1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// 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;
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) => markdown.push_str(&format!("{text}\n")),
Node::Link {
to,
text,
} =>
markdown.push_str(&text.clone().map_or_else(
|| format!("<{to}>\n"),
|text| format!("[{text}]({to})\n"),
)),
Node::Heading {
level,
text,
} => {
markdown.push_str(&format!(
"{} {}\n",
match level {
1 => "#",
2 => "##",
3 => "###",
_ => "",
},
text
));
}
Node::List(items) =>
markdown.push_str(&format!(
"{}\n",
items
.iter()
.map(|i| format!("- {i}"))
.collect::<Vec<String>>()
.join("\n"),
)),
Node::Blockquote(text) => markdown.push_str(&format!("> {text}\n")),
Node::PreformattedText {
alt_text,
text,
} => {
markdown.push_str(&format!(
"```{}\n{}```\n",
alt_text.clone().unwrap_or_default(),
text
));
}
Node::Whitespace => markdown.push('\n'),
}
}
markdown
}
|