Re: [vile] vile does not understand certain entries in "tags" files generated by `ctags'.

[Thomas Dickey]

On Fri, Mar 09, 2018 at 05:37:24PM +0100, j. van den hoff wrote:
> I have a "tags" file of function definitions in the `R' language
> (https://www.r-project.org). function names can contain periods, so I have
> lines such as
> 
> disp.array      fzrutils/R/disp.array.R /^disp.array <- function ($/;"  f
> 
> in the "tags" file. my `.vilerc' contains
> 
> set tags {path_to_the_tags_file}
> set tagrelative
> 
> `vi -t disp.array' does not work as expected but reacts the same way it does
> when a non-existent tag is specified (just reporting the read-in config
> files: "Reading ~/vile.rc" etc.). tags not containing a `.'  in the function
> name work just fine. `vim -t disp.array' does the expected even if the `.'
> is present in the name.
> 
> Am I missing something or is this a bug?

When doing ^]], vile's using a function checks only the character class,
and stops when a character isn't an "identifier":

int
screen_to_ident(char *buf, size_t bufn)
{
    int rc = FALSE;
    CHARTYPE mask = vl_ident;
    int whole_line = adjust_chartype(&mask);

    TRACE((T_CALLED "screen_to_ident\n"));
    rc = read_by_regex(buf, bufn, b_val_rexp(curbp, VAL_IDENTIFIER_EXPR), 
whole_line);
    if (rc == FALSE)
        rc = read_by_ctype(buf, bufn, mask, whole_line);
    returnCode(rc);
}

:show-printable shows that it's not (by default) an "id" character:

45      -        -   -   -   -  -   prn pun -   -  path -   arg -  nsp -   tmp 
sh
46      .        -   -   -   -  -   prn pun -   -  path -   arg -  nsp -   tmp 
sh
47      /        -   -   -   -  -   prn pun -   -  path -   -   -  nsp -   tmp 
sh
48      0        -   -   num -  -   prn -   -   id path -   arg -  nsp qid tmp 
sh
49      1        -   -   num -  -   prn -   -   id path -   arg -  nsp qid tmp 
sh

You could change that with

        set-char-class id=[.]
 
45      -        -   -   -   -  -   prn pun -   -  path -   arg -  nsp -   tmp 
sh
46      .        -   -   -   -  -   prn pun -   id path -   arg -  nsp -   tmp 
sh
47      /        -   -   -   -  -   prn pun -   -  path -   -   -  nsp -   tmp 
sh
48      0        -   -   num -  -   prn -   -   id path -   arg -  nsp qid tmp 
sh
49      1        -   -   num -  -   prn -   -   id path -   arg -  nsp qid tmp 
sh

> seen with vile version 9.8o for darwin14.3.0.
> 
> thank you
> 
> joerg
> 
> PS: I also presume, there is a small `ctags' bug here. the search pattern
> probably should backslash-protect the period in order to actually only match
> `disp.array' verbatim rather than
> disp{any-single-character}array, no? otherwise one might jump to the wrong
> tag/file/position.

hmm - I think it's correct, since "magic" is normally set.

-- 
Thomas E. Dickey <address@hidden>
https://invisible-island.net
ftp://ftp.invisible-island.net

signature.asc
Description: Digital signature