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Allow specifying preprocessor order 

Fixes #1172
This commit is contained in:
ISSOtm 2021-07-21 17:38:59 +02:00
parent a306da3ad7
commit 9c34e602bd
4 changed files with 191 additions and 24 deletions
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7
Cargo.lock generated
View File

@ -869,6 +869,7 @@ dependencies = [
"tempfile",
"tokio",
"toml",
"topological-sort",
"walkdir",
"warp",
]
@ -1781,6 +1782,12 @@ dependencies = [
"serde",
]
[[package]]
name = "topological-sort"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa7c7f42dea4b1b99439786f5633aeb9c14c1b53f75e282803c2ec2ad545873c"
[[package]]
name = "tower-service"
version = "0.3.1"

1
Cargo.toml
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@ -33,6 +33,7 @@ serde_json = "1.0"
shlex = "1"
tempfile = "3.0"
toml = "0.5.1"
topological-sort = "0.1.0"
# Watch feature
notify = { version = "4.0", optional = true }

22
guide/src/format/configuration/preprocessors.md
View File

@ -56,3 +56,25 @@ be overridden by adding a `command` field.
[preprocessor.random]
command = "python random.py"
```
### Require A Certain Order
The order in which preprocessors are run is not guaranteed, but you can request some to run before or after others.
For example, suppose you want your `linenos` preprocessor to process lines that may have been `{{#include}}`d; then you want it to run after the built-in `links` preprocessor, which you can require using the `before` and/or `after` fields.
```toml
[preprocessor.linenos]
after = [ "links" ]
```
or
```toml
[preprocessor.links]
before = [ "linenos" ]
```
It would be possible, though redundant, to specify both of the above in the same config file.
`mdbook` will detect any infinite loops and error out.
Note that order of preprocessors besides what is specified using `before` and `after` is not guaranteed, and may change within the same run of `mdbook`.

183
src/book/mod.rs
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@ -20,6 +20,7 @@ use std::process::Command;
use std::string::ToString;
use tempfile::Builder as TempFileBuilder;
use toml::Value;
use topological_sort::TopologicalSort;
use crate::errors::*;
use crate::preprocess::{
@ -372,12 +373,7 @@ fn determine_renderers(config: &Config) -> Vec<Box<dyn Renderer>> {
renderers
}
fn default_preprocessors() -> Vec<Box<dyn Preprocessor>> {
vec![
Box::new(LinkPreprocessor::new()),
Box::new(IndexPreprocessor::new()),
]
}
const DEFAULT_PREPROCESSORS: &[&'static str] = &["links", "index"];
fn is_default_preprocessor(pre: &dyn Preprocessor) -> bool {
let name = pre.name();
@ -386,36 +382,87 @@ fn is_default_preprocessor(pre: &dyn Preprocessor) -> bool {
/// Look at the `MDBook` and try to figure out what preprocessors to run.
fn determine_preprocessors(config: &Config) -> Result<Vec<Box<dyn Preprocessor>>> {
let mut preprocessors = Vec::new();
// Collect the names of all preprocessors intended to be run, and the order
// in which they should be run.
let mut preprocessor_names = TopologicalSort::<String>::new();
if config.build.use_default_preprocessors {
preprocessors.extend(default_preprocessors());
for name in DEFAULT_PREPROCESSORS {
preprocessor_names.insert(name.to_string());
}
}
if let Some(preprocessor_table) = config.get("preprocessor").and_then(Value::as_table) {
for key in preprocessor_table.keys() {
match key.as_ref() {
"links" => preprocessors.push(Box::new(LinkPreprocessor::new())),
"index" => preprocessors.push(Box::new(IndexPreprocessor::new())),
name => preprocessors.push(interpret_custom_preprocessor(
name,
&preprocessor_table[name],
)),
for (name, table) in preprocessor_table.iter() {
preprocessor_names.insert(name.to_string());
let exists = |name| {
(config.build.use_default_preprocessors && DEFAULT_PREPROCESSORS.contains(&name))
|| preprocessor_table.contains_key(name)
};
if let Some(before) = table.get("before").and_then(Value::as_array) {
for after in before {
let after = after.as_str().ok_or_else(|| {
