names.tex: Specify eclass names

Eclasses may export phase functions prefixed with their name, so
ideally we would follow the syntax of Bash (and POSIX) identifiers:

| A word consisting solely of underscores, digits, and alphabetics
| from the portable character set. The first character of a name is
| not a digit.

Because many existing eclasses have a dot or a hyphen in their name,
we follow usage in the Gentoo repository instead. (The only historical
exception to the above was 64-bit.eclass, not used since 2006 and
removed in 2009.)

An eclass must not be named "default", otherwise names of exported
functions would collide with default_<phase-function>.

Signed-off-by: Ulrich Müller <ulm@gentoo.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/eclasses.tex b/eclasses.tex
index 01692bc..0b9b5d4 100644
--- a/eclasses.tex
+++ b/eclasses.tex
@@ -10,6 +10,7 @@ hold.
 Eclasses must be located in the \t{eclass} directory in the top level of the repository---see
 section~\ref{sec:eclass-dir}. Each eclass is a single file named \t{<name>.eclass}, where \t{<name>}
 is the name of this eclass, used by \t{inherit} and \t{EXPORT_FUNCTIONS} among other places.
+\t{<name>} must be a valid eclass name, as per section~\ref{sec:eclass-names}.
 
 \section{The inherit Command}
 \label{sec:inherit}
diff --git a/names.tex b/names.tex
index 2994719..76fa72d 100644
--- a/names.tex
+++ b/names.tex
@@ -18,6 +18,11 @@ syntax described in section~\ref{sec:version-spec}.
 \note{A package name does not include the category. The term \i{qualified package name} is used
 where a \t{category/package} pair is meant.}
 
+\subsection{Eclass names}
+\label{sec:eclass-names}
+An eclass name may contain any of the characters [\t{A-Za-z0-9_.-}]. It must begin with a letter or
+an underscore. In addition, an eclass cannot be named \t{default}.
+
 \subsection{Slot names}
 \label{sec:slot-names}
 A slot name may contain any of the characters [\t{A-Za-z0-9+_.-}]. It must not begin with a