mirror of
https://github.com/golang/go
synced 2024-11-18 13:34:41 -07:00
a69e659f44
Change-Id: Ic1fef2e237205ed392912601324415af625417b0 Reviewed-on: https://go-review.googlesource.com/19749 Reviewed-by: Dominik Honnef <dominik@honnef.co> Reviewed-by: Alan Donovan <adonovan@google.com>
289 lines
10 KiB
EmacsLisp
289 lines
10 KiB
EmacsLisp
;;;
|
|
;;; Integration of the Go 'guru' analysis tool into Emacs.
|
|
;;;
|
|
;;; To install the Go guru, run:
|
|
;;; $ go get golang.org/x/tools/cmd/guru
|
|
;;;
|
|
;;; Load this file into Emacs and set go-guru-scope to your
|
|
;;; configuration. Then, find a file of Go source code, enable
|
|
;;; go-guru-mode, select an expression of interest, and press `C-c C-o d'
|
|
;;; (for "describe") or run one of the other go-guru-xxx commands.
|
|
|
|
(require 'compile)
|
|
(require 'go-mode)
|
|
(require 'json)
|
|
(require 'simple)
|
|
(require 'cl)
|
|
|
|
(defgroup go-guru nil
|
|
"Options specific to the Go guru."
|
|
:group 'go)
|
|
|
|
(defcustom go-guru-command "guru"
|
|
"The Go guru command."
|
|
:type 'string
|
|
:group 'go-guru)
|
|
|
|
(defcustom go-guru-scope ""
|
|
"The scope of the analysis. See `go-guru-set-scope'."
|
|
:type 'string
|
|
:group 'go-guru)
|
|
|
|
(defvar go-guru--scope-history
|
|
nil
|
|
"History of values supplied to `go-guru-set-scope'.")
|
|
|
|
;; Extend go-mode-map.
|
|
(let ((m (define-prefix-command 'go-guru-map)))
|
|
(define-key m "d" #'go-guru-describe)
|
|
(define-key m "f" #'go-guru-freevars)
|
|
(define-key m "i" #'go-guru-implements)
|
|
(define-key m "c" #'go-guru-peers) ; c for channel
|
|
(define-key m "r" #'go-guru-referrers)
|
|
(define-key m "j" #'go-guru-definition) ; j for jump
|
|
(define-key m "p" #'go-guru-pointsto)
|
|
(define-key m "s" #'go-guru-callstack) ; s for stack
|
|
(define-key m "<" #'go-guru-callers)
|
|
(define-key m ">" #'go-guru-callees))
|
|
|
|
(define-key go-mode-map (kbd "C-c C-o") #'go-guru-map)
|
|
|
|
;; TODO(dominikh): Rethink set-scope some. Setting it to a file is
|
|
;; painful because it doesn't use find-file, and variables/~ aren't
|
|
;; expanded. Setting it to an import path is somewhat painful because
|
|
;; it doesn't make use of go-mode's import path completion. One option
|
|
;; would be having two different functions, but then we can't
|
|
;; automatically call it when no scope has been set. Also it wouldn't
|
|
;; easily allow specifying more than one file/package.
|
|
(defun go-guru-set-scope ()
|
|
"Set the scope for the Go guru, prompting the user to edit the
|
|
previous scope.
|
|
|
|
The scope specifies a set of arguments, separated by spaces.
|
|
It may be:
|
|
1) a set of packages whose main functions will be analyzed.
|
|
2) a list of *.go filenames; they will treated like as a single
|
|
package (see #3).
|
|
3) a single package whose main function and/or Test* functions
|
|
will be analyzed.
|
|
|
|
In the common case, this is similar to the argument(s) you would
|
|
specify to 'go build'."
|
|
(interactive)
|
|
(let ((scope (read-from-minibuffer "Go guru scope: "
|
|
go-guru-scope
|
|
nil
|
|
nil
|
|
'go-guru--scope-history)))
|
|
(if (string-equal "" scope)
|
|
(error "You must specify a non-empty scope for the Go guru"))
|
|
(setq go-guru-scope scope)))
|
|
|
|
(defun go-guru--run (mode &optional need-scope)
|
|
"Run the Go guru in the specified MODE, passing it the selected
|
|
region of the current buffer. If NEED-SCOPE, prompt for a scope
|
|
if not already set. Mark up the output using `compilation-node`,
|
|
replacing each file name with a small hyperlink, and display the
|
|
result."
