Split crates and clean up structure of codebase (#294)

Co-authored-by: Jiahao XU <Jiahao_XU@outlook.com>

crates/lib/src/manifests/cargo_toml_binstall.rs

@@ -0,0 +1,102 @@
+//! The format of the `[package.metadata.binstall]` manifest.
+//!
+//! This manifest defines how a particular binary crate may be installed by Binstall.
+
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+
+#[doc(inline)]
+pub use package_formats::*;
+
+mod package_formats;
+
+/// Default package path template (may be overridden in package Cargo.toml)
+pub const DEFAULT_PKG_URL: &str =
+    "{ repo }/releases/download/v{ version }/{ name }-{ target }-v{ version }.{ archive-format }";
+
+/// Default binary name template (may be overridden in package Cargo.toml)
+pub const DEFAULT_BIN_DIR: &str = "{ name }-{ target }-v{ version }/{ bin }{ binary-ext }";
+
+/// `binstall` metadata container
+///
+/// Required to nest metadata under `package.metadata.binstall`
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct Meta {
+    pub binstall: Option<PkgMeta>,
+}
+
+/// Metadata for binary installation use.
+///
+/// Exposed via `[package.metadata]` in `Cargo.toml`
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case", default)]
+pub struct PkgMeta {
+    /// URL template for package downloads
+    pub pkg_url: String,
+
+    /// Format for package downloads
+    pub pkg_fmt: PkgFmt,
+
+    /// Path template for binary files in packages
+    pub bin_dir: String,
+
+    /// Public key for package verification (base64 encoded)
+    pub pub_key: Option<String>,
+
+    /// Target specific overrides
+    pub overrides: HashMap<String, PkgOverride>,
+}
+
+impl Default for PkgMeta {
+    fn default() -> Self {
+        Self {
+            pkg_url: DEFAULT_PKG_URL.to_string(),
+            pkg_fmt: PkgFmt::default(),
+            bin_dir: DEFAULT_BIN_DIR.to_string(),
+            pub_key: None,
+            overrides: HashMap::new(),
+        }
+    }
+}
+
+impl PkgMeta {
+    /// Merge configuration overrides into object
+    pub fn merge(&mut self, pkg_override: &PkgOverride) {
+        if let Some(o) = &pkg_override.pkg_url {
+            self.pkg_url = o.clone();
+        }
+        if let Some(o) = &pkg_override.pkg_fmt {
+            self.pkg_fmt = *o;
+        }
+        if let Some(o) = &pkg_override.bin_dir {
+            self.bin_dir = o.clone();
+        }
+    }
+}
+
+/// Target specific overrides for binary installation
+///
+/// Exposed via `[package.metadata.TARGET]` in `Cargo.toml`
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case", default)]
+pub struct PkgOverride {
+    /// URL template override for package downloads
+    pub pkg_url: Option<String>,
+
+    /// Format override for package downloads
+    pub pkg_fmt: Option<PkgFmt>,
+
+    /// Path template override for binary files in packages
+    pub bin_dir: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct BinMeta {
+    /// Binary name
+    pub name: String,
+    /// Binary template path (within package)
+    pub path: String,
+}