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Content-Disposition: inline; filename="011-errors.mu"
Last-Modified: Mon, 23 Dec 2024 13:34:38 GMT
Expires: Thu, 21 Dec 2034 13:34:38 GMT
ETag: "472588157cbdc0d8caeea168d7779838fd82fe8f"

## handling malformed programs

container environment [
  recipe-errors:text
]

# copy code from recipe editor, persist to disk, load, save any errors
def! update-recipes env:&:environment, resources:&:resources, screen:&:screen -> errors-found?:bool, env:&:environment, resources:&:resources, screen:&:screen [
  local-scope
  load-inputs
  recipes:&:editor <- get *env, recipes:offset
  in:text <- editor-contents recipes
  resources <- dump resources, [lesson/recipes.mu], in
  recipe-errors:text <- reload in
  *env <- put *env, recipe-errors:offset, recipe-errors
  # if recipe editor has errors, stop
  {
    break-unless recipe-errors
    update-status screen, [errors found     ], 1/red
    errors-found? <- copy true
    return
  }
  errors-found? <- copy false
]

after <begin-run-sandboxes-on-F4> [
  old-recipe-errors:text <- get *env, recipe-errors:offset
]
before <end-run-sandboxes-on-F4> [
  # if there were recipe errors before, check if we can clear them
  {
    break-unless old-recipe-errors
    screen <- render-recipes screen, env, render
  }
  render-recipe-errors env, screen
]

before <end-render-recipe-components> [
  row <- render-recipe-errors env, screen
]

def render-recipe-errors env:&:environment, screen:&:screen -> row:num, screen:&:screen [
  local-scope
  load-inputs
  recipe-errors:text <- get *env, recipe-errors:offset
  recipes:&:editor <- get *env, recipes:offset
  row:num <- get *recipes, bottom:offset
  row <- add row, 1
  return-unless recipe-errors
  left:num <- get *recipes, left:offset
  right:num <- get *recipes, right:offset
  row, screen <- render-text screen, recipe-errors, left, right, 1/red, row
  # draw dotted line after recipes
  draw-horizontal screen, row, left, right, 9480/horizontal-dotted
  row <- add row, 1
  clear-screen-from screen, row, left, left, right
]

container environment [
  error-index:num  # index of first sandbox with an error (or -1 if none)
]

after <programming-environment-initialization> [
  *result <- put *result, error-index:offset, -1
]

after <begin-run-sandboxes> [
  *env <- put *env, error-index:offset, -1
]

before <end-run-sandboxes> [
  {
    error-index:num <- get *env, error-index:offset
    sandboxes-completed-successfully?:bool <- equal error-index, -1
    break-if sandboxes-completed-successfully?
    errors-found? <- copy true
  }
]

before <end-run-sandboxes-on-F4> [
  {
    break-unless error?
    recipe-errors:text <- get *env, recipe-errors:offset
    break-if recipe-errors
    error-index:num <- get *env, error-index:offset
    sandboxes-completed-successfully?:bool <- equal error-index, -1
    break-if sandboxes-completed-successfully?
    error-index-text:text <- to-text error-index
    status:text <- interpolate [errors found (_)    ], error-index-text
    update-status screen, status, 1/red
  }
]

container sandbox [
  errors:text
]

def! update-sandbox sandbox:&:sandbox, env:&:environment, idx:num -> sandbox:&:sandbox, env:&:environment [
  local-scope
  load-inputs
  data:text <- get *sandbox, data:offset
  response:text, errors:text, fake-screen:&:screen, trace:text, completed?:bool <- run-sandboxed data
  *sandbox <- put *sandbox, response:offset, response
  *sandbox <- put *sandbox, errors:offset, errors
  *sandbox <- put *sandbox, screen:offset, fake-screen
  *sandbox <- put *sandbox, trace:offset, trace
  {
    break-if errors
    break-if completed?
    errors <- new [took too long!
]
    *sandbox <- put *sandbox, errors:offset, errors
  }
  {
    break-unless errors
    error-index:num <- get *env, error-index:offset
    error-not-set?:bool <- equal error-index, -1
    break-unless error-not-set?
    *env <- put *env, error-index:offset, idx
  }
]

