feat: please, work.

package-lock.json

@@ -34,7 +34,8 @@
         "rollup-plugin-svelte": "^7.0.0",
         "rollup-plugin-terser": "^7.0.0",
         "svelte": "^3.0.0",
-        "svelte-fullcalendar": "^1.1.1"
+        "svelte-fullcalendar": "^1.1.1",
+        "svelte-reactive-preprocessor": "^0.8.0"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -325,6 +326,18 @@
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       "dev": true
     },
+    "node_modules/acorn": {
+      "version": "8.7.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.7.0.tgz",
+      "integrity": "sha512-V/LGr1APy+PXIwKebEWrkZPwoeoF+w1jiOBUmuxuiUIaOHtob8Qc9BTrYo7VuI5fR8tqsy+buA2WFooR5olqvQ==",
+      "dev": true,
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -1610,6 +1623,12 @@
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       "dev": true
     },
+    "node_modules/json-stringify-safe": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
+      "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
+      "dev": true
+    },
     "node_modules/json5": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
@@ -1673,6 +1692,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/linenumber": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/linenumber/-/linenumber-1.0.1.tgz",
+      "integrity": "sha512-g7x+bxzGaJ7yUk1chFXmY4NT1oIiSQREUs33M29cjDPFUP1W/dlM3YGD1cR7qeSehp5TEpxAFP0L+Rpk3nUKzw==",
+      "dev": true
+    },
     "node_modules/livereload": {
       "version": "0.9.3",
       "resolved": "https://registry.npmjs.org/livereload/-/livereload-0.9.3.tgz",
@@ -1967,6 +1992,16 @@
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       "dev": true
     },
+    "node_modules/periscopic": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/periscopic/-/periscopic-2.0.3.tgz",
+      "integrity": "sha512-FuCZe61mWxQOJAQFEfmt9FjzebRlcpFz8sFPbyaCKtdusPkMEbA9ey0eARnRav5zAhmXznhaQkKGFAPn7X9NUw==",
+      "dev": true,
+      "dependencies": {
+        "estree-walker": "^2.0.2",
+        "is-reference": "^1.1.4"
+      }
+    },
     "node_modules/picocolors": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.0.tgz",
@@ -3404,6 +3439,31 @@
         "@fullcalendar/interaction": "^5.0.0"
       }
     },
+    "node_modules/svelte-reactive-preprocessor": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/svelte-reactive-preprocessor/-/svelte-reactive-preprocessor-0.8.0.tgz",
+      "integrity": "sha512-gh24HA44avC+WcEUHdd8P76HtkeXW2YdF6iE72r+yowr6OMXOo509zKjydEcpwIFjzilcN4zIlRiy8/k9ba0BA==",
+      "dev": true,
+      "dependencies": {
+        "acorn": "^8.0.4",
+        "escape-string-regexp": "^4.0.0",
+        "json-stringify-safe": "^5.0.1",
+        "linenumber": "^1.0.1",
+        "periscopic": "^2.0.3"
+      }
+    },
+    "node_modules/svelte-reactive-preprocessor/node_modules/escape-string-regexp": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",
+      "integrity": "sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/svelte-simple-modal": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/svelte-simple-modal/-/svelte-simple-modal-1.3.1.tgz",
@@ -3897,6 +3957,12 @@
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       "dev": true
     },
+    "acorn": {
+      "version": "8.7.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.7.0.tgz",
+      "integrity": "sha512-V/LGr1APy+PXIwKebEWrkZPwoeoF+w1jiOBUmuxuiUIaOHtob8Qc9BTrYo7VuI5fR8tqsy+buA2WFooR5olqvQ==",
+      "dev": true
+    },
     "ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
@@ -4904,6 +4970,12 @@
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       "dev": true
     },
+    "json-stringify-safe": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
+      "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
+      "dev": true
+    },
     "json5": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
@@ -4956,6 +5028,12 @@
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       "dev": true
     },
+    "linenumber": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/linenumber/-/linenumber-1.0.1.tgz",
+      "integrity": "sha512-g7x+bxzGaJ7yUk1chFXmY4NT1oIiSQREUs33M29cjDPFUP1W/dlM3YGD1cR7qeSehp5TEpxAFP0L+Rpk3nUKzw==",
+      "dev": true
+    },
     "livereload": {
       "version": "0.9.3",
       "resolved": "https://registry.npmjs.org/livereload/-/livereload-0.9.3.tgz",
@@ -5178,6 +5256,16 @@
       "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
       "dev": true
     },
+    "periscopic": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/periscopic/-/periscopic-2.0.3.tgz",
+      "integrity": "sha512-FuCZe61mWxQOJAQFEfmt9FjzebRlcpFz8sFPbyaCKtdusPkMEbA9ey0eARnRav5zAhmXznhaQkKGFAPn7X9NUw==",
+      "dev": true,
+      "requires": {
+        "estree-walker": "^2.0.2",
+        "is-reference": "^1.1.4"
+      }
+    },
     "picocolors": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.0.0.tgz",
@@ -6208,6 +6296,27 @@
         "@fullcalendar/interaction": "^5.0.0"
       }
     },
+    "svelte-reactive-preprocessor": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/svelte-reactive-preprocessor/-/svelte-reactive-preprocessor-0.8.0.tgz",
+      "integrity": "sha512-gh24HA44avC+WcEUHdd8P76HtkeXW2YdF6iE72r+yowr6OMXOo509zKjydEcpwIFjzilcN4zIlRiy8/k9ba0BA==",
+      "dev": true,
+      "requires": {
+        "acorn": "^8.0.4",
+        "escape-string-regexp": "^4.0.0",
+        "json-stringify-safe": "^5.0.1",
+        "linenumber": "^1.0.1",
+        "periscopic": "^2.0.3"
+      },
+      "dependencies": {
+        "escape-string-regexp": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-4.0.0.tgz",
+          "integrity": "sha512-TtpcNJ3XAzx3Gq8sWRzJaVajRs0uVxA2YAkdb1jm2YkPz4G6egUFAyA3n5vtEIZefPk5Wa4UXbKuS5fKkJWdgA==",
+          "dev": true
+        }
+      }
+    },
     "svelte-simple-modal": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/svelte-simple-modal/-/svelte-simple-modal-1.3.1.tgz",

