I have a directory name (as string) with a tilde: ~/projects.
I want to get its fullpath: /home/user/projects. How do I do that ?
The goal is to pass it to uiop:run-program, that doesn't seem to do the right thing©.
With this answer: How to translate (make-pathname :directory '(:absolute :home "directoryiwant") into absolute path
(merge-pathnames
(make-pathname
:directory '(:relative "~/projects"))
(user-homedir-pathname))
#P"/home/me/~/projects/"
=> WRONG
Thank you.
edit I'll share more context.
I wanted to run a program through uiop:launch-program. I had a user-defined list of directories such as ~/projects. Using it as is created the ./~/projects directory instead of /home/user/projects.
truename doesn't work if the directory doesn't exist.
On SBCL, (namestring "~/doesntexist") returns also its tilde.
merge-pathnames didn't work, still the tilde problem.
Feeding ensure-directories-exist with this result created a directory named ~.
Given the answers, I had no choice but to adapt the logic to expand the directory name of a directory we actually want to exist.
;; Create a directory
;; Ensure its name (string) ends with a slash.
(setf mydir
(str:concat (string-right-trim (list #\/) mydir)
"/"))
(ensure-directories-exist base)
Then I could use its truename.
There is a native-namestring function in uiop, which should be available in all implementations:
(uiop:native-namestring "~/projects")
=> /home/user/projects