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|
#/bin/bash
# Variables
# """""""""
PROG=${0#*/}
typeset -a MENU_STACK # A stack of MENUS to store the previously visited menus
# Array of menu characteristics for caching purpose
# '''''''''''''''''''''''''''''''''''''''''''''''''
typeset -A MENU_ARRAY
typeset -A COL_ARRAY
typeset -A CENTERING_ARRAY
typeset -A TITLE_ARRAY
typeset -A ERASE_ARRAY
SEL= # The selection
# ============================ #
# Usage function, always fails #
# ============================ #
function usage
{
echo "Usage: $PROG menu_file[.mnu] user_program," >&2
echo " read the README for an example" >&2
exit 1
}
# ==================== #
# Fatal error function #
# ==================== #
function error
{
echo $* >&2
exit 1
}
# The script expects exactly one argument (the filename of the root menu).
# """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
(( $# != 2 )) && usage
USER_PROGRAM=$2
# ======================================================================= #
# Parse a level in the menu hierarchy and call process with the selection #
# (possibly empty). #
# ======================================================================= #
function process_menu
{
TITLE="[ENTER: select, q: abort]"$'\n' # Untitled by default
CENTERING= # Is the menu centered in the screen ?
ERASE= # Destroy the selection window after use
MENU_FILE=$1
MENU= # Make sure the working area is empty
# If the menu has already been seen, read its characteristics from the cache
# else construct them.
# """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
if [[ -z ${MENU_ARRAY[$MENU_FILE]} ]]; then
COL=1
# Parse the directives embedded in the menu file
# """"""""""""""""""""""""""""""""""""""""""""""
MENU_DIRECIVES=$(grep '^\.' $MENU_FILE)
while read DIRECTIVE VALUE; do
case $DIRECTIVE in
.columns) # Number of columns of the menu
COL=$VALUE
(( COL < 1 || COL > 15 )) && error "$DIRECTIVE, bad value"
;;
.centered) # Is the menu centered?
[[ $VALUE == yes ]] && CENTERING="-M"
;;
.eraseafter) # Will the space used by the menu be reclaimed?
[[ $VALUE == yes ]] && ERASE="-d"
;;
.title) # The menu title
TITLE="$VALUE"$'\n'$TITLE
;;
*)
error "bad directive $DIRECTIVE"
;;
esac
done <<< "$MENU_DIRECIVES"
# Build the menu entries in the working area
# """"""""""""""""""""""""""""""""""""""""""
MENU_LINES=$(grep -v -e '^\.' -e '^#' -e '^[ \t]*$' $MENU_FILE)
# The special tag "---" creates an empty entry (a hole in a column)
# The special tag "===" create an empty line
# The special tag "EXIT" permit to exit the menu
# '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
while read TAG VALUE; do
ITEMS_TO_ADD=1 # By default, only one iteration of the tag is taken
# into account
(( ${#TAG} > 10 )) && error "Menu tag too long (max 10 characters)."
[[ $TAG == --- ]] && VALUE=@@@
[[ $TAG == === ]] && VALUE=@@@ && ITEMS_TO_ADD=COL
[[ -z $VALUE ]] && error "Empty menu entry for $TAG"
[[ $TAG == EXIT ]] && TAG="@EXIT@xxxx00"
[[ $TAG == "<"* ]] && TAG="<xxxxxxxxx00"
# Protect quotes in VALUE
# """""""""""""""""""""""
FINAL_VALUE=$(echo "$VALUE" | sed -e 's/"/\\"/' -e "s/'/\\\\'/")
while (( ITEMS_TO_ADD-- > 0 )); do
MENU+="'$TAG $FINAL_VALUE'"$'\n'
done
done <<< "$MENU_LINES"
# Feed the cache
# """"""""""""""
MENU_ARRAY[$MENU_FILE]="$MENU"
COL_ARRAY[$MENU_FILE]=$COL
CENTERING_ARRAY[$MENU_FILE]=$CENTERING
TITLE_ARRAY[$MENU_FILE]=$TITLE
ERASE_ARRAY[$MENU_FILE]=$ERASE
else
# Read from the cache
# """""""""""""""""""
MENU="${MENU_ARRAY[$MENU_FILE]}"
COL=${COL_ARRAY[$MENU_FILE]}
CENTERING=${CENTERING_ARRAY[$MENU_FILE]}
TITLE=${TITLE_ARRAY[$MENU_FILE]}
ERASE=${ERASE_ARRAY[$MENU_FILE]}
fi
# Display the menu and get the selection
# """"""""""""""""""""""""""""""""""""""
SEL=$(echo "$MENU" | ../../smenu \
$CENTERING \
$ERASE \
-N \
-F -D o:10 i:0 n:2 \
-n \
-m "$TITLE" \
-t $COL \
-S'/@@@/ /' \
-S'/^[^ ]+ //v' \
-e @@@)
SEL=${SEL%% *}
}
# Check for the presence of ../../smenu
# """""""""""""""""""""""""""""""""""""
[[ -x ../../smenu ]] || error "smenu is not there, please build it."
# Initialize the menu stack with the argument
# """""""""""""""""""""""""""""""""""""""""""
MENU_STACK+=(${1%.mnu}.mnu)
# And process the main menu
# """""""""""""""""""""""""
process_menu ${1%.mnu}.mnu
# According to the selection, navigate in the submenus or return
# the tag associated with the selected menu entry.
# """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
while true; do
if [[ $SEL == "<"* ]]; then
# Back to the previous menu
# '''''''''''''''''''''''''
if (( ${#MENU_STACK[*]} == 1 )); then
process_menu ${MENU_STACK[-1]}
else
# Unstack the newly found submenu
# '''''''''''''''''''''''''''''''
unset MENU_STACK[-1]
# And generate the previous menu
# ''''''''''''''''''''''''''''''
process_menu ${MENU_STACK[-1]}
fi
elif [[ $SEL == ">"* ]]; then
# Enter the selected submenu
# ''''''''''''''''''''''''''
SMENU_FILE=${SEL#>}
SMENU_FILE=${SMENU_FILE%.mnu}.mnu
[[ -f $SMENU_FILE ]] || error "The file $SMENU_FILE was not found/readable."
# Stack the newly found submenu
# '''''''''''''''''''''''''''''
MENU_STACK+=($SMENU_FILE)
# And generate the submenu
# ''''''''''''''''''''''''
process_menu $SMENU_FILE
else
# An empty selection means than q or ^C has been hit
# ''''''''''''''''''''''''''''''''''''''''''''''''''
[[ -z $SEL ]] && exit 0
# Output the selected menu tag or exit the menu without outputting
# anything.
# ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
[[ $SEL == @EXIT@* ]] && exit 0
# Lauch the user action which has the responsibility to act according
# to the tag passed as argument.
# '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
$USER_PROGRAM $SEL
# And re-generate the current menu
# ''''''''''''''''''''''''''''''''
process_menu ${MENU_STACK[-1]}
fi
done
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