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bug#23219: 25.0.92; Find command cannot be customized for grep-find

From: Eli Zaretskii
Subject: bug#23219: 25.0.92; Find command cannot be customized for grep-find
Date: Tue, 05 Apr 2016 18:01:34 +0300

> From: Dmitry Gutov <address@hidden>
> Date: Tue, 5 Apr 2016 00:16:32 +0300
> On 04/04/2016 11:37 PM, Eli Zaretskii wrote:
> > On one of my machines, the GNU Find utility's executable file is named
> > 'gfind'.  To have xref-collect-matches work, I customized
> > grep-find-command to have the value "gfind", but the find-grep pipe
> > used after that still tried to invoke 'find', not 'gfind'.
> You need grep-find-template, not grep-find-command.
> > Looking
> > around, I see that grep-compute-defaults effectively ignores
> > grep-find-command and uses the value of find-program instead.  Now,
> > find-program is a defvar, so it wasn't supposed to be customized.  Its
> > value is never changed, no matter what are your customizations.
> Yes, it's a mess. Auto-computed custom variable values don't make much 
> sense to me either, but maybe the idea is if you want to change the 
> program to use as 'find', it'll likely have a slightly different syntax 
> (not in your case, though), and grep-compute-defaults might fail to 
> work, so you're better off customizing the end values.

I see.  But if only the name of the program's executable changes, then
customizing everything would be an overkill, IMO.

> > How am I supposed to make this stuff work in this situation?  If the
> > solution is to poke find-program,
> Probably.
> > it should be defcustom,
> *shrug*

OK, suggested patch below.  Thanks for the feedback.

