refactoring to library

src/lib.rs

@@ -0,0 +1,75 @@
+use structopt::StructOpt;
+use serde::{Serialize, Deserialize};
+use strum_macros::{Display, EnumString, EnumVariantNames};
+use tinytemplate::TinyTemplate;
+
+
+pub mod helpers;
+pub use helpers::*;
+
+pub mod drivers;
+pub use drivers::*;
+
+
+/// Compiled target triple, used as default for binary fetching
+pub const TARGET: &'static str = env!("TARGET");
+
+/// Default package path for use if no path is specified
+pub const DEFAULT_PKG_PATH: &'static str = "{ repo }/releases/download/v{ version }/{ name }-{ target }-v{ version }.{ format }";
+
+
+/// Binary format enumeration
+#[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Display, EnumString, EnumVariantNames)]
+#[strum(serialize_all = "snake_case")]
+#[serde(rename_all = "snake_case")]
+pub enum PkgFmt {
+    /// Download format is TAR (uncompressed)
+    Tar,
+    /// Download format is TGZ (TAR + GZip)
+    Tgz,
+    /// Download format is raw / binary
+    Bin,
+}
+
+
+/// Metadata for binary installation use.
+/// 
+/// Exposed via `[package.metadata]` in `Cargo.toml`
+#[derive(Clone, Debug, StructOpt, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct Meta {
+    /// Path template override for binary downloads
+    pub pkg_url: Option<String>,
+    /// Package name override for binary downloads
+    pub pkg_name: Option<String>,
+    /// Format override for binary downloads
+    pub pkg_fmt: Option<PkgFmt>,
+}
+
+
+/// Template for constructing download paths
+#[derive(Clone, Debug, Serialize)]
+pub struct Context {
+    pub name: String,
+    pub repo: Option<String>,
+    pub target: String,
+    pub version: String,
+    pub format: PkgFmt,
+}
+
+impl Context {
+    /// Render the context into the provided template
+    pub fn render(&self, template: &str) -> Result<String, anyhow::Error> {
+        // Create template instance
+        let mut tt = TinyTemplate::new();
+
+        // Add template to instance
+        tt.add_template("path", &template)?;
+
+        // Render output
+        let rendered = tt.render("path", self)?;
+
+        Ok(rendered)
+    }
+}