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Let Projectile choose haskell-build-type if possible #1874

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Let Projectile choose haskell-build-type if possible #1874

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59 changes: 39 additions & 20 deletions haskell-customize.el
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Original file line number Diff line number Diff line change
Expand Up @@ -410,33 +410,52 @@ imports."
"The path which is considered as project root, this is determined by the
presence of a *.cabal file or stack.yaml file or something similar.")

(defun haskell-projectile-build-type ()
(if (and (fboundp 'projectile-project-root) (bound-and-true-p projectile-mode))
(let* ((d (projectile-project-root))
(cabal (cl-find-if
(lambda (f) (string-match-p ".\\.cabal\\'" f))
(directory-files d))))
(cond
((and (file-exists-p (concat d "cabal.project")) (executable-find "cabal"))
(cons 'cabal-project d))
((and (file-exists-p (concat d "cabal.sandbox")) (executable-find "cabal"))
(cons 'cabal-sandbox d))
((and (file-exists-p (concat d "stack.yaml")) (executable-find "stack"))
(cons 'stack d))
((and cabal (file-exists-p (concat d cabal)) (executable-find "cabal"))
(cons 'cabal d))
((executable-find "ghc") (cons 'ghc nil))))
nil))

(defun haskell-build-type ()
"Looks for cabal and stack spec files.
When found, returns a pair (TAG . DIR)
where TAG is \\='cabal-project, \\='cabal-sandbox. \\='cabal, or \\='stack;
and DIR is the directory containing cabal or stack file.
When none found, DIR is nil, and TAG is \\='ghc"
;; REVIEW maybe just 'cabal is enough.
(let ((cabal-project (locate-dominating-file default-directory "cabal.project"))
(cabal-sandbox (locate-dominating-file default-directory "cabal.sandbox.config"))
(stack (locate-dominating-file default-directory "stack.yaml"))
(cabal (locate-dominating-file
default-directory
(lambda (d)
(cl-find-if
(lambda (f) (string-match-p ".\\.cabal\\'" f))
(directory-files d))))))
(cond
((and cabal-project (executable-find "cabal"))
(cons 'cabal-project cabal-project))
((and cabal-sandbox (executable-find "cabal"))
(cons 'cabal-sandbox cabal-sandbox))
((and stack (executable-find "stack"))
(cons 'stack stack))
((and cabal (executable-find "cabal"))
(cons 'cabal cabal))
((executable-find "ghc") (cons 'ghc nil))
(t (error "Could not find any installation of GHC.")))))
(or (haskell-projectile-build-type)
(let ((cabal-project (locate-dominating-file default-directory "cabal.project"))
(cabal-sandbox (locate-dominating-file default-directory "cabal.sandbox.config"))
(stack (locate-dominating-file default-directory "stack.yaml"))
(cabal (locate-dominating-file
default-directory
(lambda (d)
(cl-find-if
(lambda (f) (string-match-p ".\\.cabal\\'" f))
(directory-files d))))))
(cond
((and cabal-project (executable-find "cabal"))
(cons 'cabal-project cabal-project))
((and cabal-sandbox (executable-find "cabal"))
(cons 'cabal-sandbox cabal-sandbox))
((and stack (executable-find "stack"))
(cons 'stack stack))
((and cabal (executable-find "cabal"))
(cons 'cabal cabal))
((executable-find "ghc") (cons 'ghc nil))
(t (error "Could not find any installation of GHC."))))))

(defun haskell-process-type ()
"Return `haskell-process-type', or a guess if that variable is \\='auto.
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