adding exec feature

reporting/markslider

@@ -14,6 +14,37 @@ function display_self {
     exit 1
 }
 
+function display_slide {
+    j=$(( $2 + 1 ))
+    echo -en "$CLS"
+    awk 'match($0,/^# /){
+            c++; 
+            print c $0;
+     }
+     !/^# /{
+            print $0;
+     }
+' "$1" | sed -n '/^'$2'# /,/^'$j'# /p' | grep -v "^$j# " | sed 's,^'$i'\(# .*\),'$H'\1'$Z',' | eval sed $REGEX 
+}
+function slide_exec {
+    # find executables in the slide
+    j=$(( $2 + 1 ))
+    echo -en "$CLS"
+    while read line
+    do eval $line > /dev/null 2>&1 & 
+    done < <( 
+        awk 'match($0,/^# /){
+            c++; 
+            print c $0;
+     }
+     !/^# /{
+            print $0;
+     }
+' "$1" | sed -n '/^'$2'# /,/^'$j'# /p' | grep "^\$( " | sed -e 's,^\$( ,,' -e 's,)$,,' )
+
+}
+
+
 E='\x1b['
 H="${E}1m"
 Z="${E}0m"
@@ -44,6 +75,7 @@ for (( r=0; r<${#CONF_LINE[@]}; r++ ));
         replace=$( eval echo ${!value} )
     REGEX="$REGEX -e 's/\(${CONF_LINE[$r]}\)/"${replace}"/g'"
  done
+REGEX="$REGEX -e 's/^\$([^\$]\+)/\$(*)/g'"
 #echo $REGEX
 #exit
 
@@ -54,38 +86,31 @@ do
     # print slide $i
     NO_SLIDES=$( grep -ce "^# " "$1" )
     COLS=$(( $( tput cols ) - 3 ))
-    j=$(( $i + 1 ))
-    echo -en "$CLS"
-    awk 'match($0,/^# /){
-            c++; 
-            print c $0;
-     }
-     !/^# /{
-            print $0;
-     }
-' "$1" | sed -n '/^'$i'# /,/^'$j'# /p' | grep -v "^$j# " | sed 's,^'$i'\(# .*\),'$H'\1'$Z',' | eval sed $REGEX 
+    display_slide "$1" $i 
     # ask for user input
-    #  1 back,  2 forward, q exit, h help
+    #  1 back,  2 forward, q exit, m menu
     echo -ne "${Z}${E}1;${COLS}H"
     [ -z "$MENU" ] || {
         echo -ne "${i}/${NO_SLIDES}"
         echo -ne "${E}1B${E}3D1:▶"
         echo -ne "${E}1B${E}3D2:◀"
         echo -ne "${E}1B${E}3Dq:x"
-        echo -ne "${E}1B${E}3Dh:▲${E}4A"
+        echo -ne "${E}1B${E}3Dm:▲${E}4A"
     }
-    read -s -N 1  cmd
+    read -s -N 1 cmd
+    # Escape inputed if arrow keys used
+    [ "$cmd" = "" ] && read -s -N 2 cmd
     
     case "$cmd" in
-        2)
+        2|"[D")
             i=$(( $i - 1 ))
             [ $i -lt 1 ] && i=1
         ;;
-        1)
+        1|"[C"|"")
             i=$(( $i + 1 ))
             [ $i -gt $NO_SLIDES ] && i=$NO_SLIDES
         ;;
-        h)
+        m)
             [ -z "$MENU" ] && {
                 MENU=1
             } || {
@@ -96,6 +121,9 @@ do
             echo -ne "${E}1E"
             exit
         ;;
+        e)
+            slide_exec "$1" $i
+        ;;
         esac
     done
 
@@ -116,7 +144,7 @@ exit
 * Move to the next slide with key 1
 * Move to the previous slide with key 2
 * Exit with q or x
-* Hide menu with h
+* Hide menu with m
 * The numbers on the right show the current
   and number of slides in this presentation
 
@@ -165,7 +193,6 @@ Object  Area  Perimeter
   Background colors: BGR BGG BGB BGC BGM BGY BGW
   Reset colors with ${ Z}
 
-
 # Hints: Presenting
 
 * Use a terminal with large font, perhaps 80 columns on screen
@@ -173,6 +200,9 @@ Object  Area  Perimeter
                     ┌──────┐ 
 * Get creative with │Ascii!│ 
                     └┬────┬┘ 
+* Run any command with pressing "e" on a slide with
+  syntax beginning a row: "$ ( command )"
+$( xeyes )
 
 # Hints: Other tools