Fixes #32 Globber will now expand tilde and warn if no results are found

src/ArtifactGlobber.ts

@@ -1,5 +1,7 @@
-import { Globber, FileGlobber } from "./Globber";
-import { Artifact } from "./Artifact";
+import * as core from '@actions/core';
+import {Globber, FileGlobber} from "./Globber";
+import {Artifact} from "./Artifact";
+import untildify from "untildify";
 
 export interface ArtifactGlobber {
     globArtifactString(artifact: string, contentType: string): Artifact[]
@@ -14,9 +16,25 @@ export class FileArtifactGlobber implements ArtifactGlobber {
 
     globArtifactString(artifact: string, contentType: string): Artifact[] {
         return artifact.split(',')
-            .map((path) => this.globber.glob(path))
+            .map(path => FileArtifactGlobber.expandPath(path))
+            .map(pattern => this.globPattern(pattern))
             .reduce((accumulated, current) => accumulated.concat(current))
-            .map((path) => new Artifact(path, contentType))
+            .map(path => new Artifact(path, contentType))
     }
-}
 
+    private globPattern(pattern: string): string[] {
+        const paths = this.globber.glob(pattern)
+        if (paths.length == 0) {
+            FileArtifactGlobber.reportGlobWarning(pattern)
+        }
+        return paths
+    }
+
+    private static reportGlobWarning(pattern: string) {
+        core.warning(`Artifact pattern :${pattern} did not match any files`)
+    }
+
+    private static expandPath(path: string): string {
+        return untildify(path)
+    }
+}