gui

   1 #!/bin/bash
   2 # Copyright (C) 2006 Andre Noll
   3 # Licensed under the LGPL, version 3. See COPYING and COPYING.LESSER.
   4
   5 if [[ "$(type -t _gsu_setup)" != "function" ]]; then
   6         gsu_dir=${gsu_dir:-${BASH_SOURCE[0]%/*}}
   7         . "$gsu_dir/common" || exit 1
   8         _gsu_setup
   9 fi
  10
  11 _gsu_node_name_pattern='[a-zA-Z_]'
  12
  13 _get_geometry()
  14 {
  15         local x y
  16         result="$(stty size)"
  17         if (($? != 0)); then
  18                 gsu_msg "fatal: could not get terminal geometry"
  19                 exit 1
  20         fi
  21         x="${result#* }"
  22         y="${result%% *}"
  23         ((x > 190)) && x=190
  24         result="$y $x"
  25 }
  26
  27 _set_dialog_ret()
  28 {
  29         local ec="$1"
  30
  31         case "$ec" in
  32         0) ret=$GSU_SUCCESS;;
  33         1) ret=1;; # cancelled
  34         *)
  35                 result="dialog exit code $ec"
  36                 ret=-$E_GSU_DIALOG
  37         esac
  38 }
  39
  40 # Open a dialog box which asks the user to input a text
  41 #
  42 # Usage: gsu_input_box <text> <init>
  43 #
  44 # <text> is displayed above of the input field, which is is preset to <init>.
  45 # The entered text is returned in $result. On success (user pressed OK)
  46 # the function returns zero. If the user selected Cancel, the return value is
  47 # one. On dialog errors, a negative error code is returned.
  48 gsu_inputbox()
  49 {
  50         local g text="$1" init="$2"
  51
  52         _get_geometry
  53         g="$result"
  54         result="$(dialog --inputbox "$text" $g "$init" 3>&1 1>&2 2>&3 3>&-)"
  55         _set_dialog_ret $?
  56 }
  57
  58 # Show the given file in a text box
  59 #
  60 # Usage: gsu_textbox <path>
  61 #
  62 # The box has an OK button which closes the box when activated.
  63 gsu_textbox()
  64 {
  65         local g file="$1"
  66
  67         _get_geometry
  68         g="$result"
  69
  70         ret=-$E_GSU_DIALOG
  71         result='textbox'
  72         dialog --textbox "$file" $g
  73         _set_dialog_ret $?
  74 }
  75
  76 # Show a message in a text box
  77 #
  78 # Usage: gsu_msgbox <text>
  79 #
  80 # This is like gsu_textbox() but the text is passed as a string.
  81 gsu_msgbox()
  82 {
  83         local tmp
  84
  85         # Some versions of dialog segfault if the text is too long. Hence we
  86         # always use a temporary file.
  87         gsu_make_tempfile 'gsu_msgbox.XXXXXXXXXX'
  88         ((ret < 0)) && return
  89         tmp="$result"
  90         trap "rm -f $tmp" EXIT
  91         echo "$1" > "$tmp"
  92         gsu_textbox "$tmp"
  93         rm -f "$tmp" # ignore errors
  94 }
  95
  96 _gsu_menu()
  97 {
  98         local header="${1:-root}"
  99         local items="$2"
 100         local i opts num=0
 101
 102         _get_geometry
 103         opts="$result 16"
 104         for i in $items; do
 105                 let num++
 106                 opts+=" $i $num"
 107         done
 108         result="$(dialog --menu "$gsu_banner_txt ($header)" $opts 3>&1 1>&2 2>&3 3>&-)"
 109         _set_dialog_ret $?
 110 }
 111
 112 _get_level()
 113 {
 114         local tmp="${1%%$_gsu_node_name_pattern*}"
 115         result="${#tmp}"
 116 }
 117
 118 _get_subtree()
 119 {
 120         local tree="$1" root="${2%/}"
 121         local first TAB='       '
 122
 123         ret=-$E_GSU_MENU_TREE
 124         result="subtree grep failed"
 125         first="$(grep -n "$TAB\{1,\}$root/" <<< "$tree")" || return
 126         [[ -z "$first" ]] && return
 127
 128         line_num="${first%%:*}"
 129         _get_level "${first#*:}"
 130         level="$result"
 131
 132         #echo "line: $line_num, root: $root, indent level: $level"
 133         result="$(sed -e "1,${line_num}d;" <<< "$tree" \
 134                 | sed -e "/^$TAB\{1,$level\}$_gsu_node_name_pattern/,\$d" \
 135                 | sed -e "/^$TAB\{$((level + 2))\}/d")"
 136         if (($? != 0)); then
 137                 ret=-$E_GSU_MENU_TREE
 138                 result="sed command for subtree $root failed"
 139                 return
 140         fi
 141         ret=$GSU_SUCCESS
 142 }
 143
 144 _get_root_nodes()
 145 {
 146         local tree="$1" TAB='   '
 147
 148         result="$(grep "^${TAB}${_gsu_node_name_pattern}" <<< "$tree")"
 149         if (($? != 0)); then
 150                 ret=-$E_GSU_MENU_TREE
 151                 result="root node grep failed"
 152                 return
 153         fi
 154         ret=$GSU_SUCCESS
 155 }
 156
 157 _browse()
 158 {
 159         local header="$1" old_header
 160         local tree="$2" subtree="$3"
 161
 162         while :; do
 163                 _gsu_menu "$header" "$subtree"
 164                 ((ret < 0)) && return
 165                 [[ -z "$result" ]] && return # menu was cancelled
 166                 if [[ "${result%/}" != "$result" ]]; then
 167                         old_header="$header"
 168                         header="$result"
 169                         _get_subtree "$tree" "$header"
 170                         ((ret < 0)) && return
 171                         _browse "$header" "$tree" "$result"
 172                         ((ret < 0)) && return
 173                         header="$old_header"
 174                         continue
 175                 fi
 176                 eval ${gsu_name}_$result
 177         done
 178 }
 179
 180 gsu_gui()
 181 {
 182         local tree="$1" subtree
 183
 184         type -t dialog &> /dev/null
 185         if (($? != 0)); then
 186                 gsu_msg "dialog executable not found"
 187                 exit 1
 188         fi
 189         _get_root_nodes "$tree"
 190         subtree="$result"
 191         _browse "main menu" "$tree" "$subtree"
 192 }