Rename file

This lets shellcheck make useful assumptions.

_reformat-common.bash

@@ -0,0 +1,37 @@
+function sniff_file_type() {
+    ff=$1
+    shift
+    file_type=
+
+    if [[ $ff == *.py ]]; then
+        file_type="python"
+    elif [[ $ff == *.js ]]; then
+        file_type="javascript"
+    elif [[ $ff == *.ts ]]; then
+        file_type="typescript"
+    elif [[ $ff == *.vue ]]; then
+        file_type="vue"
+    elif [[ $ff == *.css ]]; then
+        file_type="css"
+    elif [[ $ff == *.php ]]; then
+        file_type="php"
+    elif [[ $ff == *.html ]]; then
+        file_type="html"
+    elif [[ $ff == *.jsx ]]; then
+        file_type="jsx"
+    elif [[ $ff == *.tsx ]]; then
+        file_type="tsx"
+    elif [[ $ff == *.css ]] ; then
+        file_type="css"
+    elif [[ $ff == *.scss ]] ; then
+        file_type="scss"
+    elif [[ $ff = *.sh ]]; then
+        file_type="sh"
+    elif [[ $ff = *.go ]] ; then
+        file_type="golang"
+    elif [[ $ff = *.dart ]] ; then
+        file_type="dart"
+    fi
+
+    echo $file_type
+}