# make sure we render any trace
after <render-sandbox-trace-done> [
  {
    sandbox-errors:text <- get *sandbox, errors:offset
    break-unless sandbox-errors
    *sandbox <- put *sandbox, response-starting-row-on-screen:offset, 0  # no response
    row, screen <- render-text screen, sandbox-errors, left, right, 1/red, row
    # don't try to print anything more for this sandbox
    jump +render-sandbox-end
  }
]

scenario run-shows-errors-in-get [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe foo [|
      |  get 123:num, foo:offset|
      |]|
    ]
  ]
  env:&:environment <- new-programming-environment resources, screen, [foo]
  render-all screen, env, render
  screen-should-contain [
    .                                                                                 run (F4)           .
    .recipe foo [                                      ┊foo                                              .
    .  get 123:num, foo:offset                         ┊─────────────────────────────────────────────────.
    .]                                                 ┊                                                 .
    .                                                  ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
  assume-console [
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  screen-should-contain [
    .  errors found                                                                   run (F4)           .
    .recipe foo [                                      ┊foo                                              .
    .  get 123:num, foo:offset                         ┊─────────────────────────────────────────────────.
    .]                                                 ┊                                                 .
    .                                                  ┊                                                 .
    .foo: unknown element 'foo' in container 'number'  ┊                                                 .
    .foo: first ingredient of 'get' should be a contai↩┊                                                 .
    .ner, but got '123:num'                            ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
  screen-should-contain-in-color 1/red, [
    .  errors found                                                                                      .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .foo: unknown element 'foo' in container 'number'                                                    .
    .foo: first ingredient of 'get' should be a contai                                                   .
    .ner, but got '123:num'                                                                              .
    .                                                                                                    .
  ]
]

scenario run-shows-errors-without-final-newline-in-recipe-side [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources [
  ]
  env:&:environment <- new-programming-environment resources, screen
  render-all screen, env, render
  assume-console [
    type [recipe foo x [
]]
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  screen-should-contain [
    .  errors found                                                                   run (F4)           .
    .recipe foo x [                                    ┊                                                 .
    .]                                                 ┊─────────────────────────────────────────────────.
    .foo: ingredient 'x' has no type                   ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
]

scenario run-updates-status-with-first-erroneous-sandbox [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources [
  ]
  env:&:environment <- new-programming-environment resources, screen, []
  render-all screen, env, render
  assume-console [
    left-click 3, 80
    # create invalid sandbox 1
    type [get foo, x:offset]
    press F4
    # create invalid sandbox 0
    type [get foo, x:offset]
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # status line shows that error is in first sandbox
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
  ]
]

scenario run-updates-status-with-first-erroneous-sandbox-2 [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources [
  ]
  env:&:environment <- new-programming-environment resources, screen, []
  render-all screen, env, render
  assume-console [
    left-click 3, 80
    # create invalid sandbox 2
    type [get foo, x:offset]
    press F4
    # create invalid sandbox 1
    type [get foo, x:offset]
    press F4
    # create valid sandbox 0
    type [add 2, 2]
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # status line shows that error is in second sandbox
  screen-should-contain [
    .  errors found (1)                                                               run (F4)           .
  ]
]

scenario run-hides-errors-from-past-sandboxes [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources [
  ]
  env:&:environment <- new-programming-environment resources, screen, [get foo, x:offset]  # invalid
  render-all screen, env, render
  assume-console [
    press F4  # generate error
  ]
  event-loop screen, console, env, resources
  assume-console [
    left-click 3, 58
    press ctrl-k
    type [add 2, 2]  # valid code
    press F4  # update sandbox
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # error should disappear
  screen-should-contain [
    .                                                                                 run (F4)           .
    .                                                  ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
    .                                                  ┊0   edit       copy       to recipe    delete    .
    .                                                  ┊add 2, 2                                         .
    .                                                  ┊4                                                .
    .                                                  ┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
  ]
]

scenario run-updates-errors-for-shape-shifting-recipes [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  # define a shape-shifting recipe with an error
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe foo x:_elem -> z:_elem [|
      |  local-scope|
      |  load-ingredients|
      |  y:&:num <- copy null|
      |  z <- add x, y|
      |]|
    ]
  ]
  env:&:environment <- new-programming-environment resources, screen, [foo 2]
  render-all screen, env, render
  assume-console [
    press F4
  ]
  event-loop screen, console, env, resources
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .recipe foo x:_elem -> z:_elem [                   ┊                                                 .
    .  local-scope                                     ┊─────────────────────────────────────────────────.
    .  load-ingredients                                ┊0   edit       copy       to recipe    delete    .
    .  y:&:num <- copy null                            ┊foo 2                                            .
    .  z <- add x, y                                   ┊foo_2: 'add' requires number ingredients, but go↩.
    .]                                                 ┊t 'y'                                            .
    .                                                  ┊─────────────────────────────────────────────────.
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
  # now rerun everything
  assume-console [
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # error should remain unchanged
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .recipe foo x:_elem -> z:_elem [                   ┊                                                 .
    .  local-scope                                     ┊─────────────────────────────────────────────────.
    .  load-ingredients                                ┊0   edit       copy       to recipe    delete    .
    .  y:&:num <- copy null                            ┊foo 2                                            .
    .  z <- add x, y                                   ┊foo_3: 'add' requires number ingredients, but go↩.
    .]                                                 ┊t 'y'                                            .
    .                                                  ┊─────────────────────────────────────────────────.
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
]

