Refresh Math blocks when new exchange rates are loaded

README.md

@@ -27,6 +27,7 @@ Available for Mac and Windows. Linux support coming soon (hopefully).
 -   Language auto-detection
 -   Auto-formatting
 -   Math/Calculator mode
+-   Currency conversion
 -   Multi-cursor editing
 -   Dark & Light themes
 -   Default or Emacs-like key bindings

electron/initial-content.ts

@@ -22,11 +22,13 @@ radius = 5
 volume = radius^2 * PI
 sqrt(9)
 
-It also supports some basic unit conversions:
+It also supports some basic unit conversions, including currencies:
 
 13 inches in cm
 time = 3900 seconds to minutes
 time * 2
+
+1 EUR in USD
 ∞∞∞markdown
 In Markdown blocks, lists with [x] and [ ] are rendered as checkboxes:
 
@@ -120,3 +122,4 @@ Shopping list:
 - Eggs
 - Bread
 - Cheese`
+

src/components/Editor.vue

@@ -54,6 +54,7 @@
                     showLineNumberGutter: this.showLineNumberGutter,
                     showFoldGutter: this.showFoldGutter,
                 })
+                window.document.addEventListener("currenciesLoaded", this.onCurrenciesLoaded)
             })
             // set up window close handler that will save the buffer and quit
             window.heynote.onWindowClose(() => {
@@ -80,6 +81,10 @@
             }
         },
 
+        beforeUnmount() {
+            window.document.removeEventListener("currenciesLoaded", this.onCurrenciesLoaded)
+        },
+
         watch: {
             theme(newTheme) {
                 this.editor.setTheme(newTheme)
@@ -113,6 +118,10 @@
                 this.editor.focus()
             },
 
+            onCurrenciesLoaded() {
+                this.editor.currenciesLoaded()
+            },
+
             focus() {
                 this.editor.focus()
             },

src/currency.js

@@ -14,4 +14,5 @@ export async function loadCurrencies() {
             }, {override: currenciesLoaded})
         })
     currenciesLoaded = true
+    window.document.dispatchEvent(new Event("currenciesLoaded"))
 }

src/editor/annotation.js

@@ -2,4 +2,5 @@ import { Annotation } from "@codemirror/state"
 
 export const heynoteEvent = Annotation.define()
 export const LANGUAGE_CHANGE = "heynote-change"
+export const CURRENCIES_LOADED = "heynote-currencies-loaded"
 

src/editor/block/commands.js

@@ -4,7 +4,7 @@ import {
     selectAll as defaultSelectAll, 
     moveLineUp as defaultMoveLineUp,
 } from "@codemirror/commands"
-import { heynoteEvent, LANGUAGE_CHANGE } from "../annotation.js";
+import { heynoteEvent, LANGUAGE_CHANGE, CURRENCIES_LOADED } from "../annotation.js";
 import { blockState, getActiveNoteBlock, getNoteBlockFromPos } from "./block"
 import { levenshtein_distance } from "../language-detection/levenshtein"
 import { moveLineDown, moveLineUp } from "./move-lines.js";
@@ -277,3 +277,12 @@ export function newCursorBelow(view) {
 export function newCursorAbove(view) {
     newCursor(view, false)
 }
+
+export function triggerCurrenciesLoaded(state, dispatch) {
+    // Trigger empty change transaction that is annotated with CURRENCIES_LOADED
+    // This will make Math blocks re-render so that currency conversions are applied
+    dispatch(state.update({
+        changes:{from: 0, to: 0, insert:""},
+        annotations: [heynoteEvent.of(CURRENCIES_LOADED)],
+    }))
+}

src/editor/block/math.js

@@ -4,6 +4,7 @@ import { RangeSetBuilder } from "@codemirror/state"
 import { WidgetType } from "@codemirror/view"
 
 import { getNoteBlockFromPos } from "./block"
+import { CURRENCIES_LOADED } from "../annotation"
 
 
 class MathResult extends WidgetType {
@@ -84,6 +85,11 @@ function mathDeco(view) {
 }
 
 
+// This function checks if any of the transactions has the given annotation
+const transactionsHasAnnotation = (transactions, annotation) => {
+    return transactions.some(tr => tr.annotations.some(a => a.value === annotation))
+}
+
 export const mathBlock = ViewPlugin.fromClass(class {
     decorations
 
@@ -92,7 +98,10 @@ export const mathBlock = ViewPlugin.fromClass(class {
     }
 
     update(update) {
-        if (update.docChanged || update.viewportChanged) {
+        // If the document changed, the viewport changed, or the transaction was annotated with the CURRENCIES_LOADED annotation, 
+        // update the decorations. The reason we need to check for CURRENCIES_LOADED annotations is because the currency rates are 
+        // updated asynchronously
+        if (update.docChanged || update.viewportChanged || transactionsHasAnnotation(update.transactions, CURRENCIES_LOADED)) {
             this.decorations = mathDeco(update.view)
         }
     }

src/editor/editor.js

@@ -9,7 +9,7 @@ import { heynoteBase } from "./theme/base.js"
 import { customSetup } from "./setup.js"
 import { heynoteLang } from "./lang-heynote/heynote.js"
 import { noteBlockExtension, blockLineNumbers } from "./block/block.js"
-import { changeCurrentBlockLanguage } from "./block/commands.js"
+import { changeCurrentBlockLanguage, triggerCurrenciesLoaded } from "./block/commands.js"
 import { formatBlockContent } from "./block/format-code.js"
 import { heynoteKeymap } from "./keymap.js"
 import { emacsKeymap } from "./emacs.js"
@@ -147,6 +147,10 @@ export class HeynoteEditor {
             dispatch: this.view.dispatch,
         })
     }
+
+    currenciesLoaded() {
+        triggerCurrenciesLoaded(this.view.state, this.view.dispatch)
+    }
 }