Support for internationalized shell scripts: Shell functions.

diff --git a/gettext-runtime/src/gettext.sh b/gettext-runtime/src/gettext.sh
new file mode 100644 (file)
index 0000000..1593ce8
--- /dev/null
+++ b/gettext-runtime/src/gettext.sh
@@ -0,0 +1,73 @@
+#! /bin/false
+#
+# Copyright (C) 2003 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+
+# Find a way to echo strings without interpreting backslash.
+if test "X`(echo '\t') 2>/dev/null`" = 'X\t'; then
+  echo='echo'
+else
+  if test "X`(printf '%s\n' '\t') 2>/dev/null`" = 'X\t'; then
+    echo='printf %s\n'
+  else
+    echo_func () {
+      cat <<EOT
+$*
+EOT
+    }
+    echo='echo_func'
+  fi
+fi
+
+# eval_gettext MSGID
+# looks up the translation of MSGID and substitutes shell variables in the
+# result.
+eval_gettext () {
+  gettext "$1" | (export PATH `envsubst --variables "$1"`; envsubst "$1")
+}
+
+# eval_ngettext MSGID MSGID-PLURAL COUNT
+# looks up the translation of MSGID / MSGID-PLURAL for COUNT and substitutes
+# shell variables in the result.
+eval_ngettext () {
+  ngettext "$1" "$2" "$3" | (export PATH `envsubst --variables "$1 $2"`; envsubst "$1 $2")
+}
+
+# Note: This use of envsubst is much safer than using the shell built-in 'eval'
+# would be.
+# 1) The security problem with Chinese translations that happen to use a
+#    character such as \xe0\x60 is avoided.
+# 2) The security problem with malevolent translators who put in command lists
+#    like "$(...)" or "`...`" is avoided.
+# 3) The translations can only refer to shell variables that are already
+#    mentioned in MSGID or MSGID-PLURAL.
+#
+# Note: "export PATH" above is a dummy; this is for the case when
+# `envsubst --variables ...` returns nothing.
+#
+# Note: In eval_ngettext above, "$1 $2" means a string whose variables set is
+# the union of the variables set of "$1" and "$2".
+#
+# Note: The minimal use of backquote above ensures that trailing newlines are
+# not dropped, not from the gettext invocation and not from the value of any
+# shell variable.
+#
+# Note: Field splitting on the `envsubst --variables ...` result is desired,
+# since envsubst outputs the variables, separated by newlines. Pathname
+# wildcard expansion or tilde expansion has no effect here, since the words
+# output by "envsubst --variables ..." consist solely of alphanumeric
+# characters and underscore.