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use failure::Error;
use handlebars::handlebars_helper;
use handlebars::*;
use inflector::Inflector;
use reqwest;
use std::path::Path;
pub fn new_hbs() -> Result<Handlebars, Error> {
let mut handlebars = Handlebars::new();
setup_handlebars(&mut handlebars)?;
Ok(handlebars)
}
pub fn setup_handlebars(handlebars: &mut Handlebars) -> Result<(), Error> {
handlebars.set_strict_mode(true);
register_string_helpers(handlebars)?;
register_http_helpers(handlebars)?;
register_path_helpers(handlebars)?;
Ok(())
}
#[macro_export]
macro_rules! handlebars_register_inflector {
($engine:ident, $fct_name:ident) => {
handlebars_helper!($fct_name: |v: str| v.$fct_name());
$engine.register_helper(stringify!($fct_name), Box::new($fct_name));
}
}
fn register_string_helpers(handlebars: &mut Handlebars) -> Result<(), Error> {
handlebars_helper!(to_lower_case: |v: str| v.to_lowercase());
handlebars.register_helper("to_lower_case", Box::new(to_lower_case));
handlebars_helper!(to_upper_case: |v: str| v.to_uppercase());
handlebars.register_helper("to_upper_case", Box::new(to_upper_case));
handlebars_register_inflector!(handlebars, to_camel_case);
handlebars_register_inflector!(handlebars, to_pascal_case);
handlebars_register_inflector!(handlebars, to_snake_case);
handlebars_register_inflector!(handlebars, to_screaming_snake_case);
handlebars_register_inflector!(handlebars, to_kebab_case);
handlebars_register_inflector!(handlebars, to_train_case);
handlebars_register_inflector!(handlebars, to_sentence_case);
handlebars_register_inflector!(handlebars, to_title_case);
handlebars_register_inflector!(handlebars, to_class_case);
handlebars_register_inflector!(handlebars, to_table_case);
handlebars_register_inflector!(handlebars, to_plural);
handlebars_register_inflector!(handlebars, to_singular);
Ok(())
}
fn http_get_fct<T: AsRef<str>>(url: T) -> String {
match reqwest::get(url.as_ref()).and_then(|mut r| r.text()) {
Ok(s) => s,
Err(e) => {
eprintln!(
"helper: http_get failed for url '{:?}' with error '{:?}'",
url.as_ref(),
e
);
"".to_owned()
}
}
}
fn register_http_helpers(handlebars: &mut Handlebars) -> Result<(), Error> {
handlebars_helper!(http_get: |v: str| http_get_fct(&v));
handlebars.register_helper("http_get", Box::new(http_get));
handlebars_helper!(gitignore_io: |v: str| http_get_fct(format!("https://www.gitignore.io/api/{}", v)));
handlebars.register_helper("gitignore_io", Box::new(gitignore_io));
Ok(())
}
fn register_path_helpers(handlebars: &mut Handlebars) -> Result<(), Error> {
handlebars_helper!(parent: |v: str| Path::new(v).parent().and_then(|s| s.to_str()).unwrap_or("".into()));
handlebars.register_helper("parent", Box::new(parent));
handlebars_helper!(file_name: |v: str| Path::new(v).file_name().and_then(|s| s.to_str()).unwrap_or("".into()));
handlebars.register_helper("file_name", Box::new(file_name));
handlebars_helper!(extension: |v: str| Path::new(v).extension().and_then(|s| s.to_str()).unwrap_or("".into()));
handlebars.register_helper("extension", Box::new(extension));
handlebars_helper!(canonicalize: |v: str| {
Path::new(v).canonicalize().ok().and_then(|s| s.to_str().map(|v| v.to_owned())).unwrap_or("".into())
});
handlebars.register_helper("canonicalize", Box::new(canonicalize));
Ok(())
}
#[cfg(test)]
mod tests {
use super::super::Variables;
use super::*;
use spectral::prelude::*;
#[test]
fn test_chain_of_helpers_with_1_param() -> Result<(), Error> {
let vs = Variables::new();
let hbs = new_hbs()?;
let tmpl = r#"{{ to_upper_case (to_singular "Hello foo-bars")}}"#.to_owned();
let actual = hbs.render_template(&tmpl, &vs)?;
assert_that!(&actual).is_equal_to("BAR".to_string());
Ok(())
}
fn assert_helpers(input: &str, helper_expected: Vec<(&str, &str)>) -> Result<(), Error> {
let mut vs = Variables::new();
vs.insert("var".into(), input.into());
let hbs = new_hbs()?;
for sample in helper_expected {
let tmpl = format!("{{{{ {} var}}}}", sample.0);
assert_that!(hbs.render_template(&tmpl, &vs)?)
.named(sample.0)
.is_equal_to(sample.1.to_owned());
}
Ok(())
}
#[test]
fn test_register_string_helpers() -> Result<(), Error> {
assert_helpers(
"Hello foo-bars",
vec![
("to_lower_case", "hello foo-bars"),
("to_upper_case", "HELLO FOO-BARS"),
("to_camel_case", "helloFooBars"),
("to_pascal_case", "HelloFooBars"),
("to_snake_case", "hello_foo_bars"),
("to_screaming_snake_case", "HELLO_FOO_BARS"),
("to_kebab_case", "hello-foo-bars"),
("to_train_case", "Hello-Foo-Bars"),
("to_sentence_case", "Hello foo bars"),
("to_title_case", "Hello Foo Bars"),
("to_class_case", "HelloFooBar"),
("to_table_case", "hello_foo_bars"),
("to_plural", "bars"),
("to_singular", "bar"),
],
)?;
Ok(())
}
#[test]
fn test_register_path_helpers() -> Result<(), Error> {
assert_helpers(
"/hello/bar/foo",
vec![
("file_name", "foo"),
("parent", "/hello/bar"),
("extension", ""),
("canonicalize", ""),
],
)?;
assert_helpers(
"foo",
vec![("file_name", "foo"), ("parent", ""), ("extension", "")],
)?;
assert_helpers(
"bar/foo",
vec![("file_name", "foo"), ("parent", "bar"), ("extension", "")],
)?;
assert_helpers(
"bar/foo.txt",
vec![
("file_name", "foo.txt"),
("parent", "bar"),
("extension", "txt"),
],
)?;
assert_helpers(
"./foo",
vec![
("file_name", "foo"),
("parent", "."),
("extension", ""),
("canonicalize", ""),
],
)?;
assert_helpers(
"/hello/bar/../foo",
vec![
("file_name", "foo"),
("parent", "/hello/bar/.."),
("extension", ""),
("canonicalize", ""),
],
)?;
Ok(())
}
}