Category : Word Processors
Archive   : ELVIB184.ZIP
Filename : CTAGS.DOC

Output of file : CTAGS.DOC contained in archive : ELVIB184.ZIP

ctags - Generates "tags" and (optionally) "refs" files

ctags [-BSstvraT] filesnames...

ctags generates the "tags" and "refs" files from a group
of C source files. The "tags" file is used by Elvis'
":tag" command, control-] command, and -t option. The
"refs" file is sometimes used by the ref(1) program.

Each C source file is scanned for #define statements and
global function definitions. The name of the macro or
function becomes the name of a tag. For each tag, a line
is added to the "tags" file which contains:
- the name of the tag
- a tab character
- the name of the file containing the tag
- a tab character
- a way to find the particular line within the file.

The filenames list will typically be the names of all C
source files in the current directory, like this:
$ ctags -stv *.[ch]

-B Normally, ctags encloses regular expressions in
slashes (/regexp/) which causes elvis to search
from the top of the file. The -B flag causes ctags
to enclose the regular expressions in question
marks (?regexp?) so elvis will search backward from
the bottom of the file. This rarely matters.

-t Include typedefs. A tag will be generated for each
user-defined type. Also tags will be generated for
struct and enum names. Types are considered to be
global if they are defined in a header file, and
static if they are defined in a C source file.

-v Include variable declarations. A tag will be gen-
erated for each variable, except for those that are
declared inside the body of a function.

-s Include static tags. Ctags will normally put
global tags in the "tags" file, and silently ignore
the static tags. This flag causes both global and
static tags to be added. The name of a static tag
is generated by prefixing the name of the declared
item with the name of the file where it is defined,
with a colon in between. For example, "static
foo(){}" in "bar.c" results in a tag named



-S Include static tags, but make them look like global
tags. Most tags-aware programs don't like the
"filename:tagname" tags produced by the -s flag, so
-S was added as an alternative. If elvis and ref
are the only programs that read the tags file, then
you don't need -S; otherwise you do.

-r This causes ctags to generate both "tags" and
"refs". Without -r, it would only generate "tags".

-a Append to "tags", and maybe "refs". Normally,
ctags overwrites these files each time it is
invoked. This flag is useful when you have to many
files in the current directory for you to list them
on a single command-line; it allows you to split
the arguments among several invocations.

-T This flag isn't available on all systems. UNIX has
it, but most others don't. The -T flag prevents
ctags from generating a "tags" file. This is use-
ful when you want to generate a "refs" without
changing "tags".

tags A cross-reference that lists each tag name, the
name of the source file that contains it, and a way
to locate a particular line in the source file.

refs The "refs" file contains the definitions for each
tag in the "tags" file, and very little else. This
file can be useful, for example, when licensing
restrictions prevent you from making the source
code to the standard C library readable by every-
body, but you still everybody to know what argu-
ments the library functions need.

ctags is sensitive to indenting and line breaks. Conse-
quently, it might not discover all of the tags in a file
that is formatted in an unusual way.

elvis(1), refs(1)

Steve Kirkendall
[email protected]


  3 Responses to “Category : Word Processors
Archive   : ELVIB184.ZIP
Filename : CTAGS.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: