[ dropping bug-coreutils, this mail doesn't address that question ]

* Eric Blake wrote on Mon, Jun 14, 2010 at 10:23:51PM CEST:
> On 06/14/2010 01:45 PM, Ralf Wildenhues wrote:
> > * Eric Blake wrote on Mon, Jun 14, 2010 at 07:22:31PM CEST:
> >> Did you make sure that AT_COLOR_TESTS can be specified either side of
> >> AT_INIT, or is there a fixed invocation order that authors must be aware 
> >> of?
> > 
> > Right now it has to be specified before AT_INIT.  If there's a diversion
> > thinhy we can easily fix that with, great, otherwise I guess it would
> > need documentation and order warning in the code.  Help?
> 
> It seems like it would merely be a matter of unconditionally emitting
> at_color=no in an early diversion, and having AT_COLOR_TESTS emit
> at_color=auto in an intermediate diversion, all before the option
> parsing that appears in a later diversion.  That way, if the user didn't
> specify --color, they pick up the appropriate default.
> 
> That also implies that anything else that checks at m4-time whether
> AT_color is defined (such as your m4_ifdef for changing the --help
> output text) must be m4_wrap'd to delay any output based on that
> decision of AT_color until after the user's source file has been
> completely read in.  Then again, we already m4_wrap some of our --help
> text in order to accurately tell the user how many AT_SETUPs we
> encountered, so this may already be taken care of given the current
> architecture of autotest.

I think I got that working now, incremental patch below and full one
attached.  It wasn't even necessary to output at_color initialization
more than once.

One problem I see with this change is that the code documents

  #  - HELP_TUNING
  #    Tuning help text.  Additional tuning options can be appended as
  #    self-contained cat'd here-docs as generated by AS_HELP_STRING.

so when we now use m4_wrap, tuning help from the user will get added
before our own, right?  So this is at least a semantic change.  FWIW,
I haven't found instances of HELP_TUNING in an online code search.

Add another diversion HELP_TUNING_BASE and let HELP_TUNING be for the
user?

Cheers,
Ralf

diff --git a/lib/autotest/general.m4 b/lib/autotest/general.m4
index c2fc369..23bf145 100644
--- a/lib/autotest/general.m4
+++ b/lib/autotest/general.m4
@@ -389,8 +389,6 @@ at_jobs=1
 at_traceon=:
 at_trace_echo=:
 at_check_filter_trace=:
-# Whether to enable colored test results.
-at_color=m4_ifdef([AT_color], [AT_color], [no])
 
 # Shall we keep the debug scripts?  Must be `:' when the suite is
 # run by a debug script, so that the script doesn't remove itself.
@@ -425,6 +423,8 @@ m4_define([_AT_FINISH],
 [m4_ifdef([AT_ingroup], [m4_fatal([missing AT_CLEANUP detected])])dnl
 m4_divert_text([DEFAULTS],
 [
+# Whether to enable colored test results.
+at_color=m4_ifdef([AT_color], [AT_color], [no])
 # List of the tested programs.
 at_tested='m4_ifdef([AT_tested],
   [m4_translit(m4_dquote(m4_defn([AT_tested])), [ ], m4_newline)])'
@@ -721,7 +721,7 @@ Operation modes:
   -l, --list     describes all the tests, or the selected TESTS
 _ATEOF
 m4_divert_pop([HELP_MODES])dnl
-m4_divert_push([HELP_TUNING])dnl
+m4_wrap([m4_divert_push([HELP_TUNING])dnl
 cat <<_ATEOF || at_write_fail=1
 
 dnl extra quoting prevents emacs whitespace mode from putting tabs in output
@@ -745,7 +745,7 @@ Execution tuning:
 [                 default for debugging scripts]
   -x, --trace    enable tests shell tracing
 _ATEOF
-m4_divert_pop([HELP_TUNING])dnl
+m4_divert_pop([HELP_TUNING])])dnl
 m4_divert_push([HELP_END])dnl
 cat <<_ATEOF || at_write_fail=1
 
commit f372e5ba28b1fe30ce4f1f51ef29910efbfa3510
Author: Ralf Wildenhues <[email protected]>
Date:   Tue Jun 15 21:19:14 2010 +0200

    Autotest: enable colored test results.
    
