Some of the shell script fixes as per discussion (#389)

* Improved completion support for files with spaces

Filenames with spaces, both generally and for session names, will now
complete as expected.

* Misc shell script improvements

See discussion on:
1cca9e4b72

misc/auto-completion/bash/nnn-completion.bash

@@ -8,7 +8,7 @@
 _nnn ()
 {
     COMPREPLY=()
-    local IFS=$' \n'
+    local IFS=$'\n'
     local cur=$2 prev=$3
     local -a opts
     opts=(
@@ -37,7 +37,7 @@ _nnn ()
         COMPREPLY=( $(compgen -f -d -- "$cur") )
     elif [[ $prev == -e ]]; then
         local sessions_dir=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/sessions
-        COMPREPLY=( $(compgen -W "$(ls "$sessions_dir")" -- "$cur") )
+        COMPREPLY=( $(cd "$sessions_dir" && compgen -f -d -- "$cur") )
     elif [[ $cur == -* ]]; then
         COMPREPLY=( $(compgen -W "${opts[*]}" -- "$cur") )
     else

misc/quitcd/quitcd.bash

@@ -1,14 +1,14 @@
 n ()
 {
     # Block nesting of nnn in subshells
-    if [ "$((NNNLVL + 0))" -ge 1 ]; then
+    if [ "${NNNLVL:-0}" -ge 1 ]; then
         echo "nnn is already running"
         return
     fi
 
     # The default behaviour is to cd on quit (nnn checks if NNN_TMPFILE is set)
     # To cd on quit only on ^G, export NNN_TMPFILE after the call to nnn
-    export NNN_TMPFILE=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd
+    export NNN_TMPFILE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd"
 
     # Unmask ^Q (, ^V etc.) (if required, see `stty -a`) to Quit nnn
     # stty start undef

misc/quitcd/quitcd.zsh

@@ -1,14 +1,14 @@
 n ()
 {
     # Block nesting of nnn in subshells
-    if [ "$((NNNLVL + 0))" -ge 1 ]; then
+    if [ "${NNNLVL:-0}" -ge 1 ]; then
         echo "nnn is already running"
         return
     fi
 
     # The default behaviour is to cd on quit (nnn checks if NNN_TMPFILE is set)
     # To cd on quit only on ^G, export NNN_TMPFILE after the call to nnn
-    export NNN_TMPFILE=${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd
+    export NNN_TMPFILE="${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.lastd"
 
     # Unmask ^Q (, ^V etc.) (if required, see `stty -a`) to Quit nnn
     # stty start undef

plugins/dragdrop

@@ -24,8 +24,7 @@ fi
 
 add_file ()
 {
-	printf "%s" "$@" >> "$selection"
-	printf "\0" >> "$selection"
+    printf '%s\0' "$@" >> "$selection"
 }
 
 use_all ()
@@ -57,7 +56,7 @@ elif [ "$resp" = "d" ]; then
     use_all
     "$dnd" "$all" "$PWD/"* &
 elif [ "$resp" = "r" ]; then
-    printf > "$selection"
+    true > "$selection"
     "$dnd" --print-path --target | while read -r f
     do
             if printf "%s" "$f" | grep '^\(https\?\|ftps\?\|s\?ftp\):\/\/' ; then

plugins/fzcd

@@ -18,18 +18,17 @@ if [ "$(cmd_exists fzy)" -eq "0" ]; then
 
 	sel=$($fd | fzy)
 elif [ "$(cmd_exists fzf)" -eq "0" ]; then
-	sel=$(fzf --print0)
+	sel=$(fzf)
 else
 	exit 1
 fi
 
-if ! [ -z "$sel" ]; then
-	case "$(file -bi "$sel")" in
-		*directory*) ;;
-		*) sel=$(dirname "$sel") ;;
-	esac
+if [ -n "$sel" ]; then
+	if ! [ -d "$sel" ]; then
+		sel=$(dirname "$sel")
+	fi
 
