Added in legacy config format support

This commit is contained in:
Michael Bryan 2017-11-12 21:00:18 +08:00
parent c777913136
commit 238dfb7d1d
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GPG Key ID: E9C602B0D9A998DC
1 changed files with 125 additions and 23 deletions

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@ -7,7 +7,6 @@ use serde::{Deserialize, Deserializer};
use errors::*;
/// The overall configuration object for MDBook.
#[derive(Debug, Clone, Default, PartialEq)]
pub struct Config {
@ -71,6 +70,43 @@ impl Config {
bail!("Key not found, {:?}", name)
}
}
fn from_legacy(mut table: Table) -> Config {
let mut cfg = Config::default();
// we use a macro here instead of a normal loop because the $out
// variable can be different types. This way we can make type inference
// figure out what try_into() deserializes to.
macro_rules! get_and_insert {
($table:expr, $key:expr => $out:expr) => {
if let Some(value) = $table.remove($key).and_then(|v| v.try_into().ok()) {
$out = value;
}
};
}
get_and_insert!(table, "title" => cfg.book.title);
get_and_insert!(table, "authors" => cfg.book.authors);
get_and_insert!(table, "source" => cfg.book.src);
get_and_insert!(table, "description" => cfg.book.description);
// This complicated chain of and_then's is so we can move
// "output.html.destination" to "book.build_dir" and parse it into a
// PathBuf.
let destination: Option<PathBuf> = table.get_mut("output")
.and_then(|output| output.as_table_mut())
.and_then(|output| output.get_mut("html"))
.and_then(|html| html.as_table_mut())
.and_then(|html| html.remove("destination"))
.and_then(|dest| dest.try_into().ok());
if let Some(dest) = destination {
cfg.book.build_dir = dest;
}
cfg.rest = table;
cfg
}
}
fn recursive_get<'a>(key: &[&str], table: &'a Table) -> Option<&'a Value> {
@ -111,7 +147,25 @@ fn recursive_get_mut<'a>(key: &[&str], table: &'a mut Table) -> Option<&'a mut V
impl<'de> Deserialize<'de> for Config {
fn deserialize<D: Deserializer<'de>>(de: D) -> ::std::result::Result<Self, D::Error> {
let raw = Value::deserialize(de)?;
if let Value::Table(mut table) = raw {
let mut table = match raw {
Value::Table(t) => t,
_ => {
use serde::de::Error;
return Err(D::Error::custom(
"A config file should always be a toml table",
));
}
};
if is_legacy_format(&table) {
warn!("It looks like you are using the legacy book.toml format.");
warn!("We'll parse it for now, but you should probably convert to the new format.");
warn!("See the mdbook documentation for more details");
warn!("http://azerupi.github.io/mdBook/format/config.html");
return Ok(Config::from_legacy(table));
}
let book: BookConfig = table.remove("book")
.and_then(|value| value.try_into().ok())
.unwrap_or_default();
@ -119,13 +173,15 @@ impl<'de> Deserialize<'de> for Config {
book: book,
rest: table,
})
} else {
use serde::de::Error;
Err(D::Error::custom("A config file should always be a toml table"))
}
}
}
fn is_legacy_format(table: &Table) -> bool {
let top_level_items = ["title", "author", "authors"];
top_level_items.iter().any(|key| table.contains_key(&key.to_string()))
}
/// Configuration options which are specific to the book and required for
/// loading it from disk.
@ -268,8 +324,8 @@ mod tests {
assert_eq!(baz, baz_should_be);
}
#[test]
fn mutate_some_stuff() {
#[test]
fn mutate_some_stuff() {
// really this is just a sanity check to make sure the borrow checker
// is happy...
let src = COMPLEX_CONFIG;
@ -279,5 +335,51 @@ fn mutate_some_stuff() {
assert_eq!(config.get(key).unwrap(), &Value::Boolean(true));
*config.get_mut(key).unwrap() = Value::Boolean(false);
assert_eq!(config.get(key).unwrap(), &Value::Boolean(false));
}
}
/// The config file format has slightly changed (metadata stuff is now under
/// the `book` table instead of being at the top level) so we're adding a
/// **temporary** compatibility check. You should be able to still load the
/// old format, emitting a warning.
#[test]
fn can_still_load_the_previous_format() {
let src = r#"
title = "mdBook Documentation"
description = "Create book from markdown files. Like Gitbook but implemented in Rust"
authors = ["Mathieu David"]
source = "./source"
[output.html]
destination = "my-book" # the output files will be generated in `root/my-book` instead of `root/book`
theme = "my-theme"
curly-quotes = true
google-analytics = "123456"
additional-css = ["custom.css", "custom2.css"]
additional-js = ["custom.js"]
"#;
let book_should_be = BookConfig {
title: Some(String::from("mdBook Documentation")),
description: Some(String::from(
"Create book from markdown files. Like Gitbook but implemented in Rust",
)),
authors: vec![String::from("Mathieu David")],
build_dir: PathBuf::from("my-book"),
src: PathBuf::from("./source"),
..Default::default()
};
let html_should_be = HtmlConfig {
theme: Some(PathBuf::from("my-theme")),
curly_quotes: true,
google_analytics: Some(String::from("123456")),
additional_css: vec![PathBuf::from("custom.css"), PathBuf::from("custom2.css")],
additional_js: vec![PathBuf::from("custom.js")],
..Default::default()
};
let got = Config::from_str(src).unwrap();
assert_eq!(got.book, book_should_be);
assert_eq!(got.html_config().unwrap(), html_should_be);
}
}