|
|
(with-current-buffer (go-guru--exec mode need-scope)
|
|
(go-guru--compilation-markup)))
|
|
|
|
(defun go-guru--exec (mode &optional need-scope flags)
|
|
"Execute the Go guru in the specified MODE, passing it the
|
|
selected region of the current buffer. If NEED-SCOPE, prompt for
|
|
a scope if not already set. Return the output buffer."
|
|
(if (not buffer-file-name)
|
|
(error "Cannot use guru on a buffer without a file name"))
|
|
(and need-scope
|
|
(string-equal "" go-guru-scope)
|
|
(go-guru-set-scope))
|
|
(let* ((filename (file-truename buffer-file-name))
|
|
(posn (if (use-region-p)
|
|
(format "%s:#%d,#%d"
|
|
filename
|
|
(1- (go--position-bytes (region-beginning)))
|
|
(1- (go--position-bytes (region-end))))
|
|
(format "%s:#%d"
|
|
filename
|
|
(1- (position-bytes (point))))))
|
|
(env-vars (go-root-and-paths))
|
|
(goroot-env (concat "GOROOT=" (car env-vars)))
|
|
(gopath-env (concat "GOPATH=" (mapconcat #'identity (cdr env-vars) ":")))
|
|
(output-buffer (get-buffer-create "*go-guru*")))
|
|
(with-current-buffer output-buffer
|
|
(setq buffer-read-only nil)
|
|
(erase-buffer))
|
|
(with-current-buffer (get-buffer-create "*go-guru-input*")
|
|
(setq buffer-read-only nil)
|
|
(erase-buffer)
|
|
(go-guru--insert-modified-files)
|
|
(let* ((args (append (list "-modified"
|
|
"-scope" go-guru-scope)
|
|
flags
|
|
(list mode posn))))
|
|
;; Log the command to *Messages*, for debugging.
|
|
(message "Command: %s:" args)
|
|
(message nil) ; clears/shrinks minibuffer
|
|
(message "Running guru %s..." mode)
|
|
;; Use dynamic binding to modify/restore the environment
|
|
(let* ((process-environment (list* goroot-env gopath-env process-environment))
|
|
(c-p-args (append (list (point-min)
|
|
(point-max)
|
|
go-guru-command
|
|
nil ; delete
|
|
output-buffer
|
|
t)
|
|
args))
|
|
(exitcode (apply #'call-process-region c-p-args)))
|
|
;; If the command fails, don't show the output buffer,
|
|
;; but use its contents (sans final \n) as an error.
|
|
(unless (zerop exitcode)
|
|
(with-current-buffer output-buffer
|
|
(bury-buffer)
|
|
(error "%s" (buffer-substring (point-min) (1- (point-max)))))))))
|
|
output-buffer))
|
|
|
|
(defun go-guru--compilation-markup ()
|
|
"Present guru output in the current buffer using `compilation-mode'."
|
|
(insert "\n")
|
|
(compilation-mode)
|
|
(setq compilation-error-screen-columns nil)
|
|
|
|
;; Hide the file/line info to save space.
|
|
;; Replace each with a little widget.
|
|
;; compilation-mode + this loop = slooow.
|
|
;; TODO(adonovan): have guru give us JSON
|
|
;; and we'll do the markup directly.
|
|
(let ((buffer-read-only nil)
|
|
(p 1))
|
|
(while (not (null p))
|
|
(let ((np (compilation-next-single-property-change p 'compilation-message)))
|
|
(if np
|
|
(when (equal (line-number-at-pos p) (line-number-at-pos np))
|
|
;; Using a fixed width greatly improves readability, so
|
|
;; if the filename is longer than 20, show ".../last/17chars.go".
|
|
;; This usually includes the last segment of the package name.
|
|
;; Don't show the line or column number.
|
|
(let* ((loc (buffer-substring p np)) ; "/home/foo/go/pkg/file.go:1:2-3:4"
|
|
(i (search ":" loc)))
|
|
(setq loc (cond
|
|
((null i) "...")
|
|
((>= i 17) (concat "..." (substring loc (- i 17) i)))
|
|
(t (substring loc 0 i))))
|
|
;; np is (typically) the space following ":"; consume it too.
|
|
(put-text-property p np 'display (concat loc ":")))
|
|
(goto-char np)
|
|
(insert " ")
|
|
(incf np))) ; so we don't get stuck (e.g. on a panic stack dump)
|
|
(setq p np)))
|
|
(message nil))
|
|
|
|
(let ((w (display-buffer (current-buffer))))
|
|
(set-window-point w (point-min))))
|
|
|
|
(defun go-guru--insert-modified-files ()
|
|
"Insert the contents of each modified Go buffer into the
|
|
current buffer in the format specified by guru's -modified flag."
