fix a few bugs and improve comments

uas.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 ########################################################################
-#  Copyright (C) 2018 Max Mehl <mail@mehl.mx>
+#  Copyright (C) 2019 Max Mehl <mail@mehl.mx>
 ########################################################################
 #  
 #  This program is free software: you can redistribute it and/or modify
@@ -24,7 +24,7 @@
 ########################################################################
 
 
-BASENAME=$(basename $0)
+BASENAME=$(basename "$0")
 
 # Load config
 BINDIR="$(dirname "$(readlink -f "$0")")"
@@ -38,34 +38,49 @@ if [ "$1" = "" ]; then
 fi
 
 # Transform to full path
+# file.pdf or /path/to/file.pdf
 FILE="$1"
-FILE_NAME=$(basename $FILE)
-FILE_PREFIX=${FILE_NAME%.*}
-FILE_SUFFIX=$([[ "$FILE_NAME" = *.* ]] && echo ".${FILE_NAME##*.}" || echo '')
+# -> file.pdf
+FILE_NAME="$(basename "${FILE}")"
+# -> file
+FILE_PREFIX="${FILE_NAME%.*}"
+# .pdf
+FILE_SUFFIX="$([[ "$FILE_NAME" = *.* ]] && echo ".${FILE_NAME##*.}" || echo '')"
 
-if [ ! -e "$FILE" ]; then
-    echo "File $FILE does not exist locally."
+# Check whether file actually exists locally
+if [ ! -e "${FILE}" ]; then
+    echo "File ${FILE} does not exist locally."
     exit 1
 fi
 
-i=1
-FILE_PREFIX_tmp="$FILE_PREFIX"
+# If the file already exists on the host, append a number and iterate if necessary
+i=0
+FILE_PREFIX_tmp="${FILE_PREFIX}"
 while [ "$ok" != "y" ]; do
-  DEST=$(echo "$FILE_PREFIX_tmp$FILE_SUFFIX" | sed 's/ /_/g')
-  ssh ${SSH_HOST} "test -e ${SSH_PATH}/$DEST"
-  if [ $? == 0 ]; then
-    FILE_PREFIX_tmp="$FILE_PREFIX"-${i}
+  # constuct file name, and replace spaces by underscores
+  DEST="$(echo "$FILE_PREFIX_tmp$FILE_SUFFIX" | sed 's/ /_/g')"
+  # Check if file is existent remotely
+  cmd="test -e \"${SSH_PATH}\"/\"${DEST}\""
+  # If file does already exist with this name
+  if ssh -q "${SSH_HOST}" "${cmd}"; then
+    # iterate number and append -<number> to file name in front of suffix
     ((i++))
+    FILE_PREFIX_tmp="$FILE_PREFIX"-${i}
     ok=n
+  # If file does not exist yet
   else
-    echo "A file with an identical name already exists in the remote directory."
-    echo "Your file will be renamed to prevent overwriting."
-    echo
+    # Only output this info if a rename took place
+    if [[ $i -gt 0 ]]; then
+      echo "A file with an identical name already exists in the remote directory."
+      echo "Your file has been renamed to prevent overwriting."
+      echo
+    fi
     ok=y
   fi
 done
 
-scp "$FILE" ${SSH_HOST}:${SSH_PATH}/"$DEST"
+# Upload file
+scp "$FILE" "${SSH_HOST}":"${SSH_PATH}"/"${DEST}"
 
 # Output download link
 echo "File has been uploaded. Download link:"