move gcovr.check to deps

src/deps.ts

@@ -2,13 +2,14 @@ import * as core from "@actions/core";
 import * as exec from "@actions/exec";
 import * as io from "@actions/io";
 import * as os from "os";
+import * as action from "./action";
 
-async function isAvailable(tool: string): Promise<boolean> {
+async function isMissing(tool: string): Promise<boolean> {
   try {
     await io.which(tool, true);
-    return true;
-  } catch {
     return false;
+  } catch {
+    return true;
   }
 }
 
@@ -24,6 +25,10 @@ async function brewInstall(pkg: string) {
   await exec.exec("brew", ["install", pkg]);
 }
 
+async function pipInstall(pkg: string) {
+  await exec.exec("pip3", ["install", pkg]);
+}
+
 async function smartInstall(pkg: string) {
   switch (os.type()) {
     case "Windows_NT":
@@ -40,11 +45,27 @@ async function smartInstall(pkg: string) {
   }
 }
 
-export async function checkLlvm() {
-  const available = await isAvailable("llvm-cov");
-  if (!available) {
+async function checkGcovr() {
+  if (await isMissing("llvm-cov")) {
+    await core.group("Install gcovr", async () => {
+      await pipInstall("gcovr");
+    });
+  }
+}
+
+async function checkLlvm() {
+  if (await isMissing("llvm-cov")) {
     await core.group("Install LLVM", async () => {
       await smartInstall("llvm");
     });
   }
 }
+
+export async function check(inputs: action.Inputs) {
+  await checkGcovr();
+  if (inputs.gcovExecutable !== null) {
+    if (inputs.gcovExecutable.includes("llvm-cov")) {
+      await checkLlvm();
+    }
+  }
+}

src/gcovr.ts

@@ -1,19 +1,7 @@
 import * as core from "@actions/core";
 import * as exec from "@actions/exec";
-import * as io from "@actions/io";
 import * as action from "./action";
 
-export async function check() {
-  try {
-    await io.which("gcovr", true);
-  } catch {
-    // gcovr is not available, installing
-    await core.group("Install gcovr", async () => {
-      await exec.exec("pip3 install gcovr");
-    });
-  }
-}
-
 function getArgs(inputs: action.Inputs): string[] {
   let args: string[] = [];
   if (inputs.root !== null) {

src/main.ts

@@ -6,13 +6,7 @@ import * as gcovr from "./gcovr";
 async function run(): Promise<void> {
   try {
     const inputs = action.parseInputs();
-    await gcovr.check();
-    if (
-      inputs.gcovExecutable !== null &&
-      inputs.gcovExecutable.includes("llvm-cov")
-    ) {
-      await deps.checkLlvm();
-    }
+    await deps.check(inputs);
     await gcovr.run(inputs);
   } catch (error) {
     if (error instanceof Error) core.setFailed(error.message);