Made more robust against unwanted escaping

bopher-ng.sh

@@ -40,6 +40,7 @@ fi
 
 # styling used in the TUI
 ESC=$'\x1b' # use the ANSI literal syntax to support in read prompts as well
+LF=$'\x0a' # let's do this
 ERESET="${ESC}[0m" # reset the styling
 ERRCOLOR="${ESC}[31;1m" # red bold
 LINKCOLOR="${ESC}[36;1m" # cyan bold
@@ -59,7 +60,7 @@ MOUSEOFF="${ESC}[?1000;1006l" # term command to stop sending mouse input events
 # button_attr;xcoord;ycoord[Mm]
 
 clear_term() { # clear the terminal on Ctrl+C interrupt
-  printf '%b' "$MOUSEOFF$ERESET$ALTBUFOFF"
+  printf '%s' "$MOUSEOFF$ERESET$ALTBUFOFF"
   exit 0
 }
 trap clear_term INT
@@ -174,12 +175,12 @@ amrender() {
     local action="${fields[0]}" # to display an AM entry, we only need two of its fields
     local desc="${fields[1]}"
     if [[ 'E' == "$action" ]]; then # plain text
-      output="${output}$desc\n"
+      output="${output}${desc}${LF}"
     else # not plain text
       if [[ "$idx" == "$FOCUSLINEINDEX" ]]; then # if the current link is focused, then...
-        output="${output}$FOCUSATTR" # print the focus attribute (the link contains ERESET anyway)
+        output="${output}${FOCUSATTR}" # print the focus attribute (the link contains ERESET anyway)
       fi
-      output="${output}$LINKCOLOR=> ${desc}$ERESET\n"
+      output="${output}${LINKCOLOR}=> ${desc}${ERESET}${LF}"
     fi
   done
   # final preparations:
@@ -187,7 +188,7 @@ amrender() {
   # - output current resource to the status line
   # - reset the cursor once again
   output="${output}$BELOWCLR${ESC}[$TERMROWS;0H$FOCUSATTR$(amtogopher "$CURRENTAM")$ERESET${ESC}[$TERMROWS;0H" 
-  printf '%b' "$output" # finally, print the entire output with a single call
+  printf '%s' "$output" # finally, print the entire output with a single call
 }
 trap 'amrender' WINCH # rerender on terminal size change
 
@@ -221,7 +222,7 @@ jumplink() { # args: delta (usually 1 or -1)
 
 amload() { # args: AM line[, forcedl]
   CURRENTAM="$1" # update current AM value
-  printf '%b' "${LINECLR}Loading..."
+  printf '%s' "${LINECLR}Loading..."
   readarray -t SCREENBUF < <(amclick "$CURRENTAM" "$2") # populate screen buffer by loading the resource from the AM entry
   NAVIGABLES=() # reset the navigable indexes
   CURLINKINDEX=0 # reset the link number
@@ -258,7 +259,7 @@ goback() { # remove the last AM line from history and go there
 stashlink() { # stash the link to the currently viewed resource
   local gopherlink="$(amtogopher "$CURRENTAM")" 
   printf '[%s] %s\n' "$(date -u '+%F %T')" "$gopherlink" >> $BOPHER_LINKSTASH
-  printf 'Stashed %s%b' "$gopherlink" "$ERESET${ESC}[$TERMROWS;0H" # just reset the cursor to the last line
+  printf 'Stashed %s%s' "$gopherlink" "$ERESET${ESC}[$TERMROWS;0H" # just reset the cursor to the last line
 }
 
 # Focus and click a link on a Gophermap
@@ -296,7 +297,7 @@ readmouseinput() { # correctly read the remaining mouse input in semi-long mode
 
 # entry point code starts here
 
-printf '%b' "$ALTBUFON$CLS" # enter ALTBUF mode and clear the screen
+printf '%s' "$ALTBUFON$CLS" # enter ALTBUF mode and clear the screen
 
 # now, load the resource provided from the command line and start the main loop
 
@@ -311,15 +312,15 @@ mouseY=''
 mouseStatus='M'  
 while true; do
   mousecmd='' # mouse command buffer
-  printf '%b' "$MOUSEON" # enable mouse events before reading
+  printf '%s' "$MOUSEON" # enable mouse events before reading
   read -n 1 -s cmdbuf # read the character, tildas will be ignored
   if [[ "$cmdbuf" == $'\x1b' ]]; then # here's the control character
     read -n 2 -s cmdbuf # read 2 additional characters
-    if [[ "$cmdbuf" == "[<" ]]; then # we have a mouse event, read the button attribute and the coordinates
+    if [[ "$cmdbuf" == '[<' ]]; then # we have a mouse event, read the button attribute and the coordinates
       read -r -s mousecmd mouseX mouseY mouseStatus < <(readmouseinput)
     fi
   fi
-  printf '%b' "$MOUSEOFF" # don't generate mouse events outside the input sequence
+  printf '%s' "$MOUSEOFF" # don't generate mouse events outside the input sequence
   [[ "$mousecmd" == '2' && "$mouseStatus" == 'M' ]] && cmdbuf='b' # right click is automatically assigned to back command
   [[ "$cmdbuf" == '[A' || "$cmdbuf" == 'k'  || "$mousecmd" == '64' ]] && scroll -1
   [[ "$cmdbuf" == '[B' || "$cmdbuf" == 'j' || "$mousecmd" == '65' ]] && scroll 1
@@ -327,8 +328,8 @@ while true; do
   [[ "$cmdbuf" == '[6' || "$cmdbuf" == 'l' ]] && scroll $(( $TERMROWS - 1 )) # PgDn
   [[ "$cmdbuf" == 's' ]] && jumplink 1
   [[ "$cmdbuf" == 'w' ]] && jumplink -1
-  [[ "$cmdbuf" == 'q' ]] && printf '%b' "$ERESET$ALTBUFOFF" && exit 0
-  [[ "$cmdbuf" == $'\0a' ]] && clicklink
+  [[ "$cmdbuf" == 'q' ]] && printf '%s' "$ERESET$ALTBUFOFF" && exit 0
+  [[ "$cmdbuf" == '' ]] && clicklink # space or enter or tab
   [[ "$cmdbuf" == 'd' ]] && clicklink 1 # same as click but with force-download flag
   [[ "$cmdbuf" == 'b' ]] && goback
   [[ "$cmdbuf" == 'S' ]] && stashlink