| [9] | 1 | .TH REF 1
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| 2 | .SH NAME
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| 3 | ref - Display a C function header
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| 4 | .SH SYNOPSIS
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| 5 | \fBref\fR [-t] [-c \fIclass\fR]... [-f \fIfile\fR]... \fItag\fR
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| 6 | .SH DESCRIPTION
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| 7 | \fIref\fP quickly locates and displays the header of a function.
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| 8 | To do this, \fIref\fR
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| 9 | looks in the "tags" file for the line that describes the function, and then
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| 10 | scans the source file for the function.
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| 11 | When it locates the function, it displays an introductory comment
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| 12 | (if there is one), the function's declaration, and the declarations of all
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| 13 | arguments.
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| 14 | .SH "SEARCH METHOD"
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| 15 | .PP
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| 16 | \fIref\fR uses a fairly sophisticated tag look-up algorithm.
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| 17 | If you supply a filename via \fB-f\fR \fIfile\fR, then elvis first scans
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| 18 | the tags file for a static tag from that file.
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| 19 | This search is limited to the tags file in the current directory.
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| 20 | .PP
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| 21 | If you supply a classname via \fB-c\fR \fIclass\fR, then elvis searches
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| 22 | for a tag from that class.
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| 23 | This search is not limited to the current directory;
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| 24 | You can supply a list of directories in the environment variable \fITAGPATH\fR,
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| 25 | and \fIref\fR will search through the "tags" file in each directory until it finds
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| 26 | a tag in the desired class.
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| 27 | .PP
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| 28 | If that fails, \fIref\fR will then try to look up an ordinary global tag.
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| 29 | This search checks all of the directories listed in \fITAGPATH\fR, too.
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| 30 | .PP
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| 31 | If you've given the \fB-t\fR flag, then \fIref\fR will simply output the tag line that
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| 32 | it found, and then exit.
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| 33 | Without \fB-t\fR, though, \fIref\fR will search for the tag line.
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| 34 | It will try to open the source file, which should be in the same directory
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| 35 | as the tags file where the tag was discovered.
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| 36 | If the source file doesn't exist, or is unreadable, then \fIref\fR will try to open
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| 37 | a file called "\fIrefs\fR" in that directory.
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| 38 | Either way, \fIref\fR will try to locate the tag, and display whatever it finds.
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| 39 | .SH "INTERACTION WITH ELVIS"
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| 40 | .PP
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| 41 | \fIref\fP is used by \fIelvis\fR' shift-K command.
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| 42 | If the cursor is located on a word such as "splat", in the file "foo.c",
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| 43 | then \fIelvis\fR will invoke \fIref\fR with the command "ref -f foo.c splat".
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| 44 | .PP
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| 45 | If \fIelvis\fR has been compiled with the -DEXTERNAL_TAGS flag, then \fIelvis\fR will
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| 46 | use \fIref\fR \fB\fRto scan the tags files.
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| 47 | This is slower than the built-in tag searching, but it allows \fIelvis\fR to access
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| 48 | the more sophisticated tag lookup provided by \fIref\fR.
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| 49 | Other than that, external tags should act exactly like internal tags.
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| 50 | .SH OPTIONS
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| 51 | .IP \fB-t\fR
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| 52 | Output tag info, instead of the function header.
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| 53 | .IP "\fB-f\fR \fIfile\fR"
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| 54 | The tag might be a static function in \fIfile\fR.
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| 55 | You can use several -f flags to have \fIref\fR consider static tags from more than one file.
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| 56 | .IP "\fB-c\fR \fIclass\fR"
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| 57 | The tag might be a member of class \fIclass\fR.
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| 58 | You can use several -c flags to have \fIref\fR consider tags from more than one class.
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| 59 | .SH FILES
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| 60 | .IP \fBtags\fR
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| 61 | List of function names and their locations, generated by \fIctags\fR.
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| 62 | .IP \fBrefs\fR
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| 63 | Function headers extracted from source files (optional).
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| 64 | .SH ENVIRONMENT
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| 65 | .IP \fBTAGPATH\fR
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| 66 | List of directories to be searched.
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| 67 | The elements in the list are separated by either
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| 68 | semicolons (for MS-DOS, Atari TOS, and AmigaDos), or
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| 69 | by colons (every other operating system).
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| 70 | For each operating system, \fIref\fR has a built-in default which is probably
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| 71 | adequate.
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| 72 | .SH NOTES
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| 73 | .PP
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| 74 | You might want to generate a "tags" file the directory that contains the
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| 75 | source code for standard C library on your system.
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| 76 | If licensing restrictions prevent you from making the library source readable
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| 77 | by everybody, then you can have \fIctags\fR generate a "refs" file,
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| 78 | and make "refs" readable by everybody.
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| 79 | .PP
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| 80 | If your system doesn't come with the library source code, then perhaps you
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| 81 | can produce something workable from the \fIlint\fR libraries.
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| 82 | .SH "SEE ALSO"
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| 83 | elvis(1), ctags(1)
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| 84 | .SH AUTHOR
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| 85 | .nf
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| 86 | Steve Kirkendall
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| 87 | kirkenda@cs.pdx.edu
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| 88 | .fi
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