--- lisp/progmodes/grep.el~0    2016-02-15 06:39:16.000000000 +0200
+++ lisp/progmodes/grep.el      2016-04-05 17:45:42.595409800 +0300
@@ -411,21 +411,33 @@
 This gets tacked on the end of the generated expressions.")
-(defvar grep-program (purecopy "grep")
+(defcustom grep-grep-program (purecopy "grep")
   "The default grep program for `grep-command' and `grep-find-command'.
-This variable's value takes effect when `grep-compute-defaults' is called.")
+This variable's value takes effect when `grep-compute-defaults' is called."
+  :type 'string
+  :set 'grep-apply-setting
+  :version "25.1"
+  :group 'grep)
-(defvar find-program (purecopy "find")
+(defcustom grep-find-program (purecopy "find")
   "The default find program.
 This is used by commands like `grep-find-command', `find-dired'
-and others.")
+and others."
+  :type 'string
+  :set 'grep-apply-setting
+  :version "25.1"
+  :group 'grep)
-(defvar xargs-program (purecopy "xargs")
+(defcustom grep-xargs-program (purecopy "xargs")
   "The default xargs program for `grep-find-command'.
 See `grep-find-use-xargs'.
-This variable's value takes effect when `grep-compute-defaults' is called.")
+This variable's value takes effect when `grep-compute-defaults' is called."
+  :type 'string
+  :set 'grep-apply-setting
+  :version "25.1"
+  :group 'grep)
 (defvar grep-find-use-xargs nil
@@ -549,8 +561,8 @@
                          (grep-probe grep-command
                                      `(nil t nil "^English" ,hello-file)
-                       ;; otherwise use `grep-program'
-                       (grep-probe grep-program
+                       ;; otherwise use `grep-grep-program'
+                       (grep-probe grep-grep-program
                                    `(nil t nil "-nH" "^English" ,hello-file)))
                        (goto-char (point-min))
@@ -561,7 +573,7 @@
     (when (eq grep-highlight-matches 'auto-detect)
       (setq grep-highlight-matches
-             (and (grep-probe grep-program '(nil t nil "--help"))
+             (and (grep-probe grep-grep-program '(nil t nil "--help"))
                     (goto-char (point-min))
                     (search-forward "--color" nil t))
@@ -573,16 +585,16 @@
                 grep-template grep-find-template)
       (let ((grep-options
             (concat (if grep-use-null-device "-n" "-nH")
-                    (if (grep-probe grep-program
+                    (if (grep-probe grep-grep-program
                                     `(nil nil nil "-e" "foo" ,null-device)
                                     nil 1)
                         " -e"))))
        (unless grep-command
          (setq grep-command
-               (format "%s %s %s " grep-program
+               (format "%s %s %s " grep-grep-program
                          (and grep-highlight-matches
-                              (grep-probe grep-program
+                              (grep-probe grep-grep-program
                                           `(nil nil nil "--color" "x" 
                                           nil 1)
                               (if (eq grep-highlight-matches 'always)
@@ -591,17 +603,18 @@
        (unless grep-template
          (setq grep-template
-               (format "%s <X> <C> %s <R> <F>" grep-program grep-options)))
+               (format "%s <X> <C> %s <R> <F>" grep-grep-program 
        (unless grep-find-use-xargs
          (setq grep-find-use-xargs
-                ((grep-probe find-program
+                ((grep-probe grep-find-program
                              `(nil nil nil ,null-device "-exec" "echo"
                                    "{}" "+"))
-                  (grep-probe find-program `(nil nil nil ,null-device 
-                  (grep-probe xargs-program `(nil nil nil "-0" "echo")))
+                  (grep-probe grep-find-program
+                               `(nil nil nil ,null-device "-print0"))
+                  (grep-probe grep-xargs-program `(nil nil nil "-0" "echo")))
@@ -612,10 +625,11 @@
                       ;; after the pipe symbol be quoted if they use
                       ;; forward slashes as directory separators.
                       (format "%s . -type f -print0 | \"%s\" -0 %s"
-                              find-program xargs-program grep-command))
+                              grep-find-program grep-xargs-program
+                               grep-command))
                      ((memq grep-find-use-xargs '(exec exec-plus))
                       (let ((cmd0 (format "%s . -type f -exec %s"
-                                          find-program grep-command))
+                                          grep-find-program grep-command))
                             (null (if grep-use-null-device
                                       (format "%s " null-device)
@@ -627,27 +641,28 @@
                          (1+ (length cmd0)))))
                       (format "%s . -type f -print | \"%s\" %s"
-                              find-program xargs-program grep-command)))))
+                              grep-find-program grep-xargs-program
+                               grep-command)))))
        (unless grep-find-template
          (setq grep-find-template
                (let ((gcmd (format "%s <C> %s <R>"
-                                   grep-program grep-options))
+                                   grep-grep-program grep-options))
                      (null (if grep-use-null-device
                                (format "%s " null-device)
                  (cond ((eq grep-find-use-xargs 'gnu)
                         (format "%s <D> <X> -type f <F> -print0 | \"%s\" -0 %s"
-                                find-program xargs-program gcmd))
+                                grep-find-program grep-xargs-program gcmd))
                        ((eq grep-find-use-xargs 'exec)
                         (format "%s <D> <X> -type f <F> -exec %s {} %s%s"
-                                find-program gcmd null
+                                grep-find-program gcmd null
                                 (shell-quote-argument ";")))
                        ((eq grep-find-use-xargs 'exec-plus)
                         (format "%s <D> <X> -type f <F> -exec %s %s{} +"
-                                find-program gcmd null))
+                                grep-find-program gcmd null))
                         (format "%s <D> <X> -type f <F> -print | \"%s\" %s"
-                                find-program xargs-program gcmd))))))))
+                                grep-find-program grep-xargs-program 
     ;; Save defaults for this host.
     (setq grep-host-defaults-alist
@@ -1080,7 +1095,7 @@
 (defun zrgrep (regexp &optional files dir confirm template)
   "Recursively grep for REGEXP in gzipped FILES in tree rooted at DIR.
-Like `rgrep' but uses `zgrep' for `grep-program', sets the default
+Like `rgrep' but uses `zgrep' for `grep-grep-program', sets the default
 file name to `*.gz', and sets `grep-highlight-matches' to `always'."
@@ -1088,7 +1103,7 @@
      ;; Compute the default zrgrep command by running `grep-compute-defaults'
      ;; for grep program "zgrep", but not changing global values.
-     (let ((grep-program "zgrep")
+     (let ((grep-grep-program "zgrep")
           ;; Don't change global values for variables computed
           ;; by `grep-compute-defaults'.
           (grep-find-template nil)

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