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// This file is part of Germ <https://github.com/gemrest/germ>.
// Copyright (C) 2022-2022 Fuwn <[email protected]>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// 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.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <[email protected]>
// SPDX-License-Identifier: GPL-3.0-only
use {crate::ast::Node, std::fmt::Write};
pub fn convert(source: &[Node]) -> String {
let mut markdown = String::new();
// Since we have an AST tree of the Gemtext, it is very easy to convert from
// this AST tree to an alternative markup format.
for node in source {
match node {
Node::Text(text) => {
let _ = writeln!(&mut markdown, "{text}");
}
Node::Link { to, text } => markdown.push_str(&text.clone().map_or_else(
|| format!("<{to}>\n"),
|text| format!("[{text}]({to})\n"),
)),
Node::Heading { level, text } => {
let _ = writeln!(
&mut markdown,
"{} {}",
match level {
1 => "#",
2 => "##",
3 => "###",
_ => "",
},
text
);
}
Node::List(items) => {
let _ = writeln!(
&mut markdown,
"{}",
items
.iter()
.map(|i| format!("- {i}"))
.collect::<Vec<String>>()
.join("\n"),
);
}
Node::Blockquote(text) => {
let _ = writeln!(&mut markdown, "> {text}");
}
Node::PreformattedText { alt_text, text } => {
let _ = writeln!(
&mut markdown,
"```{}\n{}```",
alt_text.clone().unwrap_or_default(),
text
);
}
Node::Whitespace => markdown.push('\n'),
}
}
markdown
}
|