|
|
(mapc #'(lambda (b)
|
|
(and (buffer-modified-p b)
|
|
(buffer-file-name b)
|
|
(string= (file-name-extension (buffer-file-name b)) "go")
|
|
(progn
|
|
(insert (format "%s\n%d\n"
|
|
(buffer-file-name b)
|
|
(go-guru--buffer-size-bytes b)))
|
|
(insert-buffer-substring b))))
|
|
(buffer-list)))
|
|
|
|
(defun go-guru--buffer-size-bytes (&optional buffer)
|
|
"Return the number of bytes in the current buffer.
|
|
If BUFFER, return the number of characters in that buffer instead."
|
|
(with-current-buffer (or buffer (current-buffer))
|
|
(string-bytes (buffer-substring (point-min)
|
|
(point-max)))))
|
|
|
|
|
|
(defun go-guru--goto-pos (posn)
|
|
"Find the file containing the position POSN (of the form `file:line:col')
|
|
set the point to it, switching the current buffer."
|
|
(let ((file-line-pos (split-string posn ":")))
|
|
(find-file (car file-line-pos))
|
|
(goto-char (point-min))
|
|
;; NB: go/token's column offsets are byte- not rune-based.
|
|
(forward-line (1- (string-to-number (cadr file-line-pos))))
|
|
(forward-char (1- (string-to-number (caddr file-line-pos))))))
|
|
|
|
(defun go-guru-callees ()
|
|
"Show possible callees of the function call at the current point."
|
|
(interactive)
|
|
(go-guru--run "callees" t))
|
|
|
|
(defun go-guru-callers ()
|
|
"Show the set of callers of the function containing the current point."
|
|
(interactive)
|
|
(go-guru--run "callers" t))
|
|
|
|
(defun go-guru-callgraph ()
|
|
"Show the callgraph of the current program."
|
|
(interactive)
|
|
(go-guru--run "callgraph" t))
|
|
|
|
(defun go-guru-callstack ()
|
|
"Show an arbitrary path from a root of the call graph to the
|
|
function containing the current point."
|
|
(interactive)
|
|
(go-guru--run "callstack" t))
|
|
|
|
(defun go-guru-definition ()
|
|
"Jump to the definition of the selected identifier."
|
|
(interactive)
|
|
;; TODO(adonovan): use -format=sexpr when available to avoid a
|
|
;; dependency and to simplify parsing.
|
|
(let* ((res (with-current-buffer (go-guru--exec "definition" nil '("-format=json"))
|
|
(goto-char (point-min))
|
|
(cdr (car (json-read)))))
|
|
(desc (cdr (assoc 'desc res))))
|
|
(go-guru--goto-pos (cdr (assoc 'objpos res)))
|
|
(message "%s" desc)))
|
|
|
|
(defun go-guru-describe ()
|
|
"Describe the selected syntax, its kind, type and methods."
|
|
(interactive)
|
|
(go-guru--run "describe"))
|
|
|
|
(defun go-guru-pointsto ()
|
|
"Show what the selected expression points to."
|
|
(interactive)
|
|
(go-guru--run "pointsto" t))
|
|
|
|
(defun go-guru-implements ()
|
|
"Describe the 'implements' relation for types in the package
|
|
containing the current point."
|
|
(interactive)
|
|
(go-guru--run "implements"))
|
|
|
|
(defun go-guru-freevars ()
|
|
"Enumerate the free variables of the current selection."
|
|
(interactive)
|
|
(go-guru--run "freevars"))
|
|
|
|
(defun go-guru-peers ()
|
|
"Enumerate the set of possible corresponding sends/receives for
|
|
this channel receive/send operation."
|
|
(interactive)
|
|
(go-guru--run "peers" t))
|
|
|
|
(defun go-guru-referrers ()
|
|
"Enumerate all references to the object denoted by the selected
|
|
identifier."
|
|
(interactive)
|
|
(go-guru--run "referrers"))
|
|
|
|
(defun go-guru-whicherrs ()
|
|
"Show globals, constants and types to which the selected
|
|
expression (of type 'error') may refer."
|
|
(interactive)
|
|
(go-guru--run "whicherrs" t))
|
|
|
|
(provide 'go-guru)
|