Add print-ready PDF (#127)

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Luca Palmieri 2024-08-06 17:09:04 +02:00 committed by GitHub
parent 0910f3909f
commit c9ed60daf5
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11 changed files with 860 additions and 7 deletions

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@ -16,8 +16,10 @@ jobs:
with: with:
fetch-depth: 0 fetch-depth: 0
- uses: actions-rust-lang/setup-rust-toolchain@v1 - uses: actions-rust-lang/setup-rust-toolchain@v1
- name: Install plugin - name: Install exercise plugin
run: cargo install --path helpers/mdbook-exercise-linker run: cargo install --path helpers/mdbook-exercise-linker
- name: Install link shortener plugin
run: cargo install --path helpers/mdbook-link-shortener
- name: Install mdbook-pandoc and related dependencies - name: Install mdbook-pandoc and related dependencies
run: | run: |
cargo install mdbook-pandoc --locked --version 0.7.1 cargo install mdbook-pandoc --locked --version 0.7.1
@ -63,6 +65,8 @@ jobs:
with: with:
tool: mdbook tool: mdbook
- name: Build book - name: Build book
env:
LINK_SHORTENER_VERIFY: "true"
run: | run: |
cd book cd book
mdbook build mdbook build
@ -82,11 +86,25 @@ jobs:
# When you support multiple formats, the output directory changes # When you support multiple formats, the output directory changes
# to include the format in its path. # to include the format in its path.
path: book/book/html path: book/book/html
# Upload the PDF book as an artifact - uses: actions/upload-artifact@v4
with:
name: online-pdf
path: book/book/pandoc/pdf/100-exercises-to-learn-rust.pdf
- uses: actions/upload-artifact@v4 - uses: actions/upload-artifact@v4
with: with:
name: paperback name: paperback
path: book/book/pandoc/pdf/100-exercises-to-learn-rust.pdf path: book/book/pandoc/paperback/100-exercises-to-learn-rust.pdf
is_fresh:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v3
- run: sudo apt-get update && sudo apt-get install -y jq
- run: |
./helpers/json2redirects.sh book/link2alias.json > site/redirects
# Verify nothing has changed, meaning that the redirect file is up-to-date
- run: |
git diff --exit-code site/redirects
formatter: formatter:
runs-on: ubuntu-latest runs-on: ubuntu-latest