scenario run-avoids-spurious-errors-on-reloading-shape-shifting-recipes [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  # overload a well-known shape-shifting recipe
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe length l:&:list:_elem -> n:num [|
      |]|
    ]
  ]
  # call code that uses other variants of it, but not it itself
  test-sandbox:text <- new [x:&:list:num <- copy null
to-text x]
  env:&:environment <- new-programming-environment resources, screen, test-sandbox
  render-all screen, env, render
  # run it once
  assume-console [
    press F4
  ]
  event-loop screen, console, env, resources
  # no errors anywhere on screen (can't check anything else, since to-text will return an address)
  screen-should-contain-in-color 1/red, [
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                <-                                  .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
  ]
  # rerun everything
  assume-console [
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # still no errors
  screen-should-contain-in-color 1/red, [
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                <-                                  .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
  ]
]

scenario run-shows-missing-type-errors [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 15/height
  assume-resources <style>pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="ch">#!/bin/sh</span>
<span class="c1"># Compatible with ranger 1.6.0 through 1.7.*</span>
<span class="c1">#</span>
<span class="c1"># This script searches image files in a directory, opens them all with sxiv and</span>
<span class="c1"># sets the first argument to the first image displayed by sxiv.</span>
<span class="c1">#</span>
<span class="c1"># This is supposed to be used in rifle.conf as a workaround for the fact that</span>
<span class="c1"># sxiv takes no file name arguments for the first image, just the number.  Copy</span>
<span class="c1"># this file somewhere into your $PATH and add this at the top of rifle.conf:</span>
<span class="c1">#</span>
<span class="c1">#   mime ^image, has sxiv, X, flag f = path/to/this/script -- &quot;$@&quot;</span>
<span class="c1">#</span>
<span class="c1"># Implementation notes: this script is quite slow because of POSIX limitations</span>
<span class="c1"># and portability concerns. First calling the shell function &#39;abspath&#39; is</span>
<span class="c1"># quicker than calling &#39;realpath&#39; because it would fork a whole process, which</span>
<span class="c1"># is slow. Second, we need to append a file list to sxiv, which can only be done</span>
<span class="c1"># properly in two ways: arrays (which are not POSIX) or \0 sperated</span>
<span class="c1"># strings. Unfortunately, assigning \0 to a variable is not POSIX either (will</span>
<span class="c1"># not work in dash and others), so we cannot store the result of listfiles to a</span>
<span class="c1"># variable.</span>

<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span><span class="nv">$#</span><span class="w"> </span>-eq<span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w">    </span><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Usage: </span><span class="si">${</span><span class="nv">0</span><span class="p">##*/</span><span class="si">}</span><span class="s2"> PICTURES&quot;</span>
<span class="w">    </span><span class="nb">exit</span>
<span class="k">fi</span>

<span class="o">[</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s1">&#39;--&#39;</span><span class="w"> </span><span class="o">]</span><span class="w"> </span><span class="o">&amp;&amp;</span><span class="w"> </span><span class="nb">shift</span>

abspath<span class="w"> </span><span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w">    </span><span class="k">case</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="w"> </span><span class="k">in</span>
<span class="w">        </span>/*<span class="o">)</span><span class="w"> </span><span class="nb">printf</span><span class="w"> </span><span class="s2">&quot;%s\n&quot;</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="p">;;</span>
<span class="w">        </span>*<span class="o">)</span><span class="w">  </span><span class="nb">printf</span><span class="w"> </span><span class="s2">&quot;%s\n&quot;</span><span class="w"> </span><span class="s2">&quot;</span><span class="nv">$PWD</span><span class="s2">/</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="p">;;</span>
<span class="w">    </span><span class="k">esac</span>
<span class="o">}</span>

listfiles<span class="w"> </span><span class="o">()</span><span class="w"> </span><span class="o">{</span>
<span class="w">    </span>find<span class="w"> </span>-L<span class="w"> </span><span class="s2">&quot;</span><span class="k">$(</span>dirname<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$target</span><span class="s2">&quot;</span><span class="k">)</span><span class="s2">&quot;</span><span class="w"> </span>-maxdepth<span class="w"> </span><span class="m">1</span><span class="w"> </span>-type<span class="w"> </span>f<span class="w"> </span>-iregex<span class="w"> </span><span class="se">\</span>
<span class="w">      </span><span class="s1">&#39;.*\(jpe?g\|bmp\|png\|gif\)$&#39;</span><span class="w"> </span>-print0<span class="w"> </span><span class="p">|</span><span class="w"> </span>sort<span class="w"> </span>-z
<span class="o">}</span>

