lib: rename `standard` as `core`

[nit.git] / lib / core / environ.nit

diff --git a/lib/core/environ.nit b/lib/core/environ.nit
new file mode 100644 (file)
index 0000000..4774878
--- /dev/null
+++ b/lib/core/environ.nit
@@ -0,0 +1,70 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2006 Floréal Morandat <morandat@lirmm.fr>
+# Copyright 2008 Jean Privat <jean@pryen.org>
+#
+# This file is free software, which comes along with NIT.  This software 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.  You can modify it is you want,  provided this header
+# is kept unaltered, and a notification of the changes is added.
+# You  are  allowed  to  redistribute it and sell it, alone or is a part of
+# another product.
+
+# Access to the environment variables of the process
+module environ
+
+import text
+import file
+
+# TODO prevoir une structure pour recup tout un environ, le modifier et le passer a process
+
+redef class String
+       # Return environment value for the symbol.
+       # If there is no such environment variable, then return ""
+       #
+       #     assert "PATH".environ     != ""
+       #     assert "NIT %\n".environ  == ""
+       fun environ: String
+       do
+               var res = self.to_cstring.get_environ
+               # FIXME: There is no proper way to handle NULL C string yet. What a pitty.
+               var nulstr = once ("".to_cstring.get_environ)
+               if res != nulstr then
+                       return res.to_s
+               else
+                       return ""
+               end
+       end
+
+       # Set the enviroment value of a variable.
+       #
+       #     "NITis".setenv("fun")
+       #     assert "NITis".environ  == "fun"
+       fun setenv(v: String) do to_cstring.setenv( v.to_cstring )
+
+       # Search for the program `self` in all directories from `PATH`
+       fun program_is_in_path: Bool
+       do
+               var full_path = "PATH".environ
+               var paths = full_path.split(":")
+               for path in paths do if path.file_exists then
+                       if path.join_path(self).file_exists then return true
+               end
+
+               return false
+       end
+end
+
+redef class NativeString
+       private fun get_environ: NativeString `{ return getenv(self); `}
+       private fun setenv(value: NativeString) `{ setenv(self, value, 1); `}
+end
+
+redef class Sys
+       redef init
+       do
+               var x = "NIT_SRAND".environ
+               if x != "" then srand_from(x.to_i)
+       end
+end