105
Cargo.lock generated
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@ -163,6 +163,15 @@ version = "0.21.7"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567" checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
[[package]]
name = "bimap"
version = "0.6.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "230c5f1ca6a325a32553f8640d31ac9b49f2411e901e427570154868b46da4f7"
dependencies = [
"serde",
]
[[package]] [[package]]
name = "bitflags" name = "bitflags"
version = "1.3.2" version = "1.3.2"
@ -280,6 +289,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0fbb260a053428790f3de475e304ff84cdbc4face759ea7a3e64c1edd938a7fc" checksum = "0fbb260a053428790f3de475e304ff84cdbc4face759ea7a3e64c1edd938a7fc"
dependencies = [ dependencies = [
"clap_builder", "clap_builder",
"clap_derive",
] ]
[[package]] [[package]]
@ -304,6 +314,18 @@ dependencies = [
"clap", "clap",
] ]
[[package]]
name = "clap_derive"
version = "4.5.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "501d359d5f3dcaf6ecdeee48833ae73ec6e42723a1e52419c79abf9507eec0a0"
dependencies = [
"heck",
"proc-macro2",
"quote",
"syn",
]
[[package]] [[package]]
name = "clap_lex" name = "clap_lex"
version = "0.7.2" version = "0.7.2"
@ -448,6 +470,12 @@ dependencies = [
name = "drop" name = "drop"
version = "0.1.0" version = "0.1.0"
[[package]]
name = "either"
version = "1.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
[[package]] [[package]]
name = "elasticlunr-rs" name = "elasticlunr-rs"
version = "3.0.2" version = "3.0.2"
@ -667,6 +695,15 @@ dependencies = [
"version_check", "version_check",
] ]
[[package]]
name = "getopts"
version = "0.2.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
dependencies = [
"unicode-width",
]
[[package]] [[package]]
name = "getrandom" name = "getrandom"
version = "0.2.15" version = "0.2.15"
@ -771,6 +808,12 @@ dependencies = [
name = "heap" name = "heap"
version = "0.1.0" version = "0.1.0"
[[package]]
name = "heck"
version = "0.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
[[package]] [[package]]
name = "hermit-abi" name = "hermit-abi"
version = "0.3.9" version = "0.3.9"
@ -1037,6 +1080,15 @@ dependencies = [
"ticket_fields", "ticket_fields",
] ]
[[package]]
name = "itertools"
version = "0.13.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
dependencies = [
"either",
]
[[package]] [[package]]
name = "itoa" name = "itoa"
version = "1.0.11" version = "1.0.11"
@ -1182,7 +1234,7 @@ dependencies = [
"once_cell", "once_cell",
"opener", "opener",
"pathdiff", "pathdiff",
"pulldown-cmark", "pulldown-cmark 0.10.3",
"regex", "regex",
"serde", "serde",
"serde_json", "serde_json",
@ -1206,6 +1258,21 @@ dependencies = [
"serde_json", "serde_json",
] ]
[[package]]
name = "mdbook-link-shortener"
version = "0.1.0"
dependencies = [
"anyhow",
"bimap",
"clap",
"itertools",
"mdbook",
"pulldown-cmark 0.11.0",
"pulldown-cmark-to-cmark",
"semver",
"serde_json",
]
[[package]] [[package]]
name = "memchr" name = "memchr"
version = "2.7.4" version = "2.7.4"
@ -1615,7 +1682,20 @@ checksum = "76979bea66e7875e7509c4ec5300112b316af87fa7a252ca91c448b32dfe3993"
dependencies = [ dependencies = [
"bitflags 2.6.0", "bitflags 2.6.0",
"memchr", "memchr",
"pulldown-cmark-escape", "pulldown-cmark-escape 0.10.1",
"unicase",
]
[[package]]
name = "pulldown-cmark"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8746739f11d39ce5ad5c2520a9b75285310dbfe78c541ccf832d38615765aec0"
dependencies = [
"bitflags 2.6.0",
"getopts",
"memchr",
"pulldown-cmark-escape 0.11.0",
"unicase", "unicase",
] ]
@ -1625,6 +1705,21 @@ version = "0.10.1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bd348ff538bc9caeda7ee8cad2d1d48236a1f443c1fa3913c6a02fe0043b1dd3" checksum = "bd348ff538bc9caeda7ee8cad2d1d48236a1f443c1fa3913c6a02fe0043b1dd3"
[[package]]
name = "pulldown-cmark-escape"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "007d8adb5ddab6f8e3f491ac63566a7d5002cc7ed73901f72057943fa71ae1ae"
[[package]]
name = "pulldown-cmark-to-cmark"
version = "15.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b9c77db841443d89a57ae94f22d29c022f6d9f41b00bddbf1f4024dbaf4bdce1"
dependencies = [
"pulldown-cmark 0.11.0",
]
[[package]] [[package]]
name = "quote" name = "quote"
version = "1.0.36" version = "1.0.36"
@ -2290,6 +2385,12 @@ dependencies = [
"tinyvec", "tinyvec",
] ]
[[package]]
name = "unicode-width"
version = "0.1.13"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0336d538f7abc86d282a4189614dfaa90810dfc2c6f6427eaf88e16311dd225d"
[[package]] [[package]]
name = "unwrap" name = "unwrap"
version = "0.1.0" version = "0.1.0"

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@ -1,5 +1,11 @@
[workspace] [workspace]
members = ["exercises/*/*", "helpers/common", "helpers/mdbook-exercise-linker", "helpers/ticket_fields"] members = [
"exercises/*/*",
"helpers/common",
"helpers/mdbook-exercise-linker",
"helpers/mdbook-link-shortener",
"helpers/ticket_fields",
]
resolver = "2" resolver = "2"
# This is needed to guarantee the expected behaviour on that specific exercise, # This is needed to guarantee the expected behaviour on that specific exercise,

