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- REF REF
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- NAME
- ref - Display a C function header
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- SYNOPSIS
- ref [-t] [-c class]... [-f file]... tag
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- DESCRIPTION
- ref quickly locates and displays the header of a function.
- To do this, ref looks in the "tags" file for the line that
- describes the function, and then scans the source file for
- the function. When it locates the function, it displays an
- introductory comment (if there is one), the function's
- declaration, and the declarations of all arguments.
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- SEARCH METHOD
- ref uses a fairly sophisticated tag look-up algorithm. If
- you supply a filename via -f file, then elvis first scans
- the tags file for a static tag from that file. This search
- is limited to the tags file in the current directory.
-
- If you supply a classname via -c class, then elvis searches
- for a tag from that class. This search is not limited to
- the current directory; You can supply a list of directories
- in the environment variable TAGPATH, and ref will search
- through the "tags" file in each directory until it finds a
- tag in the desired class.
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- If that fails, ref will then try to look up an ordinary
- global tag. This search checks all of the directories
- listed in TAGPATH, too.
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- If you've given the -t flag, then ref will simply output the
- tag line that it found, and then exit. Without -t, though,
- ref will search for the tag line. It will try to open the
- source file, which should be in the same directory as the
- tags file where the tag was discovered. If the source file
- doesn't exist, or is unreadable, then ref will try to open a
- file called "refs" in that directory. Either way, ref will
- try to locate the tag, and display whatever it finds.
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- INTERACTION WITH ELVIS
- ref is used by elvis' shift-K command. If the cursor is
- located on a word such as "splat", in the file "foo.c", then
- elvis will invoke ref with the command "ref -f foo.c splat".
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- If elvis has been compiled with the -DEXTERNAL_TAGS flag,
- then elvis will use ref to scan the tags files. This is
- slower than the built-in tag searching, but it allows elvis
- to access the more sophisticated tag lookup provided by ref.
- Other than that, external tags should act exactly like
- internal tags.
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- Command Reference 1 Page 1
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- REF REF
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- OPTIONS
- -t Output tag info, instead of the function header.
-
- -f file
- The tag might be a static function in file. You can
- use several -f flags to have ref consider static tags
- from more than one file.
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- -c class
- The tag might be a member of class class. You can use
- several -c flags to have ref consider tags from more
- than one class.
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- FILES
- tags List of function names and their locations, generated
- by ctags.
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- refs Function headers extracted from source files
- (optional).
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- ENVIRONMENT
- TAGPATH
- List of directories to be searched. The elements in
- the list are separated by either semicolons (for MS-
- DOS, Atari TOS, and AmigaDos), or by colons (every
- other operating system). For each operating system,
- ref has a built-in default which is probably adequate.
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- NOTES
- You might want to generate a "tags" file the directory that
- contains the source code for standard C library on your
- system. If licensing restrictions prevent you from making
- the library source readable by everybody, then you can have
- ctags generate a "refs" file, and make "refs" readable by
- everybody.
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- If your system doesn't come with the library source code,
- then perhaps you can produce something workable from the
- lint libraries.
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- SEE ALSO
- elvis(1), ctags(1)
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- AUTHOR
- Steve Kirkendall
- kirkenda@cs.pdx.edu
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- Command Reference 1 Page 2
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