package.json

@@ -24,7 +24,8 @@
     "rollup-plugin-svelte": "^7.0.0",
     "rollup-plugin-terser": "^7.0.0",
     "svelte": "^3.0.0",
-    "svelte-fullcalendar": "^1.1.1"
+    "svelte-fullcalendar": "^1.1.1",
+    "svelte-reactive-preprocessor": "^0.8.0"
   },
   "dependencies": {
     "@fullcalendar/adaptive": "^5.10.1",

src/App.svelte

@@ -49,10 +49,10 @@
   });
 
   $: {
-    reloadEvents(selectedCalendars, options).then(events => {
+    /*reloadEvents(selectedCalendars, options).then(events => {
       options.events = events;
       options = { ...options };
-    });
+    });*/
   }
 </script>
 
@@ -60,7 +60,7 @@
   <h1 class="title">Calendrier de la vie étudiante à l'ENS</h1>
   <div style="height: 100%; display: flex;">
     <Modal show={$modal}>
-      <FilterBar {calendarTree} bind:selectedCalendars={selectedCalendars} />
+      <FilterBar {calendarTree} />
       <div style="flex: 1;">
         <FullCalendar bind:this={calendar} {options} />
       </div>

src/FilterBar.svelte

@@ -9,6 +9,6 @@
 
 <ul>
 {#each Object.entries(calendarTree) as [toplevel, subtrees], i}
-  <FilterItem item={toplevel} children={subtrees} bind:selected={subSelections[i]} />
+  <FilterItem item={toplevel} children={subtrees} />
 {/each}
 </ul>

src/FilterItem.svelte

@@ -1,42 +1,74 @@
 <script>
+  import { writable } from 'svelte/store';
+  import { tick } from 'svelte';
+
+  import TriStateCheckbox from './TriStateCheckbox.svelte';
+  import { createTriState, UNCHECKED, CHECKED, WEIRD } from './stores';
+
   export let item = null;
+
   export let children = [];
-  export let filtering = true;
   export let selected = [];
+  export let filtering = createTriState(CHECKED);
+  let subfiltering = Array(Object.keys(children).length).fill(createTriState(CHECKED));
 
-  let subfiltering = Object.entries(children).map(([k, v]) => v ? true : false);
   
