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feat(debug): Adding CLI for testing liquid
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Note: this relies on a nightly Cargo.toml feature `required-features`.
Under stable, you will see a warning about an unsupported option and then
the build will fail due to a missing `clap` unless you specify
`--features=cli`.
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epage committed Apr 28, 2017
1 parent 73d4800 commit 5f0b04d
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Showing 4 changed files with 145 additions and 13 deletions.
6 changes: 3 additions & 3 deletions .travis.yml
Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,9 @@ install:
- export PATH=$HOME/.cargo/bin:$PATH

script:
- cargo build
- cargo test
- if [ "$TRAVIS_RUST_VERSION" = "nightly" ]; then (cargo clippy) fi
- cargo build --features=cli
- cargo test --features=cli
- if [ "$TRAVIS_RUST_VERSION" = "nightly" ]; then (cargo clippy --features=cli) fi
- cargo fmt -- --write-mode=diff

addons:
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26 changes: 18 additions & 8 deletions Cargo.toml
Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
[package]

name = "liquid"
version = "0.9.1"
authors = ["Johann Hofmann <[email protected]>"]
Expand All @@ -13,22 +12,33 @@ license = "MIT"

build = "build.rs"

[[bin]]
name = "liquid-dbg"
required-features = ["cli"]
test = false
doctest = false
bench = false
doc = false

[features]
default = ["extra-filters"]
cli = ["clap", "error-chain", "toml"]
extra-filters = []
dev = []

[dependencies]
regex = "0.2"
lazy_static = "0.2"
chrono = "0.3"
unicode-segmentation = "1.1"

clap = { version = "2.22.0", optional = true }
error-chain = { version = "0.10.0", optional = true }
toml = { version = "0.3.2", optional = true }

[build-dependencies]
skeptic = "0.9"

[dev-dependencies]
difference = "1.0"
skeptic = "0.9"

[features]
default = ["extra-filters"]

extra-filters = []

dev=[]
4 changes: 2 additions & 2 deletions appveyor.yml
Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,8 @@ install:
- cargo -V

test_script:
- cargo build --verbose
- cargo test
- cargo build --verbose --features=cli
- cargo test --features=cli

cache:
- C:\Users\appveyor\.cargo\registry
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122 changes: 122 additions & 0 deletions src/main.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,122 @@
#[macro_use]
extern crate clap;
#[macro_use]
extern crate error_chain;
extern crate liquid;
extern crate toml;

use std::collections;
use std::fs;
use std::io;
use std::io::{Write, Read};
use std::path;
use liquid::Renderable;

macro_rules! println_stderr(
($($arg:tt)*) => { {
let r = writeln!(&mut ::std::io::stderr(), $($arg)*);
r.expect("failed printing to stderr");
} }
);

error_chain! {

links {
}

foreign_links {
Clap(clap::Error);
Io(io::Error);
Liquid(liquid::Error);
Toml(toml::de::Error);
}

errors {
}
}

fn option<'a>(name: &'a str, value: &'a str) -> clap::Arg<'a, 'a> {
clap::Arg::with_name(name).long(name).value_name(value)
}

fn convert_value(toml_value: &toml::Value) -> Result<liquid::Value> {
match *toml_value {
toml::Value::String(ref s) => Ok(liquid::Value::Str(s.to_string())),
toml::Value::Integer(n) => Ok(liquid::Value::Num(n as f32)),
toml::Value::Float(n) => Ok(liquid::Value::Num(n as f32)),
toml::Value::Boolean(b) => Ok(liquid::Value::Bool(b)),
toml::Value::Datetime(_) => Err("Datetime's are unsupported".into()),
toml::Value::Array(ref a) => {
let liquid_array: Result<Vec<liquid::Value>> = a.iter().map(convert_value).collect();
let liquid_array = liquid_array?;
Ok(liquid::Value::Array(liquid_array))
}
toml::Value::Table(ref t) => {
let liquid_object: Result<collections::HashMap<String, liquid::Value>> = t.iter()
.map(|(k, v)| {
let v = convert_value(v);
match v {
Ok(v) => Ok((k.to_string(), v)),
Err(e) => Err(e),
}
})
.collect();
let liquid_object = liquid_object?;
Ok(liquid::Value::Object(liquid_object))
}
}
}

fn build_context(path: &path::Path) -> Result<liquid::Context> {
let mut input = String::new();
let mut f = fs::File::open(path)?;
f.read_to_string(&mut input)?;
let input: toml::Value = input.parse()?;
let value = convert_value(&input)?;
let value = match value {
liquid::Value::Object(o) => Ok(o),
_ => Err("File must be a toml table"),
}?;
let data = liquid::Context::with_values(value);

Ok(data)
}

fn run() -> Result<()> {
let matches = clap::App::new("liquidate").version(crate_version!())
.author(crate_authors!())
.arg(option("input", "LIQUID").required(true))
.arg(option("output", "TXT"))
.arg(option("context", "TOML"))
.arg(option("include-root", "PATH"))
.get_matches_safe()?;

let mut options = liquid::LiquidOptions::default();
options.file_system = matches.value_of("include-root").map(path::PathBuf::from);

let mut data = matches.value_of("context")
.map(|s| {
let p = path::PathBuf::from(s);
build_context(p.as_path())
})
.map_or(Ok(None), |r| r.map(Some))?
.unwrap_or_else(liquid::Context::new);

let template_path =
matches.value_of("input").map(path::PathBuf::from).expect("Parameter was required");
let template = liquid::parse_file(template_path, options)?;
let output = template.render(&mut data)?.unwrap_or_else(|| "".to_string());
match matches.value_of("output") {
Some(path) => {
let mut out = fs::File::create(path::PathBuf::from(path))?;
out.write_all(output.as_bytes())?;
}
None => {
println!("{}", output);
}
}

Ok(())
}

quick_main!(run);

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