<span class="nv">target</span><span class="o">=</span><span class="s2">&quot;</span><span class="k">$(</span>abspath<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$1</span><span class="s2">&quot;</span><span class="k">)</span><span class="s2">&quot;</span>
<span class="nv">count</span><span class="o">=</span><span class="s2">&quot;</span><span class="k">$(</span>listfiles<span class="w"> </span><span class="p">|</span><span class="w"> </span>grep<span class="w"> </span>-m<span class="w"> </span><span class="m">1</span><span class="w"> </span>-ZznF<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$target</span><span class="s2">&quot;</span><span class="w"> </span><span class="p">|</span><span class="w"> </span>cut<span class="w"> </span>-d:<span class="w"> </span>-f1<span class="k">)</span><span class="s2">&quot;</span>

<span class="k">if</span><span class="w"> </span><span class="o">[</span><span class="w"> </span>-n<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$count</span><span class="s2">&quot;</span><span class="w"> </span><span class="o">]</span><span class="p">;</span><span class="w"> </span><span class="k">then</span>
<span class="w">    </span>listfiles<span class="w"> </span><span class="p">|</span><span class="w"> </span>xargs<span class="w"> </span>-0<span class="w"> </span>sxiv<span class="w"> </span>-n<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$count</span><span class="s2">&quot;</span><span class="w"> </span>--
<span class="k">else</span>
<span class="w">    </span>sxiv<span class="w"> </span>--<span class="w"> </span><span class="s2">&quot;</span><span class="nv">$@</span><span class="s2">&quot;</span><span class="w"> </span><span class="c1"># fallback</span>
<span class="k">fi</span>
</pre></div>
</code></pre></div></td>
</tr>
</table>
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    .
  ]
  # fix the error, hit F4
  assume-console [
    left-click 3, 16
    press ctrl-k
    type [0]
    press F4
  ]
  event-loop screen, console, env, resources
  # no error anymore
  screen-should-contain [
    .                                                                                 run (F4)           .
    .recipe foo [                                      ┊                                                 .
    .  local-scope                                     ┊─────────────────────────────────────────────────.
    .  x:num <- copy 0                                 ┊0   edit       copy       to recipe    delete    .
    .]                                                 ┊foo                                              .
    .                                                  ┊─────────────────────────────────────────────────.
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
]

scenario scrolling-recipe-side-reveals-errors [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 5/height
  # recipe overflows recipe side
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe foo [|
      |  a:num <- copy 0|  # padding to overflow recipe side
      |  b:num <- copy 0|  # padding to overflow recipe side
      |  get 123:num, foo:offset|  # line containing error
      |]|
    ]
  ]
  env:&:environment <- new-programming-environment resources, screen, [foo]
  render-all screen, env, render
  # hit F4, generating errors, then scroll down
  assume-console [
    press F4
    press page-down
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # errors should be displayed
  screen-should-contain [
    .  errors found                                                                   run (F4)           .
    .  get 123:num, foo:offset                         ┊foo                                              .
    .\\]                                                 ┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
    .foo: unknown element 'foo' in container 'number'  ┊                                                 .
  ]
]

scenario run-instruction-and-print-errors [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 10/height
  assume-resources [
  ]
  # sandbox editor contains an illegal instruction
  env:&:environment <- new-programming-environment resources, screen, [get 1234:num, foo:offset]
  render-all screen, env, render
  assume-console [
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # check that screen prints error message in red
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .                                                  ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
    .                                                  ┊0   edit       copy       to recipe    delete    .
    .                                                  ┊get 1234:num, foo:offset                         .
    .                                                  ┊unknown element 'foo' in container 'number'      .
    .                                                  ┊first ingredient of 'get' should be a container,↩.
    .                                                  ┊ but got '1234:num'                              .
    .                                                  ┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
  ]
  screen-should-contain-in-color 7/white, [
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                   get 1234:num, foo:offset                         .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
  ]
  screen-should-contain-in-color 1/red, [
    .  errors found (0)                                                                                  .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                                                                    .
    .                                                   unknown element 'foo' in container 'number'      .
    .                                                   first ingredient of 'get' should be a container, .
    .                                                    but got '1234:num'                              .
    .                                                                                                    .
  ]
  screen-should-contain-in-color 245/grey, [
    .                                                                                                    .
    .                                                  ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
    .                                                  ┊                                                 .
    .                                                  ┊                                                 .
    .                                                  ┊                                                ↩.
    .                                                  ┊                                                 .
    .                                                  ┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
  ]
]

