Add helper type for passing data to Handlebars::render()

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

3 files changed, 43 insertions, 0 deletions

diff --git a/lib/etc/libimaginteraction/Cargo.toml b/lib/etc/libimaginteraction/Cargo.toml
index ac4a952c..01c6e0c7 100644
--- a/lib/etc/libimaginteraction/Cargo.toml
+++ b/lib/etc/libimaginteraction/Cargo.toml
@@ -28,6 +28,8 @@ regex = "1.1.7"
 toml = "0.5.1"
 handlebars = "2"
 serde_json = "1.0.39"
+serde_derive = "1"
+serde = "1"
 failure        = "0.1.5"
 failure_derive = "0.1.5"
 
diff --git a/lib/etc/libimaginteraction/src/format.rs b/lib/etc/libimaginteraction/src/format.rs
index 0f38257e..6515df2d 100644
--- a/lib/etc/libimaginteraction/src/format.rs
+++ b/lib/etc/libimaginteraction/src/format.rs
@@ -23,6 +23,45 @@ use serde_json::value::Value;
 use ansi_term::Colour;
 use ansi_term::Style;
 
+/// Helper type for passing data to handlebars
+///
+/// This helper type can be used to fill a BtreeMap<String, HandlebarsData> which is then passed to
+/// Handlebars::render() for passing data to the template string.
+///
+#[derive(Clone, Debug, Serialize)]
+#[serde(untagged)]
+pub enum HandlebarsData {
+    Bool(bool),
+    Int(usize),
+    Float(f64),
+    Str(String),
+}
+
+impl From<bool> for HandlebarsData {
+    fn from(b: bool) -> Self {
+        HandlebarsData::Bool(b)
+    }
+}
+
+impl From<usize> for HandlebarsData {
+    fn from(u: usize) -> Self {
+        HandlebarsData::Int(u)
+    }
+}
+
+impl From<f64> for HandlebarsData {
+    fn from(f: f64) -> Self {
+        HandlebarsData::Float(f)
+    }
+}
+
+impl From<String> for HandlebarsData {
+    fn from(s: String) -> Self {
+        HandlebarsData::Str(s)
+    }
+}
+
+
 #[derive(Clone, Copy)]
 pub struct ColorizeBlackHelper;
 
diff --git a/lib/etc/libimaginteraction/src/lib.rs b/lib/etc/libimaginteraction/src/lib.rs
index 36dceb17..980ab92c 100644
--- a/lib/etc/libimaginteraction/src/lib.rs
+++ b/lib/etc/libimaginteraction/src/lib.rs
@@ -44,6 +44,8 @@ extern crate regex;
 extern crate clap;
 extern crate toml;
 extern crate handlebars;
+extern crate serde;
+#[macro_use] extern crate serde_derive;
 extern crate serde_json;
 extern crate failure;