-  function setAllSubFilters(value) {
+  function isVal(val) {
-    subfiltering = Object.entries(children).map(([k, v]) => value);
+    return function (other) {
-  }
+      return other === val;
-
-  function handleClick(evt) {
-    setAllSubFilters(evt.target.checked);
-  }
-
-  $: if (subfiltering.length > 0) {
-    filtering = subfiltering.every(Boolean);
-  }
-
-  $: {
-    const subselected = Object.entries(children).flatMap(([toplevel, _], index) => subfiltering[index] ? [toplevel] : []);
-    if (item != null && filtering) {
-      selected = [item, ...subselected];
-    } else {
-      selected = subselected;
     }
   }
+
+ 
+  subfiltering.forEach((subfilter, j) => {
+    subfilter.subscribe(subvalue => {
+      console.log('subfiltering', Object.entries(children)[j][0], 'newValue=', subvalue, 'prevValue=', subfiltering[j], '$filtering=', $filtering);
+      const others = subfiltering.filter((_, i) => i !== j);
+      const areAllOthers = others.every(isVal(CHECKED));
+      const isThereAny = !others.some(isVal(UNCHECKED));
+
+      tick().then(() => {
+        if (subvalue === CHECKED && areAllOthers && $filtering !== CHECKED) {
+          console.log('check $filtering');
+          filtering.setChecked();
+        } else if (subvalue === UNCHECKED && isThereAny && $filtering !== UNCHECKED) {
+          console.log('uncheck $filtering');
+          filtering.setUnchecked();
+        } else if (!areAllOthers && !isThereAny && $filtering !== WEIRD) {
+          console.log(Object.entries(children)[j][0], 'partial checking');
+          filtering.setWeird();
+        }
+      });
+    });
+  });
+
+
+  filtering.subscribe(value => {
+    console.log('filtering', item, 'newValue=', value, 'prevValue=', $filtering);
+    if (value !== $filtering) {
+      switch (value) {
+        case CHECKED:
+          subfiltering.forEach(subfilter => subfilter.setChecked());
+          break;
+        case UNCHECKED:
+          subfiltering.forEach(subfilter => subfilter.setUnchecked());
+          break;
+      }
+    }
+  });
+
 </script>
 
 {#if item != null}
 <li>
-  <input type="checkbox" bind:checked={filtering} on:click={handleClick} value={item}><span>{item}</span>
+<TriStateCheckbox bind:state={filtering} value={item} initialValue={true} />
+<span>{item}</span>
   <ul>
   {#each Object.entries(children) as [toplevel, subchildren], i}
     {#if subchildren}
       <svelte:self item={toplevel} children={subchildren} bind:filtering={subfiltering[i]} />
     {:else}
-      <svelte:self item={toplevel} />
+      <svelte:self item={toplevel} bind:filtering={subfiltering[i]} />
     {/if}
   {/each}
   </ul>

src/TriStateCheckbox.svelte

@@ -0,0 +1,33 @@
+<script>
+  export let initialValue;
+  export let state;
+  export let value;
+
+  import { createTriState, UNCHECKED, CHECKED, WEIRD } from './stores';
+   
+  let node;
+
+  state.subscribe(val => {
+    if (!node) return;
+
+    if (val === CHECKED) {
+      checkedValue = true;
+    } else if (val === UNCHECKED) {
+      checkedValue = false;
+    }
+
+    node.indeterminate = val === WEIRD;
+  });
+
+  function handleClick(evt) {
+    if (evt.target.checked) {
+      state.setChecked();
+    } else if (!evt.target.checked) {
+      state.setUnchecked();
+    }
+  }
+
+  let checkedValue = false;
+</script>
+
+<input type="checkbox" checked={checkedValue} on:click={handleClick} bind:this={node} value={value} />

src/stores.js

@@ -0,0 +1,18 @@
+import { writable } from 'svelte/store';
+
+export const UNCHECKED = 0;
+export const CHECKED = 1;
+export const WEIRD = 2;
+
+export function createTriState(initialValue) {
+    const { subscribe, set } = writable(initialValue);
+
+  return {
+    subscribe,
+    setUnchecked: () => set(UNCHECKED),
+    setWeird: () => set(WEIRD),
+    setChecked: () => set(CHECKED),
+    set
+  }
+}
+