Don't enforce debuging and verbosity modes on import

Also don't rely on running the value; ie. sec risk.

src/include-bash/pretty.sh

@@ -5,7 +5,7 @@ shellfu import exit
 #
 # Application debug mode
 #
-PRETTY_DEBUG=${PRETTY_DEBUG:-false}
+PRETTY_DEBUG=${PRETTY_DEBUG:-}
 
 #
 # List of module/function names to exclude from debuging
@@ -24,7 +24,7 @@ PRETTY_DEBUG_EXCLUDE=${PRETTY_DEBUG_EXCLUDE:-}
 #
 # Application verbosity mode
 #
-PRETTY_VERBOSE=${PRETTY_VERBOSE:-false}
+PRETTY_VERBOSE=${PRETTY_VERBOSE:-}
 
 #
 # Name of pretty-printer module
@@ -76,7 +76,7 @@ debug() {
     #     debug "var1=$var1" "var2=$var2" "result=$result"
     #     debug -v var1 var2 result
     #
-    $PRETTY_DEBUG || return 0
+    test "$PRETTY_DEBUG" == true || return 0
     _pretty__echo "$@"
 }
 
@@ -214,7 +214,7 @@ think() {
     # Use "-l" to split every parameter to separate line, (useful
     # or longer warnings)
     #
-    $PRETTY_VERBOSE || return 0
+    test "$PRETTY_VERBOSE" == true || return 0
     _pretty__echo "$@"
 }
 
@@ -428,7 +428,7 @@ _pretty__echo_trace() {
     #
     # Print "decorated" call trace (only in debug mode)
     #
-    $PRETTY_DEBUG || return 0
+    test "$PRETTY_DEBUG" == true || return 0
     local depth
     echo "== trace =="
     for depth in $(seq 0 ${#FUNCNAME}); do