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Add optional candidates limit arg, remove unused item from result #781

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Jul 27, 2015
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Add optional candidates limit arg, remove unused item from result #781

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21 changes: 14 additions & 7 deletions haskell-process.el
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Original file line number Diff line number Diff line change
Expand Up @@ -286,23 +286,30 @@ This uses `accept-process-output' internally."
(haskell-process-queue-flush process)
(car-safe (haskell-command-state cmd))))

(defun haskell-process-get-repl-completions (process inputstr)
"Perform `:complete repl ...' query for INPUTSTR using PROCESS."
(let* ((reqstr (concat ":complete repl "
(defun haskell-process-get-repl-completions (process inputstr &optional limit)
"Perform `:complete repl ...' query for INPUTSTR using PROCESS.
Give optional LIMIT arg to limit completion candidates count,
zero, negative values, and nil means all possible completions.
Returns NIL when no completions found."
(let* ((mlimit (if (and limit (> limit 0))
(concat " " (number-to-string limit) " ")
" "))
(reqstr (concat ":complete repl"
mlimit
(haskell-string-literal-encode inputstr)))
(rawstr (haskell-process-queue-sync-request process reqstr)))
;; TODO use haskell-utils-parse-repl-response
(if (string-prefix-p "unknown command " rawstr)
(error "GHCi lacks `:complete' support (try installing 7.8 or ghci-ng)")
(let* ((s1 (split-string rawstr "\r?\n" t))
(cs (mapcar #'haskell-string-literal-decode (cdr s1)))
(h0 (car s1))) ;; "<cnt1> <cnt2> <quoted-str>"
(h0 (car s1))) ;; "<limit count> <all count> <unused string>"
(unless (string-match "\\`\\([0-9]+\\) \\([0-9]+\\) \\(\".*\"\\)\\'" h0)
(error "Invalid `:complete' response"))
(let ((cnt1 (match-string 1 h0))
(h1 (haskell-string-literal-decode (match-string 3 h0))))
(let ((cnt1 (match-string 1 h0)))
(unless (= (string-to-number cnt1) (length cs))
(error "Lengths inconsistent in `:complete' reponse"))
(cons h1 cs))))))
cs)))))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Accessing the process
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