epm-sh-functions: add sed_escape

bin/epm-sh-functions

@@ -265,6 +265,16 @@ strip_spaces()
         echo "$*" | filter_strip_spaces
 }
 
+
+# https://superuser.com/questions/422459/substitution-in-text-file-without-regular-expressions
+# http://stackoverflow.com/a/2705678/120999
+# use for subst complex string with symbols treating as regexp
+sed_escape()
+{
+	echo "$*" | sed -e 's/[]()$*.^|[]/\\&/g'
+}
+
+
 # param true false
 subst_option()
 {
@@ -799,6 +809,11 @@ realpath()
 }
 fi
 
+# TODO: use perl if sed -i is not accessible
+# sed -i is only supported in GNU sed.
+#  sed -i "s/$find/$replace/g" "$@"
+#  perl -p -i -e "s/$find/$replace/g" "$@"
+
 # add subst if missed
 if ! which subst 2>/dev/null >/dev/null ; then
 subst()

tests/test_sed_escaping.sh

+#!/bin/sh
+
+load_helper()
+{
+    . ../bin/$1
+}
+
+PMTYPE=apt-rpm
+
+. ../bin/epm-sh-functions
+
+test()
+{
+    [ "$(sed_escape "$1")" = "$2" ] && echo "OK: $1 -> $2" || echo "FAILED: $1 -> $(sed_escape "$1"), waited $2"
+}
+
+test "rpm [lab50] http://packages.lab50.net okular/alt/x86_64 p10" "rpm \[lab50\] http://packages\.lab50\.net okular/alt/x86_64 p10"