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// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
.pragma library
// Pure helpers for desktop-assistant's config.toml, tested by
// test_config.js under node.
//
// The file is edited line by line so its comments survive: the example it
// is copied from documents every key in place. Only the shapes this page
// writes are understood: top-level `key = value` before the first table,
// and `KEY = "value"` lines in [env]. A top-level key that is unset sits
// commented out (`# key = value`), which is how the example ships, so
// setting one activates its line and unsetting comments it back out.
// ponytail: no multi-line strings or arrays; the page never writes one,
// and Save validates the whole file with tomllib before writing.
const KEY = /^(\s*)(#\s*)?([A-Za-z_][A-Za-z0-9_]*)\s*=\s*(.*)$/;
const HEADER = /^\s*\[/;
function quote(s) {
return '"' + String(s).replace(/[\\"]/g, c => "\\" + c)
.replace(/\n/g, "\\n").replace(/\t/g, "\\t").replace(/\r/g, "\\r") + '"';
}
// The value at the start of rest and where it ends, so what follows (an
// inline comment) can be kept.
function value(rest) {
if (rest.startsWith('"')) {
let out = "";
for (let i = 1; i < rest.length; i++) {
const c = rest[i];
if (c === '"') return { v: out, end: i + 1 };
if (c === "\\" && i + 1 < rest.length) {
const n = rest[++i];
out += n === "n" ? "\n" : n === "t" ? "\t" : n === "r" ? "\r" : n;
} else out += c;
}
return { v: out, end: rest.length };
}
const m = /^[^\s#]*/.exec(rest)[0];
const v = m === "true" ? true : m === "false" ? false
: m !== "" && !isNaN(Number(m)) ? Number(m) : m;
return { v: v, end: m.length };
}
function firstHeader(lines) {
const i = lines.findIndex(l => HEADER.test(l) && !/^\s*#/.test(l));
return i < 0 ? lines.length : i;
}
// {key: value} for the active top-level keys among keys.
function scalars(text, keys) {
const lines = text.split("\n");
const out = {};
for (let i = 0; i < firstHeader(lines); i++) {
const m = KEY.exec(lines[i]);
if (m && !m[2] && keys.includes(m[3])) out[m[3]] = value(m[4]).v;
}
return out;
}
// toml is the value already written as TOML (quote() for a string), or null
// to unset.
function setScalar(text, key, toml) {
const lines = text.split("\n");
const end = firstHeader(lines);
let commented = -1;
for (let i = 0; i < end; i++) {
const m = KEY.exec(lines[i]);
if (!m || m[3] !== key) continue;
if (!m[2]) {
const tail = m[4].slice(value(m[4]).end);
lines[i] = toml === null ? m[1] + "# " + key + " = " + m[4]
: m[1] + key + " = " + toml + tail;
return lines.join("\n");
}
if (commented < 0) commented = i;
}
if (toml === null) return text;
if (commented >= 0) {
const m = KEY.exec(lines[commented]);
lines[commented] = m[1] + key + " = " + toml + m[4].slice(value(m[4]).end);
} else {
// Before the blank line that separates the first table, if any.
const at = end > 0 && lines[end - 1].trim() === "" ? end - 1 : end;
lines.splice(at, 0, key + " = " + toml);
}
return lines.join("\n");
}
function envRange(lines) {
const h = lines.findIndex(l => /^\s*\[env\]\s*(#.*)?$/.test(l));
if (h < 0) return null;
let e = lines.findIndex((l, i) => i > h && HEADER.test(l));
return { h: h, end: e < 0 ? lines.length : e };
}
// [{key, value}] for the active lines of [env], in file order.
function env(text) {
const lines = text.split("\n");
const r = envRange(lines);
if (!r) return [];
const out = [];
for (let i = r.h + 1; i < r.end; i++) {
const m = KEY.exec(lines[i]);
if (m && !m[2]) out.push({ key: m[3], value: String(value(m[4]).v) });
}
return out;
}
// value is a plain string, quoted here; null removes the key.
function setEnv(text, key, val) {
const lines = text.split("\n");
const r = envRange(lines);
if (!r) {
if (val === null) return text;
return text.replace(/\n*$/, "") + "\n\n[env]\n" + key + " = " + quote(val) + "\n";
}
let last = r.h;
for (let i = r.h + 1; i < r.end; i++) {
const m = KEY.exec(lines[i]);
if (!m || m[2]) continue;
if (m[3] === key) {
if (val === null) lines.splice(i, 1);
else lines[i] = m[1] + key + " = " + quote(val) + m[4].slice(value(m[4]).end);
return lines.join("\n");
}
last = i;
}
if (val === null) return text;
lines.splice(last + 1, 0, key + " = " + quote(val));
return lines.join("\n");
}
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