Error::msg(format!(
"Expected preprocessor.{}.before to contain strings",
name
))
})?;
if exists(after) {
preprocessor_names.add_dependency(name, after);
}
}
}
if let Some(after) = table.get("after").and_then(Value::as_array) {
for before in after {
let before = before.as_str().ok_or_else(|| {
Error::msg(format!(
"Expected preprocessor.{}.after to contain strings",
name
))
})?;
if exists(before) {
preprocessor_names.add_dependency(before, name);
}
}
}
}
}
// Now that all links have been established, queue preprocessors in a suitable order
let mut preprocessors = Vec::with_capacity(preprocessor_names.len());
while let Some(name) = preprocessor_names.pop() {
let preprocessor: Box<dyn Preprocessor> = match name.as_str() {
"links" => Box::new(LinkPreprocessor::new()),
"index" => Box::new(IndexPreprocessor::new()),
_ => {
// The only way to request a custom preprocessor is through the `preprocessor`
// table, so it must exist, be a table, and contain the key.
let table = &config.get("preprocessor").unwrap().as_table().unwrap()[&name];
let command = get_custom_preprocessor_cmd(&name, table);
Box::new(CmdPreprocessor::new(name, command))
}
};
preprocessors.push(preprocessor);
}
if preprocessor_names.is_empty() {
Ok(preprocessors)
} else {
Err(Error::msg("Cyclic dependency detected in preprocessors"))
}
}
fn interpret_custom_preprocessor(key: &str, table: &Value) -> Box<CmdPreprocessor> {
let command = table
fn get_custom_preprocessor_cmd(key: &str, table: &Value) -> String {
table
.get("command")
.and_then(Value::as_str)
.map(ToString::to_string)
.unwrap_or_else(|| format!("mdbook-{}", key));
Box::new(CmdPreprocessor::new(key.to_string(), command))
.unwrap_or_else(|| format!("mdbook-{}", key))
}
fn interpret_custom_renderer(key: &str, table: &Value) -> Box<CmdRenderer> {
@ -563,9 +610,99 @@ mod tests {
// make sure the `preprocessor.random` table exists
let random = cfg.get_preprocessor("random").unwrap();
let random = interpret_custom_preprocessor("random", &Value::Table(random.clone()));
let random = get_custom_preprocessor_cmd("random", &Value::Table(random.clone()));
assert_eq!(random.cmd(), "python random.py");
assert_eq!(random, "python random.py");
}
#[test]
fn preprocessor_order_is_honored() {
let cfg_str = r#"
[preprocessor.random]
before = [ "last" ]
after = [ "index" ]
[preprocessor.last]
after = [ "links", "index" ]
"#;
let cfg = Config::from_str(cfg_str).unwrap();
let preprocessors = determine_preprocessors(&cfg).unwrap();
let index = |name| {
preprocessors
.iter()
.enumerate()
.find(|(_, preprocessor)| preprocessor.name() == name)
.unwrap()
.0
};
let assert_before = |before, after| {
if index(before) >= index(after) {
eprintln!("Preprocessor order:");
for preprocessor in &preprocessors {
eprintln!(" {}", preprocessor.name());
}
panic!("{} should come before {}", before, after);
}
};
assert_before("index", "random");
assert_before("index", "last");
assert_before("random", "last");
assert_before("links", "last");
}
#[test]
fn cyclic_dependencies_are_detected() {
let cfg_str = r#"
[preprocessor.links]
before = [ "index" ]
[preprocessor.index]
before = [ "links" ]
"#;
let cfg = Config::from_str(cfg_str).unwrap();
assert!(determine_preprocessors(&cfg).is_err());
}
#[test]
fn dependencies_dont_register_undefined_preprocessors() {
let cfg_str = r#"
[preprocessor.links]
before = [ "random" ]
"#;
let cfg = Config::from_str(cfg_str).unwrap();
let preprocessors = determine_preprocessors(&cfg).unwrap();
assert!(preprocessors
.iter()
.find(|preprocessor| preprocessor.name() == "random")
.is_none());
}
#[test]
fn dependencies_dont_register_builtin_preprocessors_if_disabled() {
let cfg_str = r#"
[preprocessor.random]
before = [ "links" ]
[build]
use-default-preprocessors = false
"#;
let cfg = Config::from_str(cfg_str).unwrap();
let preprocessors = determine_preprocessors(&cfg).unwrap();
assert!(preprocessors
.iter()
.find(|preprocessor| preprocessor.name() == "links")
.is_none());
}
#[test]