当前目录：
[mirror@home libevent]$ ls
arc4random.c bufferevent_sock.c epoll.c event_tagging.c evutil.c l Makefile.am strlcpy-internal.h
autogen.sh buffer_iocp.c epoll_sub.c evmap.c evutil_rand.c libevent_openssl.pc.in Makefile.nmake test
b changelist-internal.h evbuffer-internal.h evmap-internal.h evutil_time.c libevent.pc.in minheap-internal.h time-internal.h
buffer.c ChangeLog evconfig-private.h.in evport.c ht-internal.h libevent_pthreads.pc.in mm-internal.h util-internal.h
bufferevent_async.c ChangeLog-1.4 evdns.3 evrpc.c http.c LICENSE poll.c whatsnew-2.0.txt
bufferevent.c ChangeLog-2.0 evdns.c evrpc-internal.h http-internal.h listener.c ratelim-internal.h whatsnew-2.1.txt
bufferevent_filter.c compat event.3 evsignal-internal.h include log.c README WIN32-Code
bufferevent-internal.h configure.in event.c evthread.c iocp-internal.h log-internal.h sample win32select.c
bufferevent_openssl.c defer-internal.h event-internal.h evthread-internal.h ipv6-internal.h m4 select.c
bufferevent_pair.c devpoll.c event_iocp.c evthread_pthread.c kqueue.c make_epoll_table.py signal.c
bufferevent_ratelim.c Doxyfile event_rpcgen.py evthread_win32.c kqueue-internal.h make-event-config.sed strlcpy.c
测试目录中有一些文件：
[mirror@home libevent]$ ls test/
bench.c Makefile.am regress_dns.c regress_listener.c regress_ssl.c regress_zlib.c test-fdleak.c test-time.c tinytest_local.h
bench_cascade.c Makefile.nmake regress_et.c regress_main.c regress_testutils.c rpcgen_wrapper.sh test-init.c test-weof.c tinytest_macros.h
bench_http.c regress_buffer.c regress.h regress_minheap.c regress_testutils.h test-changelist.c test-ratelim.c tinytest.c
bench_httpclient.c regress_bufferevent.c regress_http.c regress.rpc regress_thread.c test-dumpevents.c test-ratelim.sh tinytest_demo.c
check-dumpevents.py regress.c regress_iocp.c regress_rpc.c regress_util.c test-eof.c test.sh
测试目录中有很多具有 main() 函数的文件：
[mirror@home libevent]$ find test/ -regex .*.c -exec grep main {} +
test/regress.c:struct testcase_t main_testcases[] = {
test/test-weof.c:main(int argc, char **argv)
test/regress_dns.c:/* FIXME: We should move this to regress_main.c if anything else needs it.*/
test/regress_buffer.c: size_t remaining;
test/regress_buffer.c: remaining = v[0].iov_len - 512;
test/regress_buffer.c: tt_int_op(remaining, ==, v[0].iov_len);
test/regress_buffer.c: remaining -= 8;
test/regress_buffer.c: n = evbuffer_reserve_space(buf, remaining+64, v, 2);
test/regress_buffer.c: tt_int_op(remaining, ==, v[0].iov_len);
test/regress_buffer.c: remaining -= 1;
test/regress_buffer.c: n = evbuffer_reserve_space(buf, remaining+64, v, 2);
test/regress_buffer.c: tt_int_op(remaining, ==, v[0].iov_len);
test/regress_buffer.c: /* Drain some of the remaining chunk, then add it to another buffer */
test/regress_main.c: { "main/", main_testcases },
test/regress_main.c:main(int argc, const char **argv)
test/regress_main.c: if (tinytest_main(argc,argv,testgroups))
test/tinytest.c:static int in_tinytest_main = 0; /**< true if we're in tinytest_main().*/
test/tinytest.c: if (!in_tinytest_main) {
test/tinytest.c: " called from within tinytest_main.\n");
test/tinytest.c:tinytest_main(int c, const char **v, struct testgroup_t *groups)
test/tinytest.c: ++in_tinytest_main;
test/tinytest.c: --in_tinytest_main;
test/test-eof.c:main(int argc, char **argv)
test/test-ratelim.c:main(int argc, char **argv)
test/tinytest_demo.c:main(int c, const char **v)
test/tinytest_demo.c: /* Finally, just call tinytest_main(). It lets you specify verbose
test/tinytest_demo.c: return tinytest_main(c, v, groups);
test/test-time.c:main(int argc, char **argv)
test/bench_cascade.c:main(int argc, char **argv)
test/test-dumpevents.c: remain in the future.
test/test-dumpevents.c:main(int argc, char **argv)
test/test-changelist.c:main(int argc, char **argv)
test/test-init.c:main(int argc, char **argv)
test/test-fdleak.c:main(int argc, char **argv)
test/bench_http.c:main(int argc, char **argv)
test/bench.c:main(int argc, char **argv)
test/bench_httpclient.c:main(int argc, char **argv)
但在我使用之后：
ctags -R .
打开vim，然后
:tag main
:g ]
状态栏只显示：
E433: No tags file
E426: tag not found: main
怎么了？标签文件已经加载，为什么没有标签文件？这令人困惑……
似乎由 ctags 生成的索引包含这些文件，其中包括主要功能：
3643 main sample/dns-example.c /^main(int c, char **v) {$/;" f
3644 main sample/event-read-fifo.c /^main(int argc, char **argv)$/;" f
3645 main sample/hello-world.c /^main(int argc, char **argv)$/;" f
3646 main sample/http-server.c /^main(int argc, char **argv)$/;" f
3647 main sample/le-proxy.c /^main(int argc, char **argv)$/;" f
3648 main sample/signal-test.c /^main(int argc, char **argv)$/;" f
3649 main sample/time-test.c /^main(int argc, char **argv)$/;" f
3650 main test/bench.c /^main(int argc, char **argv)$/;" f
3651 main test/bench_cascade.c /^main(int argc, char **argv)$/;" f
3652 main test/bench_http.c /^main(int argc, char **argv)$/;" f
3653 main test/bench_httpclient.c /^main(int argc, char **argv)$/;" f
3654 main test/regress_main.c /^main(int argc, const char **argv)$/;" f
3655 main test/test-changelist.c /^main(int argc, char **argv)$/;" f
3656 main test/test-dumpevents.c /^main(int argc, char **argv)$/;" f
3657 main test/test-eof.c /^main(int argc, char **argv)$/;" f
3658 main test/test-fdleak.c /^main(int argc, char **argv)$/;" f
3659 main test/test-init.c /^main(int argc, char **argv)$/;" f
3660 main test/test-ratelim.c /^main(int argc, char **argv)$/;" f
3661 main test/test-time.c /^main(int argc, char **argv)$/;" f
3662 main test/test-weof.c /^main(int argc, char **argv)$/;" f
3663 main test/tinytest_demo.c /^main(int c, const char **v)$/;" f
3664 main_callback sample/dns-example.c /^main_callback(int result, char type, int count, int ttl,$/;" f file:
3665 main_testcases test/regress.c /^struct testcase_t main_testcases[] = {$/;" v typeref:struct:testcase_t
但是为什么 tag main, g ] 找不到包含 main 函数的文件列表？
即使启用了 autochdir，romainl 的解决方案也适用于 :tag name
我已经运行了：set tags=./tags,tags，即使当前目录更改为其他目录也可以工作，因为 autochdir 已启用，但 g ] 有时可能不起作用，为什么？
但 g ] 有时不起作用：
错误信息是E257: cstag: tag not found
编辑 2：.vimrc 的内容
cat ~/.vimrc
set autoindent
colorscheme desert
set number