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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
// Splits a message into prose and fenced code, so each code block can carry
// its own copy button: Qt's markdown renders fences but gives no per-block
// hook. A fence opens with ``` or ~~~ (three or more) after any indent, as
// inside a list item, and closes with a run of the same character at least
// as long. The fence's indent is stripped from its lines. A fence still open
// at the end, which is normal while a reply streams, is a code segment with
// open set.
function split(text) {
const out = [];
const prose = [];
let code = null;
const flush = () => {
const t = prose.join("\n").trim();
if (t) out.push({ kind: "prose", text: t });
prose.length = 0;
};
for (const line of text.split("\n")) {
if (code) {
const close = /^\s*(`{3,}|~{3,})\s*$/.exec(line);
if (close && close[1][0] === code.fence[0] && close[1].length >= code.fence.length) {
out.push({ kind: "code", lang: code.lang, text: code.lines.join("\n"), open: false });
code = null;
} else {
code.lines.push(line.startsWith(code.indent) ? line.slice(code.indent.length)
: line.trimStart());
}
continue;
}
// A backtick fence's info string has no backtick (CommonMark), so
// a line opening with inline ```code``` stays prose.
const open = /^(\s*)(`{3,}|~{3,})(.*)$/.exec(line);
if (open && !(open[2][0] === "`" && open[3].includes("`"))) {
flush();
code = { indent: open[1], fence: open[2], lang: open[3].trim().split(/\s+/)[0], lines: [] };
} else {
prose.push(line);
}
}
if (code) out.push({ kind: "code", lang: code.lang, text: code.lines.join("\n"), open: true });
else flush();
return out;
}
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