-    # Remove "./" prefix
-    sel="$(echo "$sel" | cut -c 3-)"
+    # Remove "./" prefix if it exists
+    sel="${sel#./}"
 	nnn_cd "$PWD/$sel"
 fi

plugins/gutenread

@@ -19,29 +19,29 @@
 # Author: Arun Prakash Jana
 
 EBOOK_ID=
-DIR=${XDG_CACHE_HOME:-$HOME/.cache}/nnn/gutenbooks/"$EBOOK_ID"
+DIR="${XDG_CACHE_HOME:-$HOME/.cache}/nnn/gutenbooks/$EBOOK_ID"
 BROWSE_LINK="http://www.gutenberg.org/ebooks/search/?sort_order=downloads"
 BROWSER=w3m
 READER=
 
-if [ ! -z "$EBOOK_ID" ]; then
+if [ -n "$EBOOK_ID" ]; then
     if [ ! -e "$DIR" ]; then
         mkdir -p "$DIR"
         cd "$DIR" || exit 1
 
         if [ -z "$READER" ]; then
-            curl -L -O https://www.gutenberg.org/files/"$EBOOK_ID"/"$EBOOK_ID"-h.zip
+            curl -L -O "https://www.gutenberg.org/files/$EBOOK_ID/$EBOOK_ID-h.zip"
             unzip "$EBOOK_ID"-h.zip
         else
-            curl -L -o "$EBOOK_ID".epub http://www.gutenberg.org/ebooks/"$EBOOK_ID".epub.noimages
+            curl -L -o "$EBOOK_ID".epub "http://www.gutenberg.org/ebooks/$EBOOK_ID.epub.noimages"
         fi
     fi
 
     if [ -d "$DIR" ]; then
         if [ -z "$READER" ]; then
-            "$BROWSER" "$DIR"/"$EBOOK_ID"-h/"$EBOOK_ID"-h.htm
+            "$BROWSER" "$DIR/$EBOOK_ID-h/$EBOOK_ID-h.htm"
         else
-            "$READER" "$DIR"/"$EBOOK_ID".epub
+            "$READER" "$DIR/$EBOOK_ID.epub"
         fi
     fi
 else

plugins/imgur

@@ -77,23 +77,16 @@ upload_connect_timeout="5"
 upload_timeout="120"
 upload_retries="1"
 
+# shellcheck disable=SC2034
 if is_mac; then
-  # shellcheck disable=SC2034
   screenshot_select_command="screencapture -i %img"
-  # shellcheck disable=SC2034
   screenshot_window_command="screencapture -iWa %img"
-  # shellcheck disable=SC2034
   screenshot_full_command="screencapture %img"
-  # shellcheck disable=SC2034
   open_command="open %url"
 else
-  # shellcheck disable=SC2034
   screenshot_select_command="scrot -s %img"
-  # shellcheck disable=SC2034
   screenshot_window_command="scrot %img"
-  # shellcheck disable=SC2034
   screenshot_full_command="scrot %img"
-  # shellcheck disable=SC2034
   open_command="xdg-open %url"
 fi
 open="true"
@@ -169,8 +162,7 @@ function take_screenshot() {
   cmd="screenshot_${mode}_command"
   cmd=${!cmd//\%img/${1}}
 
-  shot_err="$(${cmd} &>/dev/null)" #takes a screenshot with selection
-  if ! [ -z "$shot_err" ]; then
+  if ! shot_err="$(${cmd} &>/dev/null)"; then  #takes a screenshot with selection
     echo "Failed to take screenshot '${1}': '${shot_err}'. For more information visit https://github.com/jomo/imgur-screenshot/wiki/Troubleshooting" | tee -a "${log_file}"
     notify error "Something went wrong :(" "Information has been logged"
     exit 1
@@ -256,8 +248,13 @@ function refresh_access_token() {
   check_oauth2_client_secrets
   token_url="https://api.imgur.com/oauth2/token"
   # exchange the refresh token for access_token and refresh_token
-  response="$(curl --compressed -fsSL --stderr - -F "client_id=${imgur_acct_key}" -F "client_secret=${imgur_secret}" -F "grant_type=refresh_token" -F "refresh_token=${refresh_token}" "${token_url}")"
-  if ! [ -z "$response" ]; then
+  if ! response="$(curl --compressed -fsSL --stderr - \
+                    -F "client_id=${imgur_acct_key}" \
+                    -F "client_secret=${imgur_secret}" \
+                    -F "grant_type=refresh_token" \
+                    -F "refresh_token=${refresh_token}" \
+                    "${token_url}"
+                    )"; then
     # curl failed
     handle_upload_error "${response}" "${token_url}"
     exit 1