scenario run-instruction-and-print-errors-only-once [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 10/height
  assume-resources [
  ]
  # sandbox editor contains an illegal instruction
  env:&:environment <- new-programming-environment resources, screen, [get 1234:num, foo:offset]
  render-all screen, env, render
  # run the code in the editors multiple times
  assume-console [
    press F4
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # check that screen prints error message just once
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .                                                  ┊                                                 .
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊─────────────────────────────────────────────────.
    .                                                  ┊0   edit       copy       to recipe    delete    .
    .                                                  ┊get 1234:num, foo:offset                         .
    .                                                  ┊unknown element 'foo' in container 'number'      .
    .                                                  ┊first ingredient of 'get' should be a container,↩.
    .                                                  ┊ but got '1234:num'                              .
    .                                                  ┊─────────────────────────────────────────────────.
    .                                                  ┊                                                 .
  ]
]

scenario sandbox-can-handle-infinite-loop [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 20/height
  # sandbox editor will trigger an infinite loop
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe foo [|
      |  {|
      |    loop|
      |  }|
      |]|
    ]
  ]
  env:&:environment <- new-programming-environment resources, screen, [foo]
  render-all screen, env, render
  # run the sandbox
  assume-console [
    press F4
  ]
  run [
    event-loop screen, console, env, resources
  ]
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .recipe foo [                                      ┊                                                 .
    .  {                                               ┊─────────────────────────────────────────────────.
    .    loop                                          ┊0   edit       copy       to recipe    delete    .
    .  }                                               ┊foo                                              .
    .]                                                 ┊took too long!                                   .
    .                                                  ┊─────────────────────────────────────────────────.
    .┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┊                                                 .
    .                                                  ┊                                                 .
  ]
]

scenario sandbox-with-errors-shows-trace [
  local-scope
  trace-until 100/app  # trace too long
  assume-screen 100/width, 10/height
  # generate a stash and a error
  assume-resources [
    [lesson/recipes.mu] <- [
      |recipe foo [|
      |  local-scope|
      |  a:num <- next-ingredient|
      |  b:num <- next-ingredient|
      |  stash [dividing by], b|
      |  _, c:num <- divide-with-remainder a, b|
      |  reply b|
      |]|
    ]
  ]
  env:&:environment <- new-programming-environment resources, screen, [foo 4, 0]
  render-all screen, env, render
  # run
  assume-console [
    press F4
  ]
  event-loop screen, console, env, resources
  # screen prints error message
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .recipe foo [                                      ┊                                                 .
    .  local-scope                                     ┊─────────────────────────────────────────────────.
    .  a:num <- next-ingredient                        ┊0   edit       copy       to recipe    delete    .
    .  b:num <- next-ingredient                        ┊foo 4, 0                                         .
    .  stash [dividing by], b                          ┊foo: divide by zero in '_, c:num <- divide-with-↩.
    .  _, c:num <- divide-with-remainder a, b          ┊remainder a, b'                                  .
    .  reply b                                         ┊─────────────────────────────────────────────────.
    .]                                                 ┊                                                 .
    .                                                  ┊                                                 .
  ]
  # click on the call in the sandbox
  assume-console [
    left-click 4, 55
  ]
  run [
    event-loop screen, console, env, resources
  ]
  # screen should expand trace
  screen-should-contain [
    .  errors found (0)                                                               run (F4)           .
    .recipe foo [                                      ┊                                                 .
    .  local-scope                                     ┊─────────────────────────────────────────────────.
    .  a:num <- next-ingredient                        ┊0   edit       copy       to recipe    delete    .
    .  b:num <- next-ingredient                        ┊foo 4, 0                                         .
    .  stash [dividing by], b                          ┊dividing by 0                                    .
    .  _, c:num <- divide-with-remainder a, b          ┊14 instructions run                              .
    .  reply b                                         ┊foo: divide by zero in '_, c:num <- divide-with-↩.
    .]                                                 ┊remainder a, b'                                  .
    .                                                  ┊─────────────────────────────────────────────────.
  ]
]
