Fix <vm:anon> display: move effect to _eff let binding
The effect form returns a VM closure (disposer) which the island DOM renderer displayed as text. Moving it to a let binding (_eff) captures the return value without rendering it. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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@@ -1,4 +1,4 @@
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;; Pretext island — full version with :ref (bug fix applied)
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;; Pretext island — effect as let binding
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(defisland
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~pretext-demo/live
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()
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@@ -10,99 +10,97 @@
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(doc (host-global "document"))
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(canvas (host-call doc "createElement" "canvas"))
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(ctx (host-call canvas "getContext" "2d"))
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(el-ref (signal nil)))
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(effect
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(fn
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()
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(let
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((el (deref el-ref))
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(w (deref mxw))
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(sz (deref font-size))
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(opt (deref use-optimal)))
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(when
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el
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(el-ref (signal nil))
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(_eff
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(effect
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(fn
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()
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(let
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((lh (* sz 1.5)))
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(host-set!
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ctx
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"font"
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(str sz "px 'Pretext Serif', DejaVu Serif, serif"))
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(let
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((widths (map (fn (wd) (host-get (host-call ctx "measureText" wd) "width")) words))
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(spw (host-get (host-call ctx "measureText" " ") "width")))
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((el (deref el-ref))
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(w (deref mxw))
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(sz (deref font-size))
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(opt (deref use-optimal)))
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(when
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el
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(host-set!
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ctx
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"font"
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(str sz "px 'Pretext Serif', DejaVu Serif, serif"))
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(let
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((ranges (if opt (break-lines widths spw w) (break-lines-greedy widths spw w)))
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(lines
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(pretext-layout-lines
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words
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widths
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(if
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opt
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(break-lines widths spw w)
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(break-lines-greedy widths spw w))
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spw
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w
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lh)))
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(host-set! el "innerHTML" "")
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((lh (* sz 1.5))
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(widths
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(map
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(fn
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(wd)
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(host-get (host-call ctx "measureText" wd) "width"))
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words))
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(spw
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(host-get (host-call ctx "measureText" " ") "width")))
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(let
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((info (host-call doc "createElement" "div")))
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(host-set! info "className" "px-4 pt-3 pb-1")
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(host-set!
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info
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"innerHTML"
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(str
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"<span class='text-xs font-medium uppercase tracking-wide text-stone-400'>"
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(len lines)
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" lines — "
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w
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"px / "
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sz
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"px / "
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(if opt "optimal" "greedy")
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"</span>"))
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(host-call el "appendChild" info))
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(let
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((container (host-call doc "createElement" "div")))
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(host-set!
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container
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"style"
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(str
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"position:relative;height:"
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(* (len lines) lh)
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"px;padding:12px 16px"))
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((ranges (if opt (break-lines widths spw w) (break-lines-greedy widths spw w))))
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(let
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render-lines
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((li 0))
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(when
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(< li (len lines))
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(let
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((line (nth lines li))
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(wds (get (nth lines li) :words)))
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((lines (pretext-layout-lines words widths ranges spw w lh))
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(info (host-call doc "createElement" "div"))
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(container (host-call doc "createElement" "div")))
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(host-set! el "innerHTML" "")
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(host-set! info "className" "px-4 pt-3 pb-1")
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(host-set!
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info
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"innerHTML"
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(str
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"<span class='text-xs font-medium uppercase tracking-wide text-stone-400'>"
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(len lines)
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" lines — "
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w
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"px / "
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sz
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"px / "
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(if opt "optimal" "greedy")
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"</span>"))
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(host-call el "appendChild" info)
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(host-set!
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container
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"style"
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(str
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"position:relative;height:"
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(+ (* (len lines) lh) 24)
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"px;padding:12px 16px"))
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(let
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rl
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((li 0))
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(when
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(< li (len lines))
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(let
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render-words
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((wi 0))
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(when
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(< wi (len wds))
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(let
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((pw (nth wds wi))
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(span
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(host-call doc "createElement" "span")))
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(host-set! span "textContent" (get pw :word))
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(host-set!
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span
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"style"
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(str
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"position:absolute;left:"
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(+ (get pw :x) 16)
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"px;top:"
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(+ (get line :y) 12)
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"px;font:"
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sz
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"px 'Pretext Serif',serif;white-space:nowrap"))
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(host-call container "appendChild" span)
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(render-words (+ wi 1))))))
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(render-lines (+ li 1))))
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(host-call el "appendChild" container)))))))))
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((line (nth lines li))
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(wds (get (nth lines li) :words)))
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(let
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rw
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((wi 0))
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(when
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(< wi (len wds))
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(let
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((pw (nth wds wi))
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(span
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(host-call doc "createElement" "span")))
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(host-set!
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span
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"textContent"
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(get pw :word))
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(host-set!
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span
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"style"
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(str
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"position:absolute;left:"
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(+ (get pw :x) 16)
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"px;top:"
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(+ (get line :y) 12)
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"px;font:"
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sz
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"px 'Pretext Serif',serif;white-space:nowrap"))
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(host-call container "appendChild" span)
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(rw (+ wi 1))))))
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(rl (+ li 1))))
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(host-call el "appendChild" container))))))))))
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(div
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(~tw :tokens "space-y-4")
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(div
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@@ -144,6 +142,6 @@
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:on-click (fn (e) (reset! use-optimal (not (deref use-optimal))))
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(if (deref use-optimal) "Knuth-Plass" "Greedy"))))
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(div
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:class "rounded-lg border border-stone-200 bg-white overflow-hidden"
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:class "rounded-lg border border-stone-200 bg-white"
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:ref (fn (el) (reset! el-ref el))
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""))))
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