Commit 20c65d08 authored by Bill Wohler's avatar Bill Wohler

(image-load-path-for-library): Merged changes from Reiner. Add

no-error argument. If path t, just return directory.
parent 08f99a54
......@@ -77,7 +77,7 @@ value is used as a list of directories to search.")
(list (file-name-as-directory (expand-file-name "images" data-directory))
'data-directory 'load-path)))
(defun image-load-path-for-library (library image &optional path)
(defun image-load-path-for-library (library image &optional path no-error)
"Return a suitable search path for images relative to LIBRARY.
Images for LIBRARY are searched for in \"../../etc/images\" and
......@@ -85,8 +85,12 @@ Images for LIBRARY are searched for in \"../../etc/images\" and
well as in `image-load-path' and `load-path'.
This function returns the value of `load-path' augmented with the
path to IMAGE. If PATH is given, it is used instead of
`load-path'.
directory containing IMAGE. If PATH is given, it is used instead
of `load-path'. If PATH is t, just return the directory that
contains IMAGE.
If NO-ERROR is non-nil, return nil if a suitable path can't be
found rather than signaling an error.
Here is an example that uses a common idiom to provide
compatibility with versions of Emacs that lack the variable
......@@ -137,11 +141,19 @@ compatibility with versions of Emacs that lack the variable
(setq img (directory-file-name parent)
dir (expand-file-name "../" dir)))
(setq image-directory dir)))))
(no-error
;; In this case we will return nil.
(message "Could not find image %s for library %s" image library))
(t
(error "Could not find image %s for library %s" image library)))
;; Return augmented `image-load-path' or `load-path'.
(cond ((and path (symbolp path))
;; Return the directory, nil if no-error was non-nil and a
;; suitable path could not be found, or an augmented
;; `image-load-path' or `load-path'.
(cond ((or (null image-directory)
(eq path t))
image-directory)
((and path (symbolp path))
(nconc (list image-directory)
(delete image-directory
(if (boundp path)
......
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