start coding one line canvas

one_line/main.fnl

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+
+(tset _G :img-width 88)
+(tset _G :img-height 31)
+
+(local scale 6)
+(tset _G :canvas-width (* scale (. _G :img-width)))
+(tset _G :canvas-height (* scale (. _G :img-height)))
+
+(lambda set-center-origin []
+  (let [(w h f) (love.window.getMode)
+    x (/ w 2)
+    y (/ h 2)
+    ]
+    ; (print (..  "setting orgin to middle of window: " x "," y))
+    (love.graphics.push)
+    (love.graphics.translate x y)))
+
+(fn love.load []
+  ;; 480p 720×480
+  (love.window.setMode  720 480)
+  ; (set-center-origin)
+  ; (love.graphics.pop)
+
+
+  ;; start a thread listening on stdin
+  (: (love.thread.newThread "require('love.event')
+while 1 do love.event.push('stdin', io.read('*line')) end") :start))
+
+(fn love.handlers.stdin [line]
+  ; evaluate lines read from stdin as fennel code
+  (let [(ok val) (pcall fennel.eval line)]
+    (print (if ok (fennel.view val) val))))
+
+
+(lambda draw-static-bg []
+  (let [
+    canvas-w (* scale 88)
+    canvas-h (* scale 31)
+    canvas-x (* -1 (/ canvas-w 2))
+    canvas-y (* -1 (/ canvas-h 2))
+    ]
+    ; canvas
+    (love.graphics.print "Canvas:" canvas-x (- canvas-y 20))
+    (love.graphics.rectangle "line" canvas-x canvas-y canvas-w canvas-h)
+    ; preview
+    (love.graphics.print "Preview:" canvas-x (- canvas-y 80))
+    (love.graphics.rectangle "line" canvas-x (- canvas-y 60) 89 32)
+    )
+)
+
+(fn love.draw []
+  (set-center-origin)
+  (love.graphics.setBackgroundColor (love.math.colorFromBytes 192 192 192))
+  (love.graphics.setColor (love.math.colorFromBytes 29 29 29))
+  (draw-static-bg)
+  (love.graphics.pop))
+
+(fn love.keypressed [key]
+  (love.event.quit))

one_line/main.lua

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+fennel = require("fennel")
+debug.traceback = fennel.traceback
+table.insert(package.loaders, function(filename)
+   if love.filesystem.getInfo(filename) then
+      return function(...)
+         return fennel.eval(love.filesystem.read(filename), {env=_G, filename=filename}, ...), filename
+      end
+   end
+end)
+-- jump into Fennel
+require("main.fnl")