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@ -39,8 +39,44 @@ header-includes = [
"\\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\\\\{\\},fontsize=\\small}", "\\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\\\\{\\},fontsize=\\small}",
] ]
[output.pandoc.profile.paperback]
output-file = "100-exercises-to-learn-rust.pdf"
to = "latex"
highlight-style = "monochrome"
# We use `lualatext` because, right now, it's the only engine
# that supports fallback fonts, which we need for emojis.
pdf-engine = "lualatex"
[output.pandoc.profile.paperback.variables]
subtitle = "A hands-on course by Mainmatter"
# You can get these fonts here: https://fonts.google.com/selection?query=noto+color+
mainfont = "Noto Serif"
sansfont = "Noto Sans"
monofont = "Noto Sans Mono"
mainfontfallback = ["Noto Color Emoji:mode=harf"]
sansfontfallback = ["Noto Color Emoji:mode=harf"]
monofontfallback = [
"Noto Color Emoji:mode=harf",
]
urlstyle = "rm"
documentclass = "book"
fontsize = "11pt"
geometry = "papersize={8in,10in},top=2cm,bottom=2cm,left=2.4cm,right=2.4cm"
header-includes = [
# Reduce font size of code blocks
"\\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\\\\{\\},fontsize=\\small}",
]
links-as-notes = true
[output.html] [output.html]
git-repository-url = "https://github.com/mainmatter/100-exercises-to-learn-rust" git-repository-url = "https://github.com/mainmatter/100-exercises-to-learn-rust"
[preprocessor.exercise-linker] [preprocessor.exercise-linker]
exercise_root_url = "https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises" exercise_root_url = "https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises"
[preprocessor.link-shortener]
base_url = "https://ruex.io"
renderers = ["pandoc"]
mapping = "link2alias.json"
verify = false
after = ["exercise-linker"]

189
book/link2alias.json Normal file
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@ -0,0 +1,189 @@
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"https://zero2prod.com": "ff8"
}

12
helpers/json2redirects.sh Executable file
View File

@ -0,0 +1,12 @@
#!/bin/bash
# Ensure the JSON file is provided as an argument
if [ "$#" -ne 1 ]; then
echo "Usage: $0 <input_json_file>"
exit 1
fi
input_file=$1
# Use jq to parse the JSON and format the output
jq -r 'to_entries[] | "/" + .value + " " + .key' "$input_file"

View File

@ -3,7 +3,6 @@ use mdbook::book::Book;
use mdbook::preprocess::{Preprocessor, PreprocessorContext}; use mdbook::preprocess::{Preprocessor, PreprocessorContext};
use mdbook::BookItem; use mdbook::BookItem;
/// A no-op preprocessor.
pub struct ExerciseLinker; pub struct ExerciseLinker;
impl ExerciseLinker { impl ExerciseLinker {

View File

@ -0,0 +1,15 @@
[package]
name = "mdbook-link-shortener"
version = "0.1.0"
edition = "2021"
[dependencies]
anyhow = "1.0.86"
bimap = { version = "0.6.3", features = ["serde"] }
clap = { version = "4.5.4", features = ["derive"] }
itertools = "0.13.0"
mdbook = "0.4.40"
pulldown-cmark = "0.11.0"
pulldown-cmark-to-cmark = "15"
semver = "1.0.23"
serde_json = "1.0.117"

