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use crate::outputs::StringOutput;
use handlebars::{Context, Handlebars, Helper, HelperResult, Output, RenderContext, Renderable};
use jsonnet::JsonnetVm;
use thiserror::Error;
#[derive(Debug, Error)]
enum JsonnetError {
#[error("jsonnet evaluation failed: {source_str}")]
EvaluateError { source_str: String },
}
#[allow(clippy::let_and_return)]
fn jsonnet_block<'reg, 'rc>(
h: &Helper<'rc>,
r: &'reg Handlebars,
ctx: &'rc Context,
rc: &mut RenderContext<'reg, 'rc>,
out: &mut dyn Output,
) -> HelperResult {
let mut content = StringOutput::default();
h.template()
.map(|t| t.render(r, ctx, rc, &mut content))
.unwrap_or(Ok(()))?;
let input = content.into_string()?;
let res = if input.is_empty() {
input
} else {
let mut vm = JsonnetVm::new();
vm.string_output(
h.hash_get("string_output")
.and_then(|v| v.value().as_bool())
.unwrap_or(false),
);
// vm.fmt_indent(
// h.hash_get("indent")
// .and_then(|v| v.value().as_u64())
// .unwrap_or(4) as u32,
// );
let s = vm
.evaluate_snippet("snippet", &input)
.map_err(|e| {
crate::to_nested_error(JsonnetError::EvaluateError {
source_str: format!("{:?}", e),
})
})?
.to_string();
s
};
out.write(&res).map_err(crate::to_nested_error)
}
pub fn register(handlebars: &mut Handlebars) {
handlebars.register_helper("jsonnet", Box::new(jsonnet_block));
}
#[cfg(test)]
mod tests {
//use super::*;
use crate::assert_renders;
use crate::tests::normalize_nl;
use std::error::Error;
#[test]
fn test_jsonnet_block() -> Result<(), Box<dyn Error>> {
assert_renders![
(r##"{{#jsonnet}}{{/jsonnet}}"##, r##""##),
(
r##"{{#jsonnet}}{"foo":{"bar":{"baz":true}}}{{/jsonnet}}"##,
&normalize_nl(
r##"{
"foo": {
"bar": {
"baz": true
}
}
}
"##
)
),
(
r##"{{#jsonnet}}
local v = {"foo":{"bar":{"baz":false}}};
v
{{/jsonnet}}"##,
&normalize_nl(
r##"{
"foo": {
"bar": {
"baz": false
}
}
}
"##
)
),
(
r##"{{#jsonnet}}
local v = {"foo":{"bar":{"baz":false}}};
v {
"v": 3,
"vv" +: {
"vvv": 333
}
}
{{/jsonnet}}"##,
&normalize_nl(
r##"{
"foo": {
"bar": {
"baz": false
}
},
"v": 3,
"vv": {
"vvv": 333
}
}
"##
)
),
(
r##"{{#jsonnet}}
local v = {"foo":{"bar":{"baz":false}}};
v {
"foo" +: {
"bar" +: {
"baz": true
}
}
}
{{/jsonnet}}"##,
&normalize_nl(
r##"{
"foo": {
"bar": {
"baz": true
}
}
}
"##
)
),
(
r##"{{#jsonnet}}
local v = {"foo":{"bar":{"baz":false}}};
v {
"foo" +: {
"bar" +: {
"baz2": true
}
}
}
{{/jsonnet}}"##,
&normalize_nl(
r##"{
"foo": {
"bar": {
"baz": false,
"baz2": true
}
}
}
"##
)
),
]
}
}