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misc/emacs: add new function godoc-at-point

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LGTM=adonovan
R=adonovan, ruiu
CC=golang-codereviews
https://golang.org/cl/107160048
This commit is contained in:
Dominik Honnef 2014-06-17 15:52:29 -04:00 committed by Alan Donovan
parent 2005bea7fd
commit 933f272e71
1 changed files with 44 additions and 12 deletions
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56
misc/emacs/go-mode.el
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@ -762,7 +762,7 @@ you save any file, kind of defeating the point of autoloading."
;;;###autoload
(defun godoc (query)
"Show go documentation for a query, much like M-x man."
"Show Go documentation for a query, much like M-x man."
(interactive (list (godoc--read-query)))
(unless (string= query "")
(set-process-sentinel
@ -771,6 +771,31 @@ you save any file, kind of defeating the point of autoloading."
'godoc--buffer-sentinel)
nil))
(defun godoc-at-point (point)
"Show Go documentation for the identifier at POINT.
`godoc-at-point' requires godef to work.
Due to a limitation in godoc, it is not possible to differentiate
between functions and methods, which may cause `godoc-at-point'
to display more documentation than desired."
;; TODO(dominikh): Support executing godoc-at-point on a package
;; name.
(interactive "d")
(condition-case nil
(let* ((output (godef--call point))
(file (car output))
(name-parts (split-string (cadr output) " "))
(first (car name-parts)))
(if (not (godef--successful-p file))
(message "%s" (godef--error file))
(godoc (format "%s %s"
(file-name-directory file)
(if (or (string= first "type") (string= first "const"))
(cadr name-parts)
(car name-parts))))))
(file-error (message "Could not run godef binary"))))
(defun go-goto-imports ()
"Move point to the block of imports.
@ -1039,6 +1064,21 @@ description at POINT."
(with-current-buffer outbuf
(split-string (buffer-substring-no-properties (point-min) (point-max)) "\n")))))
(defun godef--successful-p (output)
(not (or (string= "-" output)
(string= "godef: no identifier found" output)
(go--string-prefix-p "godef: no declaration found for " output)
(go--string-prefix-p "error finding import path for " output))))
(defun godef--error (output)
(cond
((godef--successful-p output)
nil)
((string= "-" output)
"godef: expression is not defined anywhere")
(t
output)))
(defun godef-describe (point)
"Describe the expression at POINT."
(interactive "d")
@ -1054,19 +1094,11 @@ description at POINT."
(interactive "d")
(condition-case nil
(let ((file (car (godef--call point))))
(cond
((string= "-" file)
(message "godef: expression is not defined anywhere"))
((string= "godef: no identifier found" file)
(message "%s" file))
((go--string-prefix-p "godef: no declaration found for " file)
(message "%s" file))
((go--string-prefix-p "error finding import path for " file)
(message "%s" file))
(t
(if (not (godef--successful-p file))
(message "%s" (godef--error file))
(push-mark)
(ring-insert find-tag-marker-ring (point-marker))
(godef--find-file-line-column file other-window))))
(godef--find-file-line-column file other-window)))
(file-error (message "Could not run godef binary"))))
(defun godef-jump-other-window (point)