refactor: restructure project into a workspace by introducing a plugin API crate and modularizing individual plugin definitions.

plugin-build.rs

@@ -0,0 +1,29 @@
+// Copyright (C) 2026 Elias Wendland <eliaswendland@pm.me>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3 exclusively.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+use std::process::Command;
+
+fn main() {
+    let rustc = std::env::var("RUSTC").unwrap_or_else(|_| "rustc".to_owned());
+    let version = Command::new(rustc)
+        .arg("--version")
+        .output()
+        .ok()
+        .filter(|output| output.status.success())
+        .map(|output| String::from_utf8_lossy(&output.stdout).trim().to_owned())
+        .unwrap_or_else(|| "unknown".to_owned());
+    let target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_owned());
+    println!("cargo:rustc-env=CONVERTIS_RUSTC_VERSION={version}");
+    println!("cargo:rustc-env=CONVERTIS_TARGET={target}");
+}