pandoc-make: add error handling for if no files are given

.config/shell/bin/pandoc-make

@@ -60,12 +60,12 @@ for FILE in "$@";do
       # Guard against overwriting md files and tex files
       if { [[ "$OUTPUT_FORMAT" = md ]] || [[ "$OUTPUT_FORMAT" = tex ]]; } && [[ -f "$OUTPUT_FILE" ]]; then
          if confirm "Overwrite $FILE? [y/N]: "; then
-
             # Make new file names until there is no overwriting
             while [[ -f "$OUTPUT_FILE" ]]; do
                OUTPUT_FILE="${FILE%.*}-$((FILE_NUM++)).${OUTPUT_FORMAT##.}"
             done
             echo "Not overwriting, new name: '$OUTPUT_FILE'"
+
          else
             # Give some time to ctrl-c before overwrite…
             SLEEP_DURATION=1
@@ -87,4 +87,10 @@ for FILE in "$@";do
    fi
 done
 
+# Error if no files were processed
+if [ -z "$OUTPUT_FILE" ]; then
+   echo "Error: no files to process were found" >&2
+   exit 1
+fi
+
 # vim:et ts=3 sw=3