refactor: refactor inputs to context (#400)

* refactor: rename `inputs` to `context`

* refactor: merge compiler and flags inputs to options input

* refactor: separate configure and build context

src/context.ts

@@ -0,0 +1,74 @@
+import path from "node:path";
+
+export interface Context {
+  sourceDir: string;
+  buildDir: string;
+  configure: {
+    generator: string;
+    options: string[];
+    args: string[];
+  };
+  build: {
+    enabled: boolean;
+    args: string[];
+  };
+}
+
+/**
+ * Retrieves an action input.
+ * @param key - The key of the action input.
+ * @returns The action input value as a string.
+ */
+function getInput(key: string): string {
+  const value = process.env[`INPUT_${key.toUpperCase()}`] || "";
+  return value.trim();
+}
+
+export function getContext(): Context {
+  const sourceDir = getInput("source-dir");
+  const options: string[] = [];
+
+  let input = getInput("c-compiler");
+  if (input) options.push(`CMAKE_C_COMPILER=${input}`);
+
+  input = getInput("cxx-compiler");
+  if (input) options.push(`CMAKE_CXX_COMPILER=${input}`);
+
+  input = getInput("c-flags");
+  if (input) {
+    const flags = input.replaceAll(/\s+/g, " ");
+    options.push(`CMAKE_C_FLAGS=${flags}`);
+  }
+
+  input = getInput("cxx-flags");
+  if (input) {
+    const flags = input.replaceAll(/\s+/g, " ");
+    options.push(`CMAKE_CXX_FLAGS=${flags}`);
+  }
+
+  input = getInput("options");
+  if (input) {
+    const opts = input.split(/\s+/).filter((arg) => arg != "");
+    for (const opt of opts) {
+      options.push(opt);
+    }
+  }
+
+  return {
+    sourceDir,
+    buildDir: getInput("build-dir") || path.join(sourceDir, "build"),
+    configure: {
+      generator: getInput("generator"),
+      options,
+      args: getInput("args")
+        .split(/\s+/)
+        .filter((arg) => arg != ""),
+    },
+    build: {
+      enabled: getInput("run-build") == "true",
+      args: getInput("build-args")
+        .split(/\s+/)
+        .filter((arg) => arg != ""),
+    },
+  };
+}