[Bootstrap]: Create an index of errors and their descriptions

bootstrap/pkg/errors/errors.go

@@ -0,0 +1,54 @@
+/*
+ Serene --- Yet an other Lisp
+
+Copyright (c) 2020  Sameer Rahmani <lxsameer@gnu.org>
+
+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 of the License.
+
+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, see <http://www.gnu.org/licenses/>.
+*/
+
+// Package errors is dedicated to hold the error numbers and description of
+// each knowen error in Serene
+package errors
+
+type Errno uint
+
+const (
+	E0000 Errno = iota // THE DESCRIPTION IS NOT SET
+	E0001
+	E0002
+)
+
+var ErrorsDescription map[Errno]string = map[Errno]string{
+	E0000: `Can't find any description for this error.`,
+	E0001: `
+Namespaces are fundamental units in Serene. Each file has to start with
+a namespace declaration with a name that matches the path of the file.
+
+For example imagine haivng a file with the following path
+'/home/user/xyz/src/example/abc.srn' and '/home/user/xyz/src' is
+in the load path. The namespace path to the file would be 'example.abc' so
+that file has to contain a 'ns' form as the first expression with
+'example.abc' as the name just like:
+
+(ns example.abc)
+...rest of the file...
+
+Since comments are not expressions it's ok to start a file by comments
+followed by the 'ns' form`,
+
+	E0002: `
+Functions expect a certain number of argument. The number of arguments
+that you're passing to the function doesn't match with it's signature.
+To fix the problem double check the function signature and make sure
+that you're passing the correct number of arguments to it`,
+}