From e7ad51e682d436cf6c11f69b4b5ca825a4f7e8c1 Mon Sep 17 00:00:00 2001
From: Jesse de Wit <witdejesse@hotmail.com>
Date: Fri, 3 Nov 2023 22:51:11 +0100
Subject: [PATCH] trim leading whitespace from code snippets

---
 README.md                      |    1 +
 book.toml                      |    3 +
 snippets-processor/.gitignore  |    1 +
 snippets-processor/Cargo.lock  | 1993 ++++++++++++++++++++++++++++++++
 snippets-processor/Cargo.toml  |   11 +
 snippets-processor/src/main.rs |  123 ++
 6 files changed, 2132 insertions(+)
 create mode 100644 snippets-processor/.gitignore
 create mode 100644 snippets-processor/Cargo.lock
 create mode 100644 snippets-processor/Cargo.toml
 create mode 100644 snippets-processor/src/main.rs

diff --git a/README.md b/README.md
index e6b03d4..4cf4d71 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ To locally serve the docs run:
 
 ```bash
 cargo install mdbook
+cargo install --path ./snippets-processor
 mdbook build
 mdbook serve --open
 ```
diff --git a/book.toml b/book.toml
index 8228943..2edd2f4 100644
--- a/book.toml
+++ b/book.toml
@@ -13,3 +13,6 @@ edit-url-template = "https://github.com/breez/breez-sdk-docs/edit/main/{path}"
 
 [output.html.print]
 enable = false
+
+[preprocessor.snippets]
+after = ["links"]
\ No newline at end of file
diff --git a/snippets-processor/.gitignore b/snippets-processor/.gitignore
new file mode 100644
index 0000000..1de5659
--- /dev/null
+++ b/snippets-processor/.gitignore
@@ -0,0 +1 @@
+target
\ No newline at end of file
diff --git a/snippets-processor/Cargo.lock b/snippets-processor/Cargo.lock
new file mode 100644
index 0000000..86d958e
--- /dev/null
+++ b/snippets-processor/Cargo.lock
@@ -0,0 +1,1993 @@
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diff --git a/snippets-processor/Cargo.toml b/snippets-processor/Cargo.toml
new file mode 100644
index 0000000..f494c85
--- /dev/null
+++ b/snippets-processor/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "mdbook-snippets"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "4.4.7"
+mdbook = "0.4.35"
+serde_json = "1.0.108"
diff --git a/snippets-processor/src/main.rs b/snippets-processor/src/main.rs
new file mode 100644
index 0000000..f5b4edc
--- /dev/null
+++ b/snippets-processor/src/main.rs
@@ -0,0 +1,123 @@
+use clap::{crate_version, Arg, ArgMatches, Command};
+use mdbook::book::Book;
+use mdbook::errors::{Error, Result};
+use mdbook::preprocess::{CmdPreprocessor, Preprocessor, PreprocessorContext};
+use mdbook::BookItem;
+use std::io;
+
+fn main() -> Result<()> {
+    // set up app
+    let matches = make_app().get_matches();
+    let pre = SnippetsProcessor;
+
+    // determine what behaviour has been requested
+    if let Some(sub_args) = matches.subcommand_matches("supports") {
+        // handle cmdline supports
+        handle_supports(&pre, sub_args)
+    } else {
+        // handle preprocessing
+        handle_preprocessing(&pre)
+    }
+}
+
+/// Parse CLI options.
+pub fn make_app() -> Command {
+    Command::new("mdbook-snippets")
+        .version(crate_version!())
+        .about("A preprocessor that removes leading whitespace from code snippets.")
+        .subcommand(
+            Command::new("supports")
+                .arg(Arg::new("renderer").required(true))
+                .about("Check whether a renderer is supported by this preprocessor"),
+        )
+}
+
+/// Tell mdBook if we support what it asks for.
+fn handle_supports(pre: &dyn Preprocessor, sub_args: &ArgMatches) -> Result<()> {
+    let renderer = sub_args
+        .get_one::<String>("renderer")
+        .expect("Required argument");
+    let supported = pre.supports_renderer(renderer);
+    if supported {
+        Ok(())
+    } else {
+        Err(Error::msg(format!(
+            "The snippets preprocessor does not support the '{renderer}' renderer",
+        )))
+    }
+}
+
+/// Preprocess `book` using `pre` and print it out.
+fn handle_preprocessing(pre: &dyn Preprocessor) -> Result<()> {
+    let (ctx, book) = CmdPreprocessor::parse_input(io::stdin())?;
+    check_mdbook_version(&ctx.mdbook_version);
+
+    let processed_book = pre.run(&ctx, book)?;
+    serde_json::to_writer(io::stdout(), &processed_book)?;
+    Ok(())
+}
+
+/// Produce a warning on mdBook version mismatch.
+fn check_mdbook_version(version: &str) {
+    if version != mdbook::MDBOOK_VERSION {
+        eprintln!(
+            "This mdbook-snippets was built against mdbook v{}, \
+            but we are being called from mdbook v{version}. \
+            If you have any issue, this might be a reason.",
+            mdbook::MDBOOK_VERSION,
+        )
+    }
+}
+
+struct SnippetsProcessor;
+impl Preprocessor for SnippetsProcessor {
+    fn name(&self) -> &str {
+        "snippets"
+    }
+
+    fn run(&self, _ctx: &PreprocessorContext, mut book: Book) -> Result<Book> {
+        book.for_each_mut(|item| {
+            if let BookItem::Chapter(chapter) = item {
+                let mut resulting_lines: Vec<&str> = vec![];
+                let mut in_block = false;
+                let mut block_lines: Vec<&str> = vec![];
+                let mut min_indentation: usize = 0;
+                for line in chapter.content.lines() {
+                    if line.starts_with("```") {
+                        if in_block {
+                            // This is end of block
+                            // Replace previous lines
+                            for block_line in block_lines.iter() {
+                                let indent = std::cmp::min(min_indentation, block_line.len());
+                                resulting_lines.push(&block_line[indent..])
+                            }
+                            in_block = false;
+                        } else {
+                            // Start of block
+                            in_block = true;
+                            block_lines = vec![];
+                            min_indentation = usize::MAX;
+                        }
+
+                        resulting_lines.push(line);
+                        continue;
+                    }
+
+                    if in_block {
+                        block_lines.push(line);
+                        let trimmed = line.trim_start_matches(' ');
+                        if !trimmed.is_empty() {
+                            min_indentation =
+                                std::cmp::min(min_indentation, line.len() - trimmed.len())
+                        }
+                    } else {
+                        resulting_lines.push(line);
+                    }
+                }
+
+                chapter.content = resulting_lines.join("\n");
+            }
+        });
+        Ok(book)
+    }
+}