feat: add template

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/drone-templater/Cargo.toml

@@ -13,3 +13,4 @@ dotenv.workspace = true
 reqwest = { version = "0.12.2", features = ["json"]}
 serde = { version = "1.0.197", features = ["derive"] }
 serde_json = "1.0.115"
+tera = "1.19.1"

crates/drone-templater/src/main.rs

@@ -1,4 +1,4 @@
-use std::path::PathBuf;
+use std::{collections::BTreeMap, path::PathBuf};
 
 use anyhow::anyhow;
 use clap::{Parser, Subcommand};
@@ -24,6 +24,9 @@ enum Commands {
 
         #[arg(long = "drone-user", env = "DRONE_USER")]
         drone_user: String,
+
+        #[arg(long = "variable", short = 'v')]
+        variables: Vec<String>,
     },
 }
 
@@ -40,10 +43,16 @@ async fn main() -> anyhow::Result<()> {
         drone_token,
         drone_host,
         drone_user,
+        variables,
     }) = cli.command
     {
         tracing::info!(template, drone_host, "executing drone upload");
 
+        let vars = variables
+            .iter()
+            .filter_map(|v| v.split_once('='))
+            .collect::<BTreeMap<&str, &str>>();
+
         let template_path = PathBuf::from(&template);
         if !template_path.exists() {
             anyhow::bail!("template: {} doesn't exist", template)
@@ -59,6 +68,13 @@ async fn main() -> anyhow::Result<()> {
             .expect("filename to be utf8");
         let template_data = tokio::fs::read_to_string(&template_path).await?;
 
+        let mut ctx = tera::Context::new();
+        for (name, val) in vars {
+            tracing::debug!("adding value to template: ({}, {})", &name, &val);
+            ctx.insert(name, val);
+        }
+        let template_data = tera::Tera::one_off(&template_data, &ctx, false)?;
+
         let template_url = format!(
             "{}/api/templates/{}/{}",
             drone_host.trim_end_matches('/'),