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Help function of "dialog"

Hi all,

I'm currently writing some bash scripts using the "dialog" functionality to enhance the user experience on the command line.

All is going well, but there is one problem I cannot sort out and little info is found via Google, that is, the help system of dialog. There are options to show a help button and when the user selects it, the corresponding help text appears.

I can get the button to shop up, but there is no documentation on how to show the corresponding help text into a box. Dialog just quits with "HELP:".

Does anyone here on the forums have any usable knowledge about the help functionality of dialog and is willing to help me out?

Thanks in advance and should you need more information, please ask, so I can supply it.

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Comments

  • Hmm, I haven't thought about that strategy yet. Though it is a bit cumbersome, especially when handling multiple actions and various dialog boxes. I would have to think about a good strategy for that.

    Another question, if I read the help correctly, it should be possible to keep the originating window and place the help window on top of that. Do you have any idea to accomplish this?

    Thanks already for your help!
  • Posts: 15
    edited November 2011
    That's possible, I'm only pasting the part of what's relevant, since it's a huge script by now :)
    1. #!/bin/bash
    2. escaper()
    3. {
    4. action=$?
    5. if [ $action = 1 -o $action = 255 ];
    6. then
    7. dialog --title "$title" --yesno "\nAre you sure you want to quit?" 7 35
    8. sure=$?
    9. if [ $sure = 0 ];
    10. then
    11. clear
    12. exit
    13. fi
    14. fi
    15. }
    16. genhour()
    17. {
    18. genhour=9
    19. hour=$RANDOM
    20. let "hour %= $genhour"
    21. }
    22. genminute()
    23. {
    24. genminute=59
    25. minute=$RANDOM
    26. let "minute %= $genminute"
    27. }
    28. pid=$(echo $$)
    29. if [ -z $1 ];
    30. then
    31. genhour
    32. genminute
    33. dialog --backtitle "$backtitle" --title "$title" --keep-window --form "\nYour Backup Account Details\n" 20 60 0 \
    34. "Username....:" 1 1 "" 1 15 14 0 \
    35. "Password....:" 2 1 "" 2 15 14 0 \
    36. "Server......:" 3 1 "" 3 15 30 0 \
    37. "Backup root.:" 4 1 "/" 4 15 30 0 \
    38. "Weeks.......:" 5 1 "0" 5 15 2 0 \
    39. "Months......:" 6 1 "0" 6 15 2 0 \
    40. "MySQL dumps.:" 7 1 "$mysqldumps" 7 15 1 0 \
    41. "SQL Dir.....:" 8 1 "/var/sqlbackups/" 8 15 30 0 \
    42. "Cron (HH)...:" 9 1 "$hour" 9 15 2 0 \
    43. "Cron (MM)...:" 10 1 "$minute" 10 15 2 0 \
    44. "Logging.....:" 11 1 "Y" 11 15 1 0 \
    45. "Email log...:" 12 1 "N" 12 15 1 0 \
    46. "Emailaddress:" 13 1 "" 13 15 30 0 2> /tmp/$pid-options
    47. escaper
    48. choice=$?
    49. array=( `cat /tmp/$pid-options `)
    50. if [ -f /tmp/$pid-options ];
    51. then
    52. rm /tmp/$pid-options > /dev/null 2> /dev/null
    53. fi
    54. while ! [ ${#array[@]} = 13 ]
    55. do
    56. dialog --backtitle "$backtitle" --title "$title" --msgbox "\nNot all fields are populated!\n\nPlease make sure you fill in all the fields." 10 50; clear
    57. genhour
    58. genminute
    59. dialog --backtitle "$backtitle" --title "$title" --keep-window --form "\nYour Backup Account Details\n" 20 60 0 \
    60. "Username....:" 1 1 "" 1 15 14 0 \
    61. "Password....:" 2 1 "" 2 15 14 0 \
    62. "Server......:" 3 1 "" 3 15 30 0 \
    63. "Backup root.:" 4 1 "$defaultbackuppath" 4 15 30 0 \
    64. "Weeks.......:" 5 1 "0" 5 15 2 0 \
    65. "Months......:" 6 1 "0" 6 15 2 0 \
    66. "MySQL dumps.:" 7 1 "$mysqldumps" 7 15 1 0 \
    67. "SQL Dir.....:" 8 1 "/var/sqlbackups/" 8 15 30 0 \
    68. "Cron (HH)...:" 9 1 "$hour" 9 15 2 0 \
    69. "Cron (MM)...:" 10 1 "$minute" 10 15 2 0 \
    70. "Logging.....:" 11 1 "Y" 11 15 1 0 \
    71. "Email log...:" 12 1 "N" 12 15 1 0 \
    72. "Emailaddress:" 13 1 "" 13 15 30 0 2> /tmp/$pid-options
    73. escaper
    74. choice=$?
    75. array=( `cat /tmp/$pid-options `)
    76. if [ -f /tmp/$pid-options ];
    77. then
    78. rm /tmp/$pid-options > /dev/null 2> /dev/null
    79. fi
    80. done
    81. fi

    As you can see, it's showing a message if the array is not completely filled. I want that window on top of the original box, so if a user selects OK, it returns to the original window, keeping the fields with their input.

    As stated before, it's not the complete code, but enough to run :). Should you need more, let me know. And indeed, the manpage on dialog is very limited...
  • Posts: 647
    edited November 2011
    Before getting into your problem, I'll make a couple of suggestions.

    Since you are using bash ((#!/bin/bash):
    1 - Use [[ (builtin) instead of [ (external test/[ command). [[ is safer,faster and has more options than test/[
    2 - Don't use `` for commands, as it is deprecated. Use $() instead (it's easier to nest commands, better readability, you can use "",etc)
    3 - Try not to insert external commands into variables ( array=( ` cat /tmp/$pid-option `) ). Better use something like:
    1. while read -r line
    2. do
    3. echo "$line"
    4. done < "$file"

    4 - "pid=$(echo $$)" ?? Why not just "pid=$$"? ( This could go in the point 3 )

    Now, to your problem:

    You have the options that the user chose in the /tmp/$pid-options file (or in the array variable) , why don't you use that info to fill the blanks on the call to the dialog? I mean, if your user, for example, just introduced the "Username" field that data can be used to fill the first spot in your dialog:
    1. "Username....:" 1 1 "${array[0]}" 1 15 14 0

    Gosshhh I love scripting :D

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