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// Copyright 2022 Jo-Philipp Wich <jo@mein.io>
// Licensed to the public under the Apache License 2.0.
import { access, basename } from 'fs';
import { cursor } from 'uci';
const template_directory = '/usr/share/ucode/luci/template';
function cut_message(msg) {
return trim(replace(msg, /\n--\n.*$/, ''));
}
function format_nested_exception(ex) {
let msg = replace(cut_message(ex.message), /(\n+( \|[^\n]*(\n|$))+)/, (m, m1) => {
m1 = replace(m1, /(^|\n) \| ?/g, '$1');
m = match(m1, /^(.+?)\n(In.*line \d+, byte \d+:.+)$/);
return `
<div class="exception">
<div class="message">${cut_message(m ? m[1] : m1)}</div>
${m ? `<pre class="context">${trim(m[2])}</pre>` : ''}
</div>
`;
});
return `
<div class="exception">
<div class="message">${cut_message(msg)}</div>
<pre class="context">${trim(ex.stacktrace[0].context)}</pre>
</div>
`;
}
function format_lua_exception(ex) {
let m = match(ex.message, /^(.+)\nstack traceback:\n(.+)$/);
return `
<div class="exception">
<div class="message">${cut_message(m ? m[1] : ex.message)}</div>
<pre class="context">${m ? trim(replace(m[2], /(^|\n)\t/g, '$1')) : ex.stacktrace[0].context}</pre>
</div>
`;
}
const Class = {
init_lua: function(optional) {
if (!this.L) {
let bridge = this.env.dispatcher.load_luabridge(optional);
if (bridge) {
let http = this.env.http;
this.L = bridge.create();
this.L.set('L', proto({ write: (...args) => http.closed || print(...args) }, this.env));
this.L.invoke('require', 'luci.ucodebridge');
this.env.lua_active = true;
}
}
return this.L;
},
render_ucode: function(path, scope) {
let tmplfunc = loadfile(path, { raw_mode: false });
if (this.env.http.closed)
render(call, tmplfunc, null, scope ?? {});
else
call(tmplfunc, null, scope ?? {});
},
render_lua: function(path, scope) {
let vm = this.init_lua();
let render = vm.get('_G', 'luci', 'ucodebridge', 'render');
render.call(path, scope ?? {});
},
trycompile: function(path) {
let ucode_path = `${template_directory}/${path}.ut`;
if (access(ucode_path)) {
try {
loadfile(ucode_path, { raw_mode: false });
}
catch (ucode_err) {
return `Unable to compile '${path}' as ucode template: ${format_nested_exception(ucode_err)}`;
}
}
else {
try {
let vm = this.init_lua(true);
if (vm)
vm.get('_G', 'luci', 'ucodebridge', 'compile').call(path);
else
return `Unable to compile '${path}' as Lua template: Unable to load Lua runtime`;
}
catch (lua_err) {
return `Unable to compile '${path}' as Lua template: ${format_lua_exception(lua_err)}`;
}
}
return true;
},
render_any: function(path, scope) {
let ucode_path = `${template_directory}/${path}.ut`;
scope = proto(scope ?? {}, this.scopes[-1]);
push(this.scopes, scope);
try {
if (access(ucode_path))
this.render_ucode(ucode_path, scope);
else
this.render_lua(path, scope);
}
catch (ex) {
pop(this.scopes);
die(ex);
}
pop(this.scopes);
},
render: function(path, scope) {
let self = this;
this.env.http.write(render(() => self.render_any(path, scope)));
},
call: function(modname, method, ...args) {
let vm = this.init_lua();
let lcall = vm.get('_G', 'luci', 'ucodebridge', 'call');
return lcall.call(modname, method, ...args);
}
};
export default function(env) {
const self = proto({ env: env ??= {}, scopes: [ proto(env, global) ], global }, Class);
const uci = cursor();
// determine theme
let media = uci.get('luci', 'main', 'mediaurlbase');
let status = self.trycompile(`themes/${basename(media)}/header`);
if (status !== true) {
media = null;
self.env.media_error = status;
for (let k, v in uci.get_all('luci', 'themes')) {
if (substr(k, 0, 1) != '.') {
status = self.trycompile(`themes/${basename(v)}/header`);
if (status === true) {
media = v;
break;
}
}
}
if (!media)
error500(`Unable to render any theme header template, last error was:\n${status}`);
}
self.env.media = media;
self.env.theme = basename(media);
self.env.resource = uci.get('luci', 'main', 'resourcebase');
self.env.include = (...args) => self.render_any(...args);
return self;
};
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