View File

@ -0,0 +1,224 @@
use anyhow::{Context, Error};
use bimap::BiHashMap;
use itertools::Itertools;
use mdbook::book::{Book, Chapter};
use mdbook::preprocess::{Preprocessor, PreprocessorContext};
use mdbook::BookItem;
use std::collections::{BTreeMap, BTreeSet};
use std::fs::File;
use std::path::PathBuf;
use std::str::FromStr;
pub struct LinkShortener;
struct AliasGenerator {
cursors: [usize; 3],
}
impl AliasGenerator {
const ALPHABET: &'static [u8] = b"f2z4x6v8bnm3q5w7e9rtyuplkshgjdca";
fn new() -> AliasGenerator {
AliasGenerator { cursors: [0, 0, 0] }
}
/// Generate a 4 alphanumeric long alias, starting from "aaaa" and incrementing by one each time
/// until "9999", using only lowercase letters and numbers.
/// We skip ambiguous characters like "0", "o", "1", "l".
fn next(&mut self) -> String {
let mut alias = String::with_capacity(4);
for cursor in &mut self.cursors {
alias.push(Self::ALPHABET[*cursor] as char);
}
for cursor in self.cursors.iter_mut().rev() {
if *cursor == Self::ALPHABET.len() - 1 {
*cursor = 0;
} else {
*cursor += 1;
break;
}
}
alias
}
/// Generate a unique alias that is not already used by the `link2alias` map.
fn next_until_unique(&mut self, link2alias: &BiHashMap<String, String>) -> String {
let mut alias = self.next();
while link2alias.contains_right(&alias) {
alias = self.next();
}
alias
}
}
impl LinkShortener {
pub fn new() -> LinkShortener {
LinkShortener
}
}
impl Preprocessor for LinkShortener {
fn name(&self) -> &str {
"link-shortener"
}
fn run(&self, ctx: &PreprocessorContext, mut book: Book) -> Result<Book, Error> {
let config = ctx
.config
.get_preprocessor(self.name())
.context("Failed to get preprocessor configuration")?;
let root_url = {
let root_url = config.get("base_url").context("Failed to get `base_url`")?;
root_url
.as_str()
.context("`base_url` is not a string")?
.to_owned()
};
let mapping = {
let mapping = config.get("mapping").context("Failed to get `mapping`")?;
let mapping = mapping
.as_str()
.context("`mapping` is not a string")?
.to_owned();
PathBuf::from_str(&mapping).context("Failed to parse `mapping` as a path")?
};
let mut link2alias = {
match File::open(&mapping) {
Ok(file) => {
serde_json::from_reader(file).context("Failed to parse existing mapping")?
}
Err(e) => {
if e.kind() == std::io::ErrorKind::NotFound {
BiHashMap::new()
} else {
return Err(e).context("Failed to open existing mapping");
}
}
}
};
let verify = config
.get("verify")
.context("Failed to get `verify`")?
.as_bool()
.context("`verify` is not a boolean")?;
// Env var overrides config
let verify = std::env::var("LINK_SHORTENER_VERIFY")
.map(|v| v == "true")
.unwrap_or(verify);
let mut alias_gen = AliasGenerator::new();
book.sections.iter_mut().for_each(|i| {
if let BookItem::Chapter(c) = i {
c.content = replace_anchors(c, &root_url, &mut alias_gen, &mut link2alias, verify)
.expect("Error converting links for chapter");
for i in c.sub_items.iter_mut() {
if let BookItem::Chapter(sub_chapter) = i {
sub_chapter.content = replace_anchors(
sub_chapter,
&root_url,
&mut alias_gen,
&mut link2alias,
verify,
)
.expect("Error converting links for subchapter");
}
}
}
});
if !verify {
std::fs::create_dir_all(mapping.parent().expect("Mapping file path has no parent"))?;
let mut file = File::create(&mapping).context("Failed to upsert mapping file")?;
let ordered = link2alias.iter().collect::<BTreeMap<_, _>>();
serde_json::to_writer_pretty(&mut file, &ordered)?;
}
Ok(book)
}
fn supports_renderer(&self, _renderer: &str) -> bool {
true
}
}
fn replace_anchors(
chapter: &mut Chapter,
root_url: &str,
alias_gen: &mut AliasGenerator,
link2alias: &mut BiHashMap<String, String>,
verify: bool,
) -> Result<String, anyhow::Error> {
use pulldown_cmark::{CowStr, Event, LinkType, Options, Parser, Tag};
use pulldown_cmark_to_cmark::cmark;
let mut buf = String::with_capacity(chapter.content.len());
let mut unshortened_links = BTreeSet::new();
let events = Parser::new_ext(&chapter.content, Options::all())
.map(|e| {
let Event::Start(Tag::Link {
link_type,
dest_url,
title,
id,
}) = &e
else {
return e;
};
match link_type {
LinkType::Autolink
| LinkType::Shortcut
| LinkType::Inline
| LinkType::Reference
| LinkType::Collapsed => {
if dest_url.starts_with("http") {
let alias = if let Some(alias) = link2alias.get_by_left(dest_url.as_ref()) {
alias.to_owned()
} else {
if verify {
unshortened_links.insert(dest_url.to_string());
return e;
}
let alias = alias_gen.next_until_unique(&link2alias);
alias
};
link2alias.insert(dest_url.to_string(), alias.clone());
Event::Start(Tag::Link {
link_type: link_type.to_owned(),
dest_url: CowStr::from(format!(
"{root_url}/{alias}",
root_url = root_url,
alias = alias
)),
title: title.clone(),
id: id.clone(),
})
} else {
e
}
}
LinkType::Email
| LinkType::ReferenceUnknown
| LinkType::CollapsedUnknown
| LinkType::ShortcutUnknown => e,
}
})
.collect_vec();
if verify && !unshortened_links.is_empty() {
let unshortened_links = unshortened_links.iter().join(", ");
return Err(anyhow::anyhow!(
"The following links are not shortened: {unshortened_links}\nRun again with `LINK_SHORTENER_VERIFY=false` to update the mapping \
with the shortened links."
));
}
cmark(events.into_iter(), &mut buf)
.map(|_| buf)
.map_err(|err| anyhow::anyhow!("Markdown serialization failed: {err}"))
}

