FIX: todo_completion problem with Bash 3.1

Regexp matching changed from 3.1 to 3.2. Make it work for Bash 3.1 by using an intermediate variable, as in 394c4c748a.
Cp. http://tech.groups.yahoo.com/group/todotxt/message/4211

tests/t1310-listcon.sh

@@ -55,16 +55,6 @@ test_todo_session 'listcon e-mail address test' <<EOF
 @con02
 EOF
 
-cat > todo.txt <<EOF
-(B) smell the uppercase Roses +roses @outside +shared
-(C) notice the sunflowers +sunflowers @garden +shared +landscape
-stop
-EOF
-test_todo_session 'listcon with project' <<EOF
->>> todo.sh listcon +landscape
-@garden
-EOF
-
 cat > todo.txt <<EOF
 @con01 -- Some context 1 task
 EOF

todo.sh

@@ -58,7 +58,7 @@ shorthelp()
 		    list|ls [TERM...]
 		    listall|lsa [TERM...]
 		    listaddons
-		    listcon|lsc [TERM...]
+		    listcon|lsc
 		    listfile|lf [SRC [TERM...]]
 		    listpri|lsp [PRIORITIES] [TERM...]
 		    listproj|lsprj [TERM...]
@@ -223,10 +223,9 @@ help()
 		    listaddons
 		      Lists all added and overridden actions in the actions directory.
 
-		    listcon [TERM...]
-		    lsc [TERM...]
+		    listcon
+		    lsc
 		      Lists all the task contexts that start with the @ sign in todo.txt.
-		      If TERM specified, considers only tasks that contain TERM(s).
 
 		    listfile [SRC [TERM...]]
 		    lf [SRC [TERM...]]
@@ -246,11 +245,10 @@ help()
 		      Hides all tasks that contain TERM(s) preceded by a minus sign
 		      (i.e. -TERM).  
 
-		    listproj [TERM...]
-		    lsprj [TERM...]
+		    listproj
+		    lsprj
 		      Lists all the projects (terms that start with a + sign) in
 		      todo.txt.
-		      If TERM specified, considers only tasks that contain TERM(s).
 
 		    move ITEM# DEST [SRC]
 		    mv ITEM# DEST [SRC]
@@ -860,17 +858,7 @@ _format()
     fi
 }
 
-listWordsWithSigil()
-{
-    sigil=$1
-    shift
-
-    FILE=$TODO_FILE
-    [ "$TODOTXT_SOURCEVAR" ] && eval "FILE=$TODOTXT_SOURCEVAR"
-    eval "$(filtercommand 'cat "${FILE[@]}"' '' "$@")" | grep -o "[^ ]*${sigil}[^ ]\\+" | grep "^$sigil" | sort -u
-}
-
-export -f cleaninput getPrefix getTodo getNewtodo shellquote filtercommand _list listWordsWithSigil getPadding _format die
+export -f cleaninput getPrefix getTodo getNewtodo shellquote filtercommand _list getPadding _format die
 
 # == HANDLE ACTION ==
 action=$( printf "%s\n" "$ACTION" | tr 'A-Z' 'a-z' )
@@ -1145,13 +1133,16 @@ case $action in
     ;;
 
 "listcon" | "lsc" )
-    shift
-    listWordsWithSigil '@' "$@"
+    FILE=$TODO_FILE
+    [ "$TODOTXT_SOURCEVAR" ] && eval "FILE=$TODOTXT_SOURCEVAR"
+    grep -ho '[^ ]*@[^ ]\+' "${FILE[@]}" | grep '^@' | sort -u
     ;;
 
 "listproj" | "lsprj" )
+    FILE=$TODO_FILE
+    [ "$TODOTXT_SOURCEVAR" ] && eval "FILE=$TODOTXT_SOURCEVAR"
     shift
-    listWordsWithSigil '+' "$@"
+    eval "$(filtercommand 'cat "${FILE[@]}"' '' "$@")" | grep -o '[^ ]*+[^ ]\+' | grep '^+' | sort -u
     ;;
 
 "listpri" | "lsp" )

todo_completion

@@ -14,14 +14,15 @@ _todo()
         rm depri dp do help list ls listaddons listall lsa listcon  \
         lsc listfile lf listpri lsp listproj lsprj move \
         mv prepend prep pri p replace report shorthelp"
+    local -r MOVE_COMMAND_PATTERN='^(move|mv)$'
 
     local _todo_sh=${_todo_sh:-todo.sh}
     local completions
     if [ $COMP_CWORD -eq 1 ]; then
         completions="$COMMANDS $(eval TODOTXT_VERBOSE=0 $_todo_sh command listaddons) $OPTS"
     elif [[ $COMP_CWORD -gt 2 && ( \
-        "${COMP_WORDS[COMP_CWORD-2]}" =~ ^(move|mv)$ || \
-        "${COMP_WORDS[COMP_CWORD-3]}" =~ ^(move|mv)$ ) ]]; then
+        "${COMP_WORDS[COMP_CWORD-2]}" =~ $MOVE_COMMAND_PATTERN || \
+        "${COMP_WORDS[COMP_CWORD-3]}" =~ $MOVE_COMMAND_PATTERN ) ]]; then
         # "move ITEM# DEST [SRC]" has file arguments on positions 2 and 3.
         completions=$(eval TODOTXT_VERBOSE=0 $_todo_sh command listfile)
     else