+(defun* coerce-pathname (name &key type defaults)
+ "coerce NAME into a PATHNAME.
+When given a string, portably decompose it into a relative pathname:
+#\\/ separates subdirectories. The last #\\/-separated string is as follows:
+if TYPE is NIL, its last #\\. if any separates name and type from from type;
+if TYPE is a string, it is the type, and the whole string is the name;
+if TYPE is :DIRECTORY, the string is a directory component;
+if the string is empty, it's a directory.
+Any directory named .. is read as :BACK.
+Host, device and version components are taken from DEFAULTS."
+ ;; The defaults are required notably because they provide the default host
+ ;; to the below make-pathname, which may crucially matter to people using
+ ;; merge-pathnames with non-default hosts, e.g. for logical-pathnames.
+ ;; NOTE that the host and device slots will be taken from the defaults,
+ ;; but that should only matter if you later merge relative pathnames with
+ ;; CL:MERGE-PATHNAMES instead of ASDF:MERGE-PATHNAMES*
+ (etypecase name
+ ((or null pathname)
+ name)
+ (symbol
+ (coerce-pathname (string-downcase name) :type type :defaults defaults))
+ (string
+ (multiple-value-bind (relative path filename)
+ (component-name-to-pathname-components name :force-directory (eq type :directory)
+ :force-relative t)
+ (multiple-value-bind (name type)
+ (cond
+ ((or (eq type :directory) (null filename))
+ (values nil nil))
+ (type
+ (values filename type))
+ (t
+ (split-name-type filename)))
+ (apply 'make-pathname :directory (cons relative path) :name name :type type
+ (when defaults `(:defaults ,defaults))))))))
+
+(defun* merge-component-name-type (name &key type defaults)
+ ;; For backwards compatibility only, for people using internals.
+ ;; Will be removed in a future release, e.g. 2.016.
+ (warn "Please don't use ASDF::MERGE-COMPONENT-NAME-TYPE. Use ASDF:COERCE-PATHNAME.")
+ (coerce-pathname name :type type :defaults defaults))
+
+(defun* subpathname (pathname subpath &key type)
+ (and pathname (merge-pathnames* (coerce-pathname subpath :type type)
+ (pathname-directory-pathname pathname))))
+
+(defun subpathname* (pathname subpath &key type)
+ (and pathname
+ (subpathname (ensure-directory-pathname pathname) subpath :type type)))
+
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