add ci, silence invalid warning

.github/workflows/main.yml

@@ -0,0 +1,9 @@
+name: Shellcheck
+on: [push, pull_request]
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v1
+            - name: Run shellcheck.
+              run: shellcheck shfm

shfm

@@ -15,8 +15,12 @@ term_reset() {
 }
 
 term_resize() {
-    set -f
-    set +f -- $(stty size)
+    # false-positive, behavior intentional, globbing is disabled.
+    # shellcheck disable=2046
+    {
+        set -f
+        set +f -- $(stty size)
+    }
 
     LINES=$1 COLUMNS=$2