View File

@ -0,0 +1,66 @@
use clap::Parser;
use mdbook::errors::Error;
use mdbook::preprocess::{CmdPreprocessor, Preprocessor};
use mdbook_link_shortener::LinkShortener;
use semver::{Version, VersionReq};
use std::io;
use std::process;
#[derive(clap::Parser, Debug)]
#[command(version, about)]
pub struct Cli {
#[command(subcommand)]
sub: Option<SubCommand>,
}
#[derive(clap::Parser, Debug)]
pub enum SubCommand {
#[clap(name = "supports")]
Supports(Supports),
}
#[derive(clap::Parser, Debug)]
pub struct Supports {
#[arg(long)]
renderer: String,
}
fn main() -> Result<(), anyhow::Error> {
let cli = Cli::parse();
let preprocessor = LinkShortener::new();
if let Some(SubCommand::Supports(Supports { renderer })) = cli.sub {
let code = if preprocessor.supports_renderer(&renderer) {
0
} else {
1
};
process::exit(code);
}
handle_preprocessing(&preprocessor)?;
Ok(())
}
fn handle_preprocessing(pre: &dyn Preprocessor) -> Result<(), Error> {
let (ctx, book) = CmdPreprocessor::parse_input(io::stdin())?;
let book_version = Version::parse(&ctx.mdbook_version)?;
let version_req = VersionReq::parse(mdbook::MDBOOK_VERSION)?;
if !version_req.matches(&book_version) {
eprintln!(
"Warning: The {} plugin was built against version {} of mdbook, \
but we're being called from version {}",
pre.name(),
mdbook::MDBOOK_VERSION,
ctx.mdbook_version
);
}
let processed_book = pre.run(&ctx, book)?;
serde_json::to_writer(io::stdout(), &processed_book)?;
Ok(())
}

