provide correct feature

[tarsius]

The feature has to match the filename; otherwise (require FEATURE) won't work.

[tarsius]

ping

[tamzinblake]

Can you give an example? I haven't run into this problem.

Also, if this is true, then it would probably be better to change the filename rather than the mode name.

[tarsius]

From the elisp info page:

 -- Function: require feature &optional filename noerror
     This function checks whether FEATURE is present in the current
     Emacs session (using `(featurep FEATURE)'; see below).  The
     argument FEATURE must be a symbol.

     If the feature is not present, then `require' loads FILENAME with
     `load'.  If FILENAME is not supplied, then the name of the symbol
     FEATURE is used as the base file name to load.  However, in this
     case, `require' insists on finding FEATURE with an added `.el' or
     `.elc' suffix (possibly extended with a compression suffix); a
     file whose name is just FEATURE won't be used.  (The variable
     `load-suffixes' specifies the exact required Lisp suffixes.)

     If NOERROR is non-`nil', that suppresses errors from actual
     loading of the file.  In that case, `require' returns `nil' if
     loading the file fails.  Normally, `require' returns FEATURE.

     If loading the file succeeds but does not provide FEATURE,
     `require' signals an error, `Required feature FEATURE was not
     provided'.

It doesn't mention trying with suffix -mode removed or added. And it does mention that failing to provide the correct feature will cause an error. So... it is true :-)

$ echo "(provide 'foo-mode)" > somewhere/in/load-path/foo.el
M-x eval-expression RET (require 'foo-mode) RET
Debugger entered--Lisp error: (file-error "Cannot open load file" "foo-mode")
  require(foo-mode)
  eval((require (quote foo-mode)) nil)
  eval-expression((require (quote foo-mode)) nil)
  call-interactively(eval-expression t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)
M-x eval-expression RET (require 'foo) RET
Debugger entered--Lisp error: (error "Required feature `foo' was not provided")
  require(foo)
  eval((require (quote foo)) nil)
  eval-expression((require (quote foo)) nil)
  call-interactively(eval-expression t nil)
  execute-extended-command(nil)
  call-interactively(execute-extended-command nil nil)

If you haven't run into this problem then this is because you load the library differently; e.g. using load-file or with the help of extracted autoload definitions.

Yes, renaming the file is another option.

[tarsius]

Have you decided how to fix this problem yet?

[tarsius]

ping

[tamzinblake]

Does that work?