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Creates a handlebars instance per invocation of load Templates. #435

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Creates a handlebars instance per invocation of load Templates. #435

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99 changes: 51 additions & 48 deletions lib/templates.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,47 +4,6 @@ import handlebars from 'handlebars';

const dateFormatter = new Intl.DateTimeFormat('en-GB', { dateStyle: 'full', timeZone: 'UTC' });

// A helper to turn a datetime into a human readable string.
handlebars.registerHelper('humanDate', stamp => dateFormatter.format(new Date(stamp)));
handlebars.registerHelper('humanDateTime', (stamp, timeZone) => {
return new Intl.DateTimeFormat('en-GB', { dateStyle: 'full', timeStyle: 'long', timeZone }).format(new Date(stamp));
});
handlebars.registerHelper('navElement', function (url, name) {
const escapedName = handlebars.escapeExpression(name);

if (url === this.localUrl) { // eslint-disable-line no-invalid-this
return escapedName;
}

const escapedUrl = handlebars.escapeExpression(url);

return new handlebars.SafeString(`<a href="${escapedUrl}">${escapedName}</a>`);
});
handlebars.registerHelper('encodeUriComponent', encodeURIComponent);

// A helper to turn a datetime into an ISO string (without milliseconds).
handlebars.registerHelper('isoDate', datetime => new Date(datetime)
.toISOString()
.replace(/\.\d{3}Z/, 'Z')
);

handlebars.registerHelper('initialUpper', string => string[0].toUpperCase() + string.slice(1));

const year = new Date().getUTCFullYear();

handlebars.registerHelper('year', () => year);

handlebars.registerHelper('hash', (field, chars) => {
return createHash('sha256')
.update(field)
.digest('hex')
.slice(0, chars);
});

handlebars.registerHelper('ifeq', function (a, b, { fn, inverse }) {
return a === b ? fn(this) : inverse(this); // eslint-disable-line no-invalid-this
});

function makePicker(list) {
let filtered = list;

Expand All @@ -58,18 +17,62 @@ function makePicker(list) {
};
}

handlebars.registerHelper('lightEmoji', makePicker(['🌴', '☀️', '🕶', '🐬', '🦜', '🍉']));
handlebars.registerHelper('darkEmoji', makePicker(['⭐️', '🌙', '🍹', '🌴', '🎷']));

async function getTemplateAndName(directory, filename) {
const source = await readFile(new URL(filename, directory), 'utf8');
const name = filename.slice(0, filename.lastIndexOf('.', filename.length - 12)); // trim off .ext.handlebars

return [name, source.trim()];
}

export default async function loadTemplates(dir, { baseTitle }) {
handlebars.registerHelper('baseTitle', () => baseTitle);
export default async function loadTemplates(dir, { baseTitle: title }) {
const fullYear = new Date().getUTCFullYear();
const bars = handlebars.create();

bars.registerHelper({
baseTitle() {
return title;
},
lightEmoji: makePicker(['🌴', '☀️', '🕶', '🐬', '🦜', '🍉']),
darkEmoji: makePicker(['⭐️', '🌙', '🍹', '🌴', '🎷']),
ifeq(a, b, { fn, inverse }) {
return a === b ? fn(this) : inverse(this); // eslint-disable-line no-invalid-this
},
hash(field, chars) {
return createHash('sha256')
.update(field)
.digest('hex')
.slice(0, chars);
},
year() {
return fullYear;
},
initialUpper(string) {
return string[0].toUpperCase() + string.slice(1);
},
isoDate(datetime) {
return new Date(datetime)
.toISOString()
.replace(/\.\d{3}Z/, 'Z');
},
encodeUriComponent: encodeURIComponent,
navElement(url, name) {
const escapedName = bars.escapeExpression(name);

if (url === this.localUrl) { // eslint-disable-line no-invalid-this
return escapedName;
}

const escapedUrl = bars.escapeExpression(url);

return new bars.SafeString(`<a href="${escapedUrl}">${escapedName}</a>`);
},
humanDateTime(stamp, timeZone) {
return new Intl.DateTimeFormat('en-GB', { dateStyle: 'full', timeStyle: 'long', timeZone }).format(new Date(stamp));
},
humanDate(stamp) {
return dateFormatter.format(new Date(stamp));
}
});

const partialsPath = new URL('partials/', dir);
const templatesPath = new URL('documents/', dir);
Expand All @@ -89,13 +92,13 @@ export default async function loadTemplates(dir, { baseTitle }) {
return Promise.all(partialFilenames.map(async n => {
const [name, source] = await getTemplateAndName(partialsPath, n);

handlebars.registerPartial(name, source);
bars.registerPartial(name, source);
}));
})
]);

for (const [name, source] of documentsSources) {
templates[name] = handlebars.compile(source);
templates[name] = bars.compile(source);
}

return templates;
Expand Down