go.tools/oracle: change -ptalog default to "".

Also: add a TODO.

R=crawshaw
CC=golang-dev
https://golang.org/cl/13352043

cmd/oracle/main.go

@@ -36,7 +36,7 @@ var posFlag = flag.String("pos", "",
 var modeFlag = flag.String("mode", "",
 	"Mode of query to perform: callers, callees, callstack, callgraph, describe.")
 
-var ptalogFlag = flag.String("ptalog", "pta.log",
+var ptalogFlag = flag.String("ptalog", "",
 	"Location of the points-to analysis log file, or empty to disable logging.")
 
 const usage = `Go source code oracle.

cmd/oracle/oracle.el

@@ -89,7 +89,6 @@ result."
       (erase-buffer)
       (insert "Go Oracle\n")
       (let ((args (append (list go-oracle-command nil t nil
-                                "-ptalog=" ; avoid writing the huge log
                                 (format "-pos=%s %s" filename pos)
                                 (format "-mode=%s" mode))
                           (split-string go-oracle-scope " " t))))
@@ -118,6 +117,7 @@ result."
             (p 1))
         (while (not (null p))
           (let ((np (compilation-next-single-property-change p 'compilation-message)))
+            ;; TODO(adonovan): this can be verbose in the *Messages* buffer.
             (message "Post-processing link (%d%%)" (/ (* p 100) (point-max)))
             (if np
                 (when (equal (line-number-at-pos p) (line-number-at-pos np))

cmd/oracle/oracle.vim

@@ -29,7 +29,7 @@ set errorformat+=%f:%l.%c-%*[0-9].%*[0-9]:\ %m
 func! s:RunOracle(mode) abort
   let s:pos = line2byte(line("."))+col(".")
   let s:errfile = tempname()
-  let s:cmd = printf("!%s -ptalog= -mode=%s '-pos=%s %d' %s >%s",
+  let s:cmd = printf("!%s -mode=%s '-pos=%s %d' %s >%s",
     \ s:go_oracle, a:mode, bufname(""), s:pos, s:scope, s:errfile)
   execute s:cmd
   execute "cfile " . s:errfile