187
site/redirects Normal file
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@ -0,0 +1,187 @@
/f2u https://blog.acolyer.org/2019/05/28/cheri-abi/
/f4q https://crates.io
/f2n https://crates.io/crates/cargo-modules
/ffr https://doc.rust-lang.org/book/ch03-02-data-types.html#integer-types
/f6t https://doc.rust-lang.org/book/title-page.html
/f4m https://doc.rust-lang.org/cargo/reference/cargo-targets.html#cargo-targets
/ffc https://doc.rust-lang.org/cargo/reference/profiles.html
/f45 https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html
/f6u https://doc.rust-lang.org/nomicon/
/f2z https://doc.rust-lang.org/reference/expressions/operator-expr.html#numeric-cast
/fzf https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence
/f4c https://doc.rust-lang.org/reference/lifetime-elision.html
/fxy https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html
/fzm https://doc.rust-lang.org/std/cmp/index.html
/fzz https://doc.rust-lang.org/std/cmp/trait.PartialEq.html
/fzb https://doc.rust-lang.org/std/cmp/trait.PartialOrd.html
/fzp https://doc.rust-lang.org/std/convert/trait.From.html#implementors
/fzl https://doc.rust-lang.org/std/convert/trait.Into.html#implementors
/f4s https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
/fxf https://doc.rust-lang.org/std/iter/trait.Iterator.html
/ffj https://doc.rust-lang.org/std/keyword.for.html
/ffh https://doc.rust-lang.org/std/keyword.while.html
/ffl https://doc.rust-lang.org/std/macro.panic.html
/f27 https://doc.rust-lang.org/std/mem/fn.size_of.html
/fzn https://doc.rust-lang.org/std/ops/index.html
/fz4 https://doc.rust-lang.org/std/ops/trait.Add.html
/fzt https://doc.rust-lang.org/std/ops/trait.Deref.html#deref-coercion
/fzv https://doc.rust-lang.org/std/ops/trait.Div.html
/fz6 https://doc.rust-lang.org/std/ops/trait.Mul.html
/fz8 https://doc.rust-lang.org/std/ops/trait.Rem.html
/fzx https://doc.rust-lang.org/std/ops/trait.Sub.html
/f2c https://doc.rust-lang.org/std/prelude/index.html
/ffe https://doc.rust-lang.org/std/primitive.i32.html#associatedconstant.MAX
/ff7 https://doc.rust-lang.org/std/primitive.i32.html#associatedconstant.MIN
/ffw https://doc.rust-lang.org/std/primitive.u32.html#associatedconstant.MAX
/f4d https://doc.rust-lang.org/std/slice/struct.Iter.html
/f26 https://doc.rust-lang.org/std/string/struct.String.html
/fxh https://doc.rust-lang.org/std/sync/atomic/index.html
/f4j https://doc.rust-lang.org/std/vec/struct.Vec.html#method.iter
/f2y https://docs.rs/dhat/latest/dhat/
/fx2 https://docs.rs/itertools/
/f4n https://docs.rs/thiserror/latest/thiserror/
/f65 https://docs.rs/tokio-stream/latest/tokio_stream/
/f6m https://docs.rs/tokio-stream/latest/tokio_stream/trait.StreamExt.html#method.merge
/f63 https://docs.rs/tokio-util/latest/tokio_util/sync/struct.CancellationToken.html
/f6z https://docs.rs/tokio/latest/tokio/task/struct.JoinError.html
/f6k https://docs.rust-embedded.org/book/
/f2h https://en.wikipedia.org/wiki/Dangling_pointer
/fx7 https://en.wikipedia.org/wiki/Data_segment
/f2r https://en.wikipedia.org/wiki/Memory_address
/f2e https://en.wikipedia.org/wiki/Stack_overflow
/ff9 https://en.wikipedia.org/wiki/Two%27s_complement
/f2v https://en.wikipedia.org/wiki/UTF-8
/f6r https://exercism.io
/ffb https://github.com/LukeMathWalker/cargo-chef
/ffm https://github.com/LukeMathWalker/wiremock-rs
/fzq https://github.com/dtolnay/cargo-expand
/fzw https://github.com/dtolnay/proc-macro-workshop
/ff6 https://github.com/mainmatter/100-exercises-to-learn-rust
/ff3 https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises/01_intro/00_welcome
/ffq https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises/01_intro/01_syntax
/ff5 https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises/02_basic_calculator/00_intro
/fft https://github.com/mainmatter/100-exercises-to-learn-rust/tree/main/exercises/02_basic_calculator/01_integers
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