    * lib/autotest/general.m4 (AT_INIT): Accept --color and
    --color=no|never|yes|auto|always.  If desired, colorize test
    results and testsuite summary on standard output.
    [HELP_TUNING]: Wrap this help diversion until the end, when we
    know whether AT_COLOR_TESTS has been specified.
    (AT_COLOR_TESTS): New macro, set the default for color to auto.
    * doc/autoconf.texi (Writing Testsuites): Document it.
    (testsuite Invocation): Document --color* options.
    * tests/local.at: Call AT_COLOR_TESTS for Autoconf's testsuite.
    * tests/autotest.at (color test results): New test, mirroring
    color.test from Automake.
    * NEWS: Update.

diff --git a/NEWS b/NEWS
index f2290a1..0ff482f 100644
--- a/NEWS
+++ b/NEWS
@@ -36,6 +36,8 @@ GNU Autoconf NEWS - User visible changes.
    AT_ARG_OPTION has been changed in that the negative of a long option
    --OPTION is now --no-OPTION rather than --noOPTION.
 
+** Autotest testsuites may optionally provide colored test results.
+
 * Major changes in Autoconf 2.65 (2009-11-21) [stable]
   Released by Eric Blake, based on git versions 2.64.*.
 
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 1acf7d0..1e4ed01 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -23476,6 +23476,12 @@ Writing Testsuites
 several times.
 @end defmac
 
+...@defmac AT_COLOR_TESTS
+...@atindex{color_tests}
+Enable colored test results by default when the output is connected to
+a terminal.
+...@end defmac
+
 Autotest test suites rely on @env{PATH} to find the tested program.
 This avoids the need to generate absolute names of the various tools, and
 makes it possible to test installed programs.  Therefore, knowing which
@@ -23858,6 +23864,13 @@ testsuite Invocation
 Force more verbosity in the detailed output of what is being done.  This
 is the default for debugging scripts.
 
+...@item --color
+...@itemx --co...@r{[}=no@r{|}ne...@r{|}...@r{|}a...@r{|}alw...@r{]}
+Enable colored test results.  Test results are colored if the argument
+...@samp{always} is given, or if standard output is connected to a terminal
+and either the macro @code{AT_COLOR_TESTS} is used or the arguments
+...@samp{no} or @samp{never} are not given.
+
 @item --debug
 @itemx -d
 Do not remove the files after a test group was performed ---but they are
diff --git a/lib/autotest/general.m4 b/lib/autotest/general.m4
index 0bc529f..23bf145 100644
--- a/lib/autotest/general.m4
+++ b/lib/autotest/general.m4
@@ -423,6 +423,8 @@ m4_define([_AT_FINISH],
 [m4_ifdef([AT_ingroup], [m4_fatal([missing AT_CLEANUP detected])])dnl
 m4_divert_text([DEFAULTS],
 [
+# Whether to enable colored test results.
+at_color=m4_ifdef([AT_color], [AT_color], [no])
 # List of the tested programs.
 at_tested='m4_ifdef([AT_tested],
   [m4_translit(m4_dquote(m4_defn([AT_tested])), [ ], m4_newline)])'
@@ -492,6 +494,17 @@ do
        at_clean=:
        ;;
 
+    --color )
+       at_color=auto
+       ;;
+    --color=* )
+       case $at_optarg in
+       no | never) at_color=never ;;
+       yes | auto) at_color=auto ;;
+       always | *) at_color=always ;;
+       esac
+       ;;
+
     --debug | -d )
        at_debug_p=:
        ;;
@@ -663,6 +676,17 @@ else
   # Sort the tests, removing duplicates.
   at_groups=`AS_ECHO(["$at_groups"]) | tr ' ' "$as_nl" | sort -nu`
 fi
+
+if test x"$at_color" = xalways \
+   || { test x"$at_color" = xauto && test -t 1; }; then
+  at_red=`printf '\033@<:@0;31m'`
+  at_grn=`printf '\033@<:@0;32m'`
+  at_lgn=`printf '\033@<:@1;32m'`
+  at_blu=`printf '\033@<:@1;34m'`
+  at_std=`printf '\033@<:@m'`
+else
+  at_red= at_grn= at_lgn= at_blu= at_std=
+fi
 m4_divert_pop([PARSE_ARGS_END])dnl
 m4_divert_push([HELP])dnl
 
@@ -697,13 +721,17 @@ Operation modes:
   -l, --list     describes all the tests, or the selected TESTS
 _ATEOF
 m4_divert_pop([HELP_MODES])dnl
-m4_divert_push([HELP_TUNING])dnl
+m4_wrap([m4_divert_push([HELP_TUNING])dnl
 cat <<_ATEOF || at_write_fail=1
 
 dnl extra quoting prevents emacs whitespace mode from putting tabs in output
 Execution tuning:
   -C, --directory=DIR
 [                 change to directory DIR before starting]
+      --color[[=no|never|yes|auto|always]]
+[                 ]m4_ifdef([AT_color],
+                     [disable colored test results, or enable even without 
terminal],
+                     [enable colored test results on terminal, or always])
   -j, --jobs[[=N]]
 [                 Allow N jobs at once; infinite jobs with no arg (default 1)]
   -k, --keywords=KEYWORDS
@@ -717,7 +745,7 @@ Execution tuning:
 [                 default for debugging scripts]
   -x, --trace    enable tests shell tracing
 _ATEOF
-m4_divert_pop([HELP_TUNING])dnl
+m4_divert_pop([HELP_TUNING])])dnl
 m4_divert_push([HELP_END])dnl
 cat <<_ATEOF || at_write_fail=1
 
@@ -1156,35 +1184,40 @@ _ATEOF
        at_msg="UNEXPECTED PASS"
        at_res=xpass
        at_errexit=$at_errexit_p
+       at_color=$at_red
        ;;
     no:0)
        at_msg="ok"
        at_res=pass
        at_errexit=false
+       at_color=$at_grn
        ;;
     *:77)
        at_msg='skipped ('`cat "$at_check_line_file"`')'
        at_res=skip
        at_errexit=false
+       at_color=$at_blu
        ;;
     no:* | *:99)
        at_msg='FAILED ('`cat "$at_check_line_file"`')'
        at_res=fail
        at_errexit=$at_errexit_p
+       at_color=$at_red
        ;;
     yes:*)
        at_msg='expected failure ('`cat "$at_check_line_file"`')'
        at_res=xfail
        at_errexit=false
+       at_color=$at_lgn
        ;;
   esac
   echo "$at_res" > "$at_job_dir/$at_res"
   # In parallel mode, output the summary line only afterwards.
   if test $at_jobs -ne 1 && test -n "$at_verbose"; then
-    AS_ECHO(["$at_desc_line $at_msg"])
+    AS_ECHO(["$at_desc_line $at_color$at_msg$at_std"])
   else
     # Make sure there is a separator even with long titles.
-    AS_ECHO([" $at_msg"])
+    AS_ECHO([" $at_color$at_msg$at_std"])
   fi
   at_log_msg="$at_group. $at_desc ($at_setup_line): $at_msg"
   case $at_status in
@@ -1485,12 +1518,14 @@ if $at_errexit_p && test $at_unexpected_count != 0; then
     at_result="$at_result $at_were run, one failed"
   fi
   at_result="$at_result unexpectedly and inhibited subsequent tests."
+  at_color=$at_red
 else
   # Don't you just love exponential explosion of the number of cases?
+  at_color=$at_red
   case $at_xpass_count:$at_fail_count:$at_xfail_count in
     # So far, so good.
-    0:0:0) at_result="$at_result $at_were successful." ;;
-    0:0:*) at_result="$at_result behaved as expected." ;;
+    0:0:0) at_result="$at_result $at_were successful." at_color=$at_grn ;;
+    0:0:*) at_result="$at_result behaved as expected." at_color=$at_lgn ;;
 
     # Some unexpected failures
     0:*:0) at_result="$at_result $at_were run,
@@ -1538,10 +1573,10 @@ $at_skip_count tests were skipped." ;;
 esac
 
 if test $at_unexpected_count = 0; then
-  echo "$at_result"
+  echo "$at_color$at_result$at_std"
   echo "$at_result" >&AS_MESSAGE_LOG_FD
 else
-  echo "ERROR: $at_result" >&2
+  echo "${at_color}ERROR: $at_result$at_std" >&2
   echo "ERROR: $at_result" >&AS_MESSAGE_LOG_FD
   {
     echo
@@ -1757,6 +1792,12 @@ m4_define([AT_COPYRIGHT],
 [m4_default([$2], [m4_newline])([$1])])])# AT_COPYRIGHT
 
 
+# AT_COLOR_TESTS
+# --------------
+# Enable colored test results if standard error is connected to a terminal.
+m4_define([AT_COLOR_TESTS],
+[m4_define([AT_color], [auto])])
+
 # AT_SETUP(DESCRIPTION)
 # ---------------------
 # Start a group of related tests, all to be executed in the same subshell.
diff --git a/tests/autotest.at b/tests/autotest.at
index e09e189..fd3787a 100644
--- a/tests/autotest.at
+++ b/tests/autotest.at
@@ -1505,6 +1505,93 @@ AT_CHECK([test -s sigpipe-stamp || test ! -f 
micro-suite.dir/7/micro-suite.log],
 
 AT_CLEANUP
 
+
+# --color
+AT_CHECK_AT_TEST([colored test results],
+  [AT_CHECK([:])
+   AT_CLEANUP
+   AT_SETUP([fail])
+   AT_CHECK([exit 1])
+   AT_CLEANUP
+   AT_SETUP([xpass])
+   AT_XFAIL_IF([:])
+   AT_CHECK([:])
+   AT_CLEANUP
+   AT_SETUP([xfail])
+   AT_XFAIL_IF([:])
+   AT_CHECK([exit 1])
+   AT_CLEANUP
+   AT_SETUP([skip])
+   AT_CHECK([exit 77])
+   AT_CLEANUP
+   AT_SETUP([hardfail])
+   AT_XFAIL_IF([:])
+   AT_CHECK([exit 99])
+], [], [], [], [], [], [
+
+TERM=ansi
+export TERM
+
+red=`printf '\033@<:@0;31m'`
+grn=`printf '\033@<:@0;32m'`
+lgn=`printf '\033@<:@1;32m'`
+blu=`printf '\033@<:@1;34m'`
+std=`printf '\033@<:@m'`
+
+# Check that grep can parse nonprinting characters.
+# BSD 'grep' works from a pipe, but not a seekable file.
+# GNU or BSD 'grep -a' works on files, but is not portable.
+AT_CHECK([case `echo "$std" | grep .` in #'' restore font-lock
+           $std) :;;
+           *) Exit 77;;
+         esac], [], [ignore], [],
+        [echo "grep can't parse nonprinting characters" >&2])
+
+if echo 'ab*c' | grep -F 'ab*c' >/dev/null 2>&1; then
+  FGREP="grep -F"
+else
+  FGREP=fgrep
+fi
+
+# No color.
+AT_CHECK([$CONFIG_SHELL ./micro-suite], [1], [stdout], [stderr])
+for color in "$red" "$grn" "$lgn" "$blu"; do
+  AT_CHECK([cat stdout stderr | $FGREP "$color"], [1])
+done
+
+# Color of test group results.
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always], [1], [stdout], [stderr])
+AT_CHECK([cat stdout | grep " only " | $FGREP "$grn"], [], [ignore])
+AT_CHECK([cat stdout | grep " fail " | $FGREP "$red"], [], [ignore])
+AT_CHECK([cat stdout | grep " xfail " | $FGREP "$lgn"], [], [ignore])
+AT_CHECK([cat stdout | grep " xpass " | $FGREP "$red"], [], [ignore])
+AT_CHECK([cat stdout | grep " skip " | $FGREP "$blu"