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/** @format */
// Code that deals with URLs (really the pathnames that get referenced all
// throughout the gener8ted HTML). Most nota8ly here is generateURLs, which
// is in charge of pre-gener8ting a complete network of template strings
// which can really quickly take su8stitute parameters to link from any one
// place to another; 8ut there are also a few other utilities, too.
//
// Nota8ly, everything here is string-8ased, for gener8ting and transforming
// actual path strings. More a8stract operations using wiki data o8jects is
// the domain of link.js.
import * as path from 'path';
import {withEntries} from './sugar.js';
export function generateURLs(urlSpec) {
const getValueForFullKey = (obj, fullKey, prop = null) => {
const [groupKey, subKey] = fullKey.split('.');
if (!groupKey || !subKey) {
throw new Error(`Expected group key and subkey (got ${fullKey})`);
}
if (!obj.hasOwnProperty(groupKey)) {
throw new Error(`Expected valid group key (got ${groupKey})`);
}
const group = obj[groupKey];
if (!group.hasOwnProperty(subKey)) {
throw new Error(
`Expected valid subkey (got ${subKey} for group ${groupKey})`
);
}
return {
value: group[subKey],
group,
};
};
// This should be called on values which are going to be passed to
// path.relative, because relative will resolve a leading slash as the root
// directory of the working device, which we aren't looking for here.
const trimLeadingSlash = (P) => (P.startsWith('/') ? P.slice(1) : P);
const generateTo = (fromPath, fromGroup) => {
const A = trimLeadingSlash(fromPath);
const rebasePrefix = '../'.repeat(
(fromGroup.prefix || '').split('/').filter(Boolean).length
);
const pathHelper = (toPath, toGroup) => {
let B = trimLeadingSlash(toPath);
let argIndex = 0;
B = B.replaceAll('<>', () => `<${argIndex++}>`);
if (toGroup.prefix !== fromGroup.prefix) {
// TODO: Handle differing domains in prefixes.
B = rebasePrefix + (toGroup.prefix || '') + B;
}
const suffix = toPath.endsWith('/') ? '/' : '';
return {
posix: path.posix.relative(A, B) + suffix,
device: path.relative(A, B) + suffix,
};
};
const groupSymbol = Symbol();
const groupHelper = (urlGroup) => ({
[groupSymbol]: urlGroup,
...withEntries(urlGroup.paths, (entries) =>
entries.map(([key, path]) => [key, pathHelper(path, urlGroup)])
),
});
const relative = withEntries(urlSpec, (entries) =>
entries.map(([key, urlGroup]) => [key, groupHelper(urlGroup)])
);
const toHelper =
(delimiterMode) =>
(key, ...args) => {
const {
value: {[delimiterMode]: template},
} = getValueForFullKey(relative, key);
let missing = 0;
let result = template.replaceAll(/<([0-9]+)>/g, (match, n) => {
if (n < args.length) {
return args[n];
} else {
missing++;
}
});
if (missing) {
throw new Error(
`Expected ${missing + args.length} arguments, got ${
args.length
} (key ${key}, args [${args}])`
);
}
return result;
};
return {
to: toHelper('posix'),
toDevice: toHelper('device'),
};
};
const generateFrom = () => {
const map = withEntries(urlSpec, (entries) =>
entries.map(([key, group]) => [
key,
withEntries(group.paths, (entries) =>
entries.map(([key, path]) => [key, generateTo(path, group)])
),
])
);
const from = (key) => getValueForFullKey(map, key).value;
return {from, map};
};
return generateFrom();
}
const thumbnailHelper = (name) => (file) =>
file.replace(/\.(jpg|png)$/, name + '.jpg');
export const thumb = {
medium: thumbnailHelper('.medium'),
small: thumbnailHelper('.small'),
};
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