Add shfmt.sh

shfmt.sh

@@ -0,0 +1,39 @@
+set -uo pipefail
+IFS=$'\n\t'
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+source "$DIR/_reformat-common.bash"
+
+set -e
+
+file="$1"
+
+pushd "$(dirname "$file")" 2>&1
+
+if [[ "$WOULD_REFORMAT" = "would_reformat" ]]; then
+    # probably others too :(
+    syntax_error_retval=1
+
+    set +e
+    out=$(dart format -o none --set-exit-if-changed "$file"
+    retval="$?"
+    set -e
+
+    if [[ "$retval" = "$syntax_error_retval" ]]; then
+        retval=2
+    fi
+
+    exit "$retval"
+fi
+
+if [[ "$WOULD_REFORMAT" = "do_reformat" ]]; then
+    out=$(shfmt -w "$file" 2>&1 > /dev/null)
+    retval="$?"
+
+    echo "$out"
+    exit "$retval"
+fi
+
+exit 255
+