Support Go language in 'etags'

* lib-src/etags.c <Ruby_help>: Fix documentation of Ruby tags.
<Go_help>: New help.
<Go_suffixes>: New variable.
(Go_functions): New function.
<lang_names>: Add entry for Go.  (Bug#22370)

* doc/emacs/maintaining.texi (Tag Syntax): Document Go support.
* doc/man/etags.1: Mention Go support.

* etc/NEWS: Mention Go support.

* test/etags/go-src/test.go:
* test/etags/go-src/test1.go: New test files.
* test/etags/Makefile (GOSRC): New variable.
(SRCS): Add $(GOSRC).
* test/etags/ETAGS.good_1:
* test/etags/ETAGS.good_2:
* test/etags/ETAGS.good_3:
* test/etags/ETAGS.good_4:
* test/etags/ETAGS.good_5:
* test/etags/ETAGS.good_6:
* test/etags/CTAGS.good: Adapt to addition of Go tests.

2 files changed, 4 insertions, 1 deletions

diff --git a/doc/emacs/maintaining.texi b/doc/emacs/maintaining.texi
index 7039de63e53..3f1a9c07e91 100644
--- a/doc/emacs/maintaining.texi
+++ b/doc/emacs/maintaining.texi
@@ -2218,6 +2218,9 @@ in the file.
 In Fortran code, functions, subroutines and block data are tags.
 
 @item
+In Go code, packages, functions, and types are tags.
+
+@item
 In HTML input files, the tags are the @code{title} and the @code{h1},
 @code{h2}, @code{h3} headers.  Also, tags are @code{name=} in anchors
 and all occurrences of @code{id=}.
diff --git a/doc/man/etags.1 b/doc/man/etags.1
index d34063f23cd..fc247f758a3 100644
--- a/doc/man/etags.1
+++ b/doc/man/etags.1
@@ -50,7 +50,7 @@ format understood by
 .BR vi ( 1 )\c
 \&.  Both forms of the program understand
 the syntax of C, Objective C, C++, Java, Fortran, Ada, Cobol, Erlang,
-Forth, HTML, LaTeX, Emacs Lisp/Common Lisp, Lua, Makefile, Pascal, Perl,
+Forth, Go, HTML, LaTeX, Emacs Lisp/Common Lisp, Lua, Makefile, Pascal, Perl,
 Ruby, PHP, PostScript, Python, Prolog, Scheme and
 most assembler\-like syntaxes.
 Both forms read the files specified on the command line, and write a tag