for index in range(len(self.all_entries)):
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if index in self.groups:
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hidden = index in self.collapsed
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visible.append(index)
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elif not hidden:
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visible.append(index)
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return visible
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@property
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def entries(self):
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return [self.all_entries[i] for i in self.visible_indices()]
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def expand_group(self, expand):
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visible = self.visible_indices()
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if not visible:
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return
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index = visible[self.selected]
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if index not in self.groups:
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return
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if expand:
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self.collapsed.discard(index)
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else:
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self.collapsed.add(index)
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self.draw()
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def matches(self):
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if not self.query:
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return []
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query = self.query.casefold()
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return [i for i, entry in enumerate(self.entries)
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if query in clean_text(entry['label']).casefold()]
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def update_search(self):
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matches = self.matches()
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if matches and self.selected not in matches:
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self.selected = next((i for i in matches if i >= self.selected), matches[0])
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self.draw()
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def next_match(self, delta):
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matches = self.matches()
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if matches:
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ordered = matches if delta > 0 else list(reversed(matches))
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self.selected = next(
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(i for i in ordered if (i - self.selected) * delta > 0), ordered[0])
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self.draw()
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def initialize(self):
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self.draw()
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def preview_height(self):
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if self.screen_size.rows < 18 or self.screen_size.cols < 24:
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return 0
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return (self.screen_size.rows - 1) // 2
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def page_preview(self, delta):
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if self.entries and self.preview_height():
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entry = self.entries[self.selected]
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if entry['kind'] == 'window':
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capacity = max(1, (self.screen_size.cols - 2) // 24)
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count = len(entry['tabs'])
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default = entry['tabs'].index(entry['tab_id']) // capacity
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page = self.preview_pages.get(id(entry), default)
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self.preview_pages[id(entry)] = max(0, min((count - 1) // capacity, page + delta))
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self.draw()
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def draw_preview(self, height):
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preview = Preview(self.screen_size.rows - height, self.screen_size.cols, height)
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if not self.entries:
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preview.box(0, 0, preview.width, height, 'Snapshot')
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return ''.join(preview.output)
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entry = self.entries[self.selected]
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tab_ids = entry.get('tabs', [entry['tab_id']])
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capacity = max(1, (preview.width - 2) // 24) if entry['kind'] == 'window' else 1
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pages = max(1, (len(tab_ids) + capacity - 1) // capacity)
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default = tab_ids.index(entry['tab_id']) // capacity
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page = min(pages - 1, self.preview_pages.get(id(entry), default))
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self.preview_pages[id(entry)] = page
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start = page * capacity
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shown = tab_ids[start:start + capacity]
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label = f'{entry["title"]} — snapshot'
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if pages > 1:
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label += f' — tabs {start + 1}–{start + len(shown)}/{len(tab_ids)} [{page + 1}/{pages}]'
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preview.box(0, 0, preview.width, height, label)
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inner_width = preview.width - 2
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for offset, tab_id in enumerate(shown):
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left = 1 + offset * inner_width // len(shown)
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right = 1 + (offset + 1) * inner_width // len(shown)
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if offset:
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for row in range(1, height - 1):
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preview.put(left, row, '\x1b[90m│', 1)
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left += 1
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snapshot = self.snapshots.get(str(tab_id))
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title = None
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if entry['kind'] == 'window':
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title = f'{start + offset + 1}:{snapshot["title"] if snapshot else "Tab"}'
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active = tab_id == entry['tab_id']
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preview.tab(snapshot, left, 1, right - left, height - 2,
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title, active)
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return ''.join(preview.output)
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def draw(self):
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height = self.preview_height()
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rows = max(1, self.screen_size.rows - 1 - height)
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cols = max(1, self.screen_size.cols)
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self.offset = min(self.offset, self.selected)
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self.offset = max(self.offset, self.selected - rows + 1)
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output = ["\x1b[?25l\x1b[H\x1b[2J"]
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matches = self.matches()
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visible = self.visible_indices()
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for index in range(self.offset, min(len(self.entries), self.offset + rows)):
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label = self.entries[index]['label']
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if visible[index] in self.collapsed:
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label = '+' + label[1:]
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# Titles are untrusted terminal text: strip control sequences/characters.
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label = clean_text(label)
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line = f"({index}) {label}"
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line = line[:truncate_point_for_length(line, cols)]
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style = "\x1b[1;33m" if index in matches else ""
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if index == self.selected:
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style += "\x1b[7m"
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output.append(f"{style}{line}\x1b[K\x1b[0m\r\n")
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if height:
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output.append(self.draw_preview(height))
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footer = 'j/k ↑/↓ move h/l ←/→ fold / search'
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footer += ' [] page' if height else ''
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footer += ' Enter select Esc cancel'
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if not height:
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footer += ' Preview needs 24 cols × 18 rows'
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if self.searching or self.query:
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position = str(matches.index(self.selected) + 1) if self.selected in matches else '-'
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status = f"{position}/{len(matches)}" if matches else "no matches"
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help_text = "Enter: finish search Esc: undo" if self.searching else "n/N: next/previous /: search"
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footer = f"/{self.query} [{status}] {help_text}"
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footer = footer[:truncate_point_for_length(footer, cols)]
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output.append(f"\x1b[0m\x1b[{self.screen_size.rows};1H{footer}")
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self.write(''.join(output))
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def move(self, delta):
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self.selected = max(0, min(len(self.entries) - 1, self.selected + delta))
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self.draw()
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def on_text(self, text, in_bracketed_paste=False):
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if len(text) > 1 and not in_bracketed_paste:
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for char in text:
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self.on_text(char)
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return
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if self.searching:
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self.query += ''.join(c for c in text if not unicodedata.category(c).startswith('C'))
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self.update_search()
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elif not in_bracketed_paste:
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if text == '/':
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self.search_origin = (self.query, self.selected)
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self.query = ''
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self.searching = True
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self.draw()
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elif text == 'n':
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self.next_match(1)
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elif text == 'N':
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self.next_match(-1)
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elif text == 'j':
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self.move(1)
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elif text == 'k':
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self.move(-1)
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elif text == 'h':
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self.expand_group(False)
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elif text == 'l':
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self.expand_group(True)
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elif text == '[':
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self.page_preview(-1)
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elif text == ']':
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self.page_preview(1)
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elif text == 'q':
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self.quit_loop(0)
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def on_key(self, key):
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if key.is_release:
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return
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if self.searching:
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if key.matches('enter'):
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self.searching = False
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self.draw()
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return
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if key.matches('escape'):
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self.query, self.selected = self.search_origin
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self.searching = False
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self.draw()
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return
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if key.matches('backspace'):
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self.query = self.query[:-1]
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self.update_search()
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return
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if key.matches('ctrl+u'):
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self.query = ''
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self.update_search()
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return
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if key.matches('left') or key.matches('right'):
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return
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if key.matches('down'):
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self.move(1)
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elif key.matches('up'):
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self.move(-1)
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elif key.matches('left'):
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self.expand_group(False)
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elif key.matches('right'):
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self.expand_group(True)
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elif key.matches('enter'):
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if self.entries:
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self.answer = self.entries[self.selected]['tab_id']
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self.quit_loop(0)
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elif key.matches('escape'):
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self.quit_loop(0)
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def on_resize(self, size):
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super().on_resize(size)
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self.draw()
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def on_interrupt(self):
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self.quit_loop(0)
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def on_eot(self):
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self.quit_loop(0)
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def main(args):
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payload = json.load(sys.stdin)
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picker = WindowPicker(payload['entries'], collapsed='--collapsed' in args[1:],
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snapshots=payload['snapshots'])
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Loop().loop(picker)
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return picker.answer
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@result_handler()
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def handle_result(args, answer, target_window_id, boss):
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# choose_tab.py supplies the callback and activates after this overlay closes.
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pass
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Reference in New Issue
Block a user