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import { dirname, join, relative } from "@std/path";
import { copySync, existsSync, walkSync } from "@std/fs";
import { parse } from "@std/dotenv";
import { distinct } from "@std/collections";
// @ts-types="npm:@types/mustache"
import Mustache from "mustache";
import { defineYargsModule, DEMAND_COMMAND_MESSAGE } from "./yargs.ts";
const MUSTACHE_RENDER_OPTIONS: Mustache.RenderOptions = {
tags: ["@@", "@@"],
escape: (value: unknown) => String(value),
};
function mustacheParse(template: string) {
return Mustache.parse(template, MUSTACHE_RENDER_OPTIONS.tags);
}
function mustacheRender(template: string, view: Record<string, string>) {
return Mustache.render(template, view, {}, MUSTACHE_RENDER_OPTIONS);
}
function getVariableKeysOfTemplate(template: string): string[] {
return distinct(
mustacheParse(template)
.filter((v) => v[0] === "name")
.map((v) => v[1]),
);
}
function loadTemplatedConfigFiles(
files: string[],
): Record<string, string> {
console.log("Scan config files ...");
const config: Record<string, string> = {};
for (const file of files) {
console.log(` from file ${file}`);
const text = Deno.readTextFileSync(file);
for (const [key, valueText] of Object.entries(parse(text))) {
// TODO: dotenv silently override old values, so everything will be new for now.
console.log(` (${key in config ? "override" : "new"}) ${key}`);
getVariableKeysOfTemplate(valueText).forEach((name) => {
if (!(name in config)) {
throw new Error(
`Variable ${name} is not defined yet, perhaps due to typos or wrong order.`,
);
}
});
config[key] = mustacheRender(valueText, config);
}
}
return config;
}
const TEMPLATE_FILE_EXT = ".template";
class TemplateDir {
templates: { path: string; ext: string; text: string; vars: string[] }[] = [];
plains: { path: string }[] = [];
constructor(public dir: string) {
console.log(`Scan template dir ${dir} ...`);
Array.from(
walkSync(dir, { includeDirs: false, followSymlinks: true }),
).forEach(({ path }) => {
path = relative(this.dir, path);
if (path.endsWith(TEMPLATE_FILE_EXT)) {
console.log(` (template) ${path}`);
const text = Deno.readTextFileSync(join(dir, path));
this.templates.push({
path,
ext: TEMPLATE_FILE_EXT,
text,
vars: getVariableKeysOfTemplate(text),
});
} else {
console.log(` (plain) ${path}`);
this.plains.push({ path });
}
});
}
allNeededVars() {
return distinct(this.templates.flatMap((t) => t.vars));
}
generate(vars: Record<string, string>, generatedDir?: string) {
console.log(
`Generate to dir ${generatedDir ?? "[dry-run]"} ...`,
);
const undefinedVars = this.allNeededVars().filter((v) => !(v in vars));
if (undefinedVars.length !== 0) {
throw new Error(
`Needed variables are not defined: ${undefinedVars.join(", ")}`,
);
}
if (generatedDir != null) {
if (existsSync(generatedDir)) {
console.log(` delete old generated dir`);
Deno.removeSync(generatedDir, { recursive: true });
}
for (const file of this.plains) {
const [source, destination] = [
join(this.dir, file.path),
join(generatedDir, file.path),
];
console.log(` copy ${file.path}`);
Deno.mkdirSync(dirname(destination), { recursive: true });
copySync(source, destination);
}
for (const file of this.templates) {
const path = file.path.slice(0, -file.ext.length);
const destination = join(generatedDir, path);
console.log(` generate ${path}`);
const rendered = mustacheRender(file.text, vars);
Deno.mkdirSync(dirname(destination), { recursive: true });
Deno.writeTextFileSync(destination, rendered);
}
}
}
}
export default defineYargsModule({
command: "service",
aliases: ["sv"],
describe: "Manage services.",
builder: (builder) => {
return builder
.option("project-dir", {
type: "string",
})
.demandOption("project-dir")
.command({
command: "gen-tmpl",
describe: "Generate files from templates",
builder: (builder) => {
return builder
.option("dry-run", {
type: "boolean",
default: true,
})
.strict();
},
handler: (argv) => {
const { projectDir, dryRun } = argv;
const config = loadTemplatedConfigFiles(
[
join(projectDir, "data/config"),
join(projectDir, "services/config.template"),
],
);
new TemplateDir(
join(projectDir, "services/templates"),
).generate(
config,
dryRun ? undefined : join(projectDir, "services/generated"),
);
console.log("Done!");
},
})
.demandCommand(1, DEMAND_COMMAND_MESSAGE);
},
handler: () => {},
});
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