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[bash] Zenity loop (raspbian)

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Top Forums Shell Programming and Scripting [bash] Zenity loop (raspbian)
# 1  
Old 10-04-2016
[bash] Zenity loop (raspbian)
Hello folks,

I have created a GUI but i face some issue with the loop either i am stuck in the loop or it close the program



In the code below it work fine for the "go to menu" if i press cancel i go back to the main menu but for "test" i m stuck in the menu

Appreciate some help :/
Code:
#!/bin/bash
 
while true; do
  choice="$(zenity --width=200 --height=150 --list --column "" --title="test" \
  "Go to next menu" \
 "test"
  "Exit ")"
 
  case "${choice}" in
    "Go to next menu" )
      while true; do
        choice2="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"
 
        case "${choice2}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
          *)
            break
          ;;
        esac
      done
    ;;
    *)
      break
    ;;
esac
done
 
while true; do
  case "${choice}" in
    "test" )
 
      while true; do
        choice3="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"
 
        case "${choice3}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
 
          *)
            break
          ;;
 
        esac
      done
 
    ;;
    *)
      break
    ;;
  esac
done

# 2  
Old 10-04-2016
Not sure I fully understand the logics you tried to put into your script, but it seems there may be a flaw in it:
You have two sequential while loops; in the first you "read" a value into choice and then run a case statement on that variable, breaking out of the loop unless "Go to next menu" is selected. When entering the second loop, choice is never modified; so, if it holds "test" it is in an infinite loop. Any other value will make it break out immediately.
Last edited by RudiC; 10-04-2016 at 11:00 AM..
# 3  
Old 10-04-2016
well i got lost trying to make it work.

I woul like a main menu to redirect to sub menu .

I don't understand how to make a loop for the second menu in order to get back to the main when i press cancel.

I also try this but only " go to menu" appear on the main

Code:
#!/bin/bash
 
while true; do
  choi1="$(zenity --width=200 --height=150 --list --column "" --title="test" \
  "Go to next menu" \	
 
 
  "Exit ")"
 
  case "${choi1}" in
    "Go to next menu" )
      while true; do
        choi1="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"
 
        case "${choi1}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
          *)
            break
          ;;
        esac
      done
    ;;
    *)
      break
    ;;
esac
done
 
while true; do
  choi2="$(zenity --width=200 --height=150 --list --column "" --title="test" \
  "test2" 
 
case "${choi2}" in
    "test2" )
      while true; do
        choi2="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"
 
        case "${choi2}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
 
		 *)
 
            break
 
          ;;
        esac
      done
    ;;
 
 
     *)
      break
    ;;
esac
done

# 4  
Old 10-04-2016
Don't create a second "while true" loop, but make another entry "test" in the first loop's case ... esac statement, and, below it, the sub menu.
# 5  
Old 10-04-2016
okay so should look like this?

Code:
#!/bin/bash

while true; do
  choice="$(zenity --width=200 --height=150 --list --column "" --title="test" \
  "Go to next menu" \
 "test"
  "Exit ")"

  case "${choice}" in
    "Go to next menu" )
      while true; do
        choice2="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"

        case "${choice2}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
          *)
            break
          ;;
        esac
      done
    ;;
    *)
      break

    ;;
esac
done

  case "${choice}" in
    "test" )
      while true; do
        choice3="$(zenity --width=200 --height=150 --list --column "" --title="test" \
        "Do Something" \
        "Do Something Else " \
        "Back")"

        case "${choice3}" in
          "Do Something" )
            echo "hello"
          ;;
          "Do Something Else " )
            echo "hello"
          ;;
          *)
            break
          ;;
        esac
      done
    ;;
    *)
      break
    ;;
  esac
done

if i remove the first esac done (the one outisiide the case)the progrmam does not start then if i put it a the end same issue
in this code i the loop only work for "go to menu"
# 6  
Old 10-04-2016
NO. Just one single outer case ... esac.
Just to SEE the logics, try a top-down approach:

Code:
while true
  do    read choice
        case $choice in
                "go to menu")   ... ;;
                "test")         ... ;;
                "exit")         ... ;;
                *)              error handling ;;
        esac
  done

, then refine/detail each of the menu items. As you can see, proper indenting helps to follow the logics and keeps things together that belong together.
# 7  
Old 10-04-2016
I would suggest that having to rely on break is probably a bad idea. The only place where i think it might be the only solution is within a select loop.

I would suggest that you change your loop from a while true to being based on a condition that is initialised and then changed when you want to leave the loop.

Code:
keep_looping=1
while [ $keep_looping -eq 1 ]
do
   ...
   ...
   ...
   if [ some condition ]
   then
      echo "Leaving loop"
      keep_looping=0
   fi
done
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