Add functions to find and dereference plugin variables

src/include-bash/sfpi.sh

     shellfu import "$mod"
 }
 
+sfpi__varname() {
+    #
+    # Print name of plugin $1 variable $2
+    #
+    # Note that the variables are assumed to be named in ALL_CAPS,
+    # so prefix is converted accordingly (not the variable name,
+    # though).
+    #
+    # Example:
+    #
+    #     SFPI__PREFIX=foo
+    #     sfpi__varname bar BAZ     # prints 'FOO_BAR__BAZ'
+    #
+    __sfpi__ckpfx
+    local plg=$1
+    local var=$2
+    echo "${SFPI__PREFIX^^}_${plg^^}__$var"
+}
+
+sfpi__varvalue() {
+    #
+    # Print value of plugin $1 variable $2
+    #
+    # Note that the variables are assumed to be named in ALL_CAPS,
+    # so prefix is converted accordingly (not the variable name,
+    # though).
+    #
+    # Example:
+    #
+    #     SFPI__PREFIX=foo
+    #     sfpi__varvalue bar BAZ    # prints value of $FOO_BAR__BAZ
+    #
+    __sfpi__ckpfx
+    local plg=$1
+    local var=$2
+    local varname="${SFPI__PREFIX^^}_${plg^^}__$var"
+    echo "${!varname}"
+}
+
 sfpi__funname() {
     #
     # Print name of plugin $1 function $2

tests/shellfu_api/oracle/functions.stdout

 sfpi:sfpi__ls
 sfpi:sfpi__ls_all
 sfpi:sfpi__modname
+sfpi:sfpi__varname
+sfpi:sfpi__varvalue