feat: the cache and slackware cards move to quickshell

Both cards are now drawn by quickshell, so the conky copies go: the two
widgets, their samplers and texeci lines, their fixtures and icons, and
du_parse with human_bytes, which only the cache card used. kv_parse stays
for breaktimer; its test now runs on an inline string. README gains a
Samplers section listing what conky still schedules, and DESIGN.md's
examples point at the cards that remain. Their slots in the layout are
left open.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

3 files changed, 1 insertions, 201 deletions

diff --git a/widgets/breaktimer.lua b/widgets/breaktimer.lua
index 6fed30e..fa8649b 100644
--- a/widgets/breaktimer.lua
+++ b/widgets/breaktimer.lua
@@ -25,7 +25,7 @@ function M.draw(cr, rect, colors)
 
   local bt = data.breaktimer_parse(data.slurp(CACHE) or '')
 
-  -- No cache at all: the sampler has not run. Name it, as the slackware card
+  -- No cache at all: the sampler has not run. Name it, as every cached card
   -- does, rather than leaving a blank cell that is indistinguishable from a
   -- crash. A stopped daemon is NOT this case: the sampler still writes a cache,
   -- with running no, which the card draws as 'fermo'.
diff --git a/widgets/cache.lua b/widgets/cache.lua
deleted file mode 100644
index c6391ca..0000000
--- a/widgets/cache.lua
+++ /dev/null
@@ -1,83 +0,0 @@
--- Cache: ~/.cache total and its four largest subdirectories.
---
--- Reads a cache file written by bin/cache-sample.sh. du walks the tree and
--- costs about 100ms, which cannot happen on a 2-second draw.
-
-local card = require 'lib.card'
-local data = require 'lib.data'
-
-local CACHE = (os.getenv('XDG_CACHE_HOME') or (os.getenv('HOME') .. '/.cache'))
-  .. '/udt/cachesize.txt'
-
-local M = {}
-
-function M.draw(cr, rect, colors)
-  local inner = card.card(cr, rect, colors)
-  local function clamp(v, lo, hi) return math.max(lo, math.min(hi, v)) end
-  -- Fluid type. One base size S drives every element. The height budget makes
-  -- the content fill the cell; the measured width fit pulls S down only where
-  -- the header or a row would overrun the card. A tall cell gets larger type
-  -- instead of empty space, and nothing collides.
-  local LABEL_F, ROW_F = 0.30, 0.32
-
-  local c = data.du_parse(data.slurp(CACHE) or '')
-  if not c then
-    card.notice(cr, inner, colors, 'CACHE', 'no cache data', 'bin/cache-sample.sh')
-    return
-  end
-
-  local items = c.items or {}
-  local names = {}
-  for i, e in ipairs(items) do
-    -- By character, not byte: a cache directory can carry an accented name and
-    -- a byte slice cuts one in half, which Cairo draws as a replacement box.
-    names[i] = card.truncate(e.name, 18)
-  end
-
-  local row_n = #items
-  local S_h = inner.h * 0.94 / (1.78 + row_n * 0.64)
-  local groups = {
-    { { card.title_str(card.ICON.cache, 'CACHE'), card.FONT_MONO, LABEL_F },
-      { c.total.label, card.FONT_HEAVY, 1.0 } },
-  }
-  for i = 1, row_n do
-    groups[#groups + 1] = { { names[i], card.FONT_MONO, ROW_F },
-                            { items[i].label, card.FONT_MONO, ROW_F } }
-  end
-  local S = clamp(math.min(S_h, card.fit_unit(cr, inner.w * 0.96, groups, 100)), 10, 72)
-  local label_size = S * LABEL_F
-  local row_size   = S * ROW_F
-
-  card.font(cr, card.FONT_MONO, label_size, false)
-  card.title(cr, inner.x, inner.y + label_size, card.ICON.cache, 'CACHE', colors)
-
-  -- The total shares the header line with the label, set on the same baseline
-  -- and right-aligned: the width carries the number instead of an otherwise
-  -- empty row beneath it.
-  card.font(cr, card.FONT_HEAVY, S, false)
-  card.rgba(cr, colors.body)
-  card.text_right(cr, inner.x + inner.w, inner.y + S, c.total.label)
-
-  local ey = inner.y + S + label_size * 2.6
-  local step = row_size * 2.0
-
-  card.font(cr, card.FONT_MONO, row_size, false)
-  for i, e in ipairs(items) do
-    if ey + step > inner.y + inner.h then break end
-    -- The biggest offender is the point of the card, so it carries colour:
-    -- critical when it is over half the total, warning otherwise. The rest
-    -- stay in the ordinary value colour so the eye lands on the one to delete.
-    local colour = colors.value
-    if i == 1 then
-      local share = c.total.bytes > 0 and (e.bytes / c.total.bytes) or 0
-      colour = share > 0.5 and colors.critical or colors.warning
-    end
-    card.rgba(cr, colors.label)
-    card.text(cr, inner.x, ey, names[i])
-    card.rgba(cr, colour)
-    card.text_right(cr, inner.x + inner.w, ey, e.label)
-    ey = ey + step
-  end
-end
-
-return M
diff --git a/widgets/slackware.lua b/widgets/slackware.lua
deleted file mode 100644
index 1971ca1..0000000
--- a/widgets/slackware.lua
+++ /dev/null
@@ -1,117 +0,0 @@
--- Slackware: the distribution version, package count, kernel, install age, and
--- how long since slackpkg's ChangeLog last changed.
---
--- Everything comes from a cache file written by bin/slackware-sample.sh:
--- conky's Lua cannot stat a file for an mtime, and counting the package
--- directory every two seconds would be a walk per draw.
-
-local card = require 'lib.card'
-local data = require 'lib.data'
-
-local CACHE = (os.getenv('XDG_CACHE_HOME') or (os.getenv('HOME') .. '/.cache'))
-  .. '/udt/slackware.txt'
-
--- Hours. A ChangeLog under a day old is current, under a week is ordinary, and
--- past that is worth noticing. This extends the shell prompt's binary green/red
--- into the board's three-state language rather than adding a fourth convention.
-local WARN_H, CRIT_H = 24, 168
-
-local SUBTITLE = 'last slackpkg update'
-
-local M = {}
-
--- An age in seconds as a short string: hours below two days, then days. Short
--- because it is the card's big value and shares its line with the label.
-local function age_str(seconds)
-  if not seconds then return '--' end
-  -- A future timestamp yields a negative age. Clock skew and a mirror's dated
-  -- file both produce it, and '-8000h' on the dashboard reads as a bug.
-  if seconds < 0 then seconds = 0 end
-  local hours = seconds / 3600
-  if hours < 48 then return string.format('%dh', math.floor(hours)) end
-  return string.format('%dd', math.floor(hours / 24))
-end
-
-function M.draw(cr, rect, colors)
-  local inner = card.card(cr, rect, colors)
-  local function clamp(v, lo, hi) return math.max(lo, math.min(hi, v)) end
-  local LABEL_F, BIG_F, ROW_F, SUB_F = 0.30, 1.0, 0.32, 0.26
-
-  local kv = data.kv_parse(data.slurp(CACHE) or '')
-
-  -- No cache at all: the sampler has not run. Name it, as the cache card does,
-  -- rather than leaving a blank cell that is indistinguishable from a crash.
-  if not kv.version then
-    card.notice(cr, inner, colors, 'SLACKWARE', 'no slackware data',
-      'bin/slackware-sample.sh')
-    return
-  end
-
-  -- The ChangeLog age, the card's headline. A cache that exists without this
-  -- key is a different failure from no cache: the sampler ran and the
-  -- ChangeLog is what was missing, so the rows still draw and only this reads
-  -- '--'.
-  local changelog = tonumber(kv.changelog)
-  local age_s = (changelog and changelog > 0) and (os.time() - changelog) or nil
-  local age_txt = age_str(age_s)
-  local age_colour = colors.label
-  if age_s then
-    age_colour = card.threshold(math.max(age_s, 0) / 3600, WARN_H, CRIT_H, colors)
-  end
-
-  -- 'Slackware 15.0+' -> '15.0+': the header already says which distribution.
-  local version = (kv.version or ''):gsub('^Slackware%s+', '')
-
-  local birth = tonumber(kv.birth)
-  local install_age = (birth and birth > 0)
-    and string.format('%dd', math.floor((os.time() - birth) / 86400)) or '--'
-
-  local rows = {
-    { 'VERSION',  version ~= '' and version or '--' },
-    { 'PACKAGES', kv.packages or '--' },
-    { 'KERNEL',   kv.kernel or '--' },
-    { 'AGE',      install_age },
-  }
-
-  -- Fluid type: the height budget grows the content to fill the cell, the
-  -- measured width fit pulls it back where a row would overrun.
-  local groups = {
-    { { card.title_str(card.ICON.slackware, 'SLACKWARE'), card.FONT_MONO, LABEL_F },
-      { age_txt, card.FONT_HEAVY, BIG_F } },
-    { { SUBTITLE, card.FONT_UI, SUB_F } },
-  }
-  for _, r in ipairs(rows) do
-    groups[#groups + 1] = { { r[1], card.FONT_MONO, ROW_F },
-                            { tostring(r[2]), card.FONT_MONO, ROW_F } }
-  end
-  local S = clamp(math.min(inner.h * 0.94 / (1.5 + #rows * 0.66),
-    card.fit_unit(cr, inner.w * 0.96, groups, 100)), 10, 72)
-  local label_size = S * LABEL_F
-  local row_size   = S * ROW_F
-
-  card.font(cr, card.FONT_HEAVY, S * BIG_F, false)
-  card.rgba(cr, age_colour)
-  card.text_right(cr, inner.x + inner.w, inner.y + S * BIG_F, age_txt)
-
-  card.font(cr, card.FONT_MONO, label_size, false)
-  card.title(cr, inner.x, inner.y + label_size, card.ICON.slackware,
-    'SLACKWARE', colors)
-
-  card.font(cr, card.FONT_UI, S * SUB_F, false)
-  card.rgba(cr, colors.label, 0.65)
-  card.text(cr, inner.x, inner.y + label_size + S * SUB_F * 1.5, SUBTITLE)
-
-  local ey = inner.y + S * BIG_F + row_size * 1.6
-  local step = row_size * 2.0
-  card.font(cr, card.FONT_MONO, row_size, false)
-  for _, r in ipairs(rows) do
-    if ey + step > inner.y + inner.h then break end
-    card.rgba(cr, colors.label)
-    card.text(cr, inner.x, ey, r[1])
-    card.rgba(cr, colors.value)
-    card.text_right(cr, inner.x + inner.w, ey, tostring(r[2]))
-    ey = ey + step
-  end
-end
-
-return M