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#!/usr/bin/env bash
# This is a tiny shell utility for string manipulation.
# Allow us to use "local"
# shellcheck disable=SC3043
set -eu
_HELP='Usage:
str {lower,upper}
str test
Commands:
lower, upper
Convert input (stdin) to all-lowercase or all-uppercase, respectively
test <str1> (-ieq|-ine|-contains|-matches) <str2>
Like "test", but with additional string comparisons:
-ieq • case-insensitive equal
-ine • case-insensitive not-equal
-contains • Check if <str1> contains <str2>
-matches • Check if <str1> matches pattern <str2> (A grep -E pattern)
'
fail() {
# shellcheck disable=SC2059
printf -- "$@" 1>&2
printf -- "\n" 1>&2
return 1
}
__str__upper() {
__justStdin upper __upper "$@"
}
__upper() {
tr '[:lower:]' '[:upper:]'
}
__str__lower() {
__justStdin lower __lower "$@"
}
__lower() {
tr '[:upper:]' '[:lower:]'
}
__justStdin() {
if test $# -gt 2; then
fail "Command '%s' does not take any arguments (write input into stdin)" "$1" || return
fi
"$2"
}
__str__help() {
printf %s "$_HELP"
}
__str____help() {
__str help
}
__str___h() {
__str help
}
__str___help() {
__str help
}
__str__test() {
test "$#" -eq 3 || fail '“str test” expects three arguments (Got %d: “%s”)' $# "$*" \
|| return
local lhs="$1"
local op="$2"
local rhs="$3"
local norm_lhs norm_rhs;
norm_lhs=$(echo "$lhs" | __str lower) || return
norm_rhs=$(echo "$rhs" | __str lower) || return
case $op in
-ieq)
test "$norm_lhs" = "$norm_rhs";;
-ine)
test "$norm_lhs" != "$norm_rhs";;
-matches)
printf %s "$lhs" | grep -qE -- "$rhs";;
-contains)
printf %s "$lhs" | grep -qF -- "$rhs";;
-*|=*)
# Just defer to the underlying test command
test "$lhs" "$op" "$rhs"
esac
}
__str() {
local _Command="$1"
local _CommandIdent
_CommandIdent="$(echo "__str__$_Command" | sed '
s/-/_/g
s/\./__/g
')"
shift
"$_CommandIdent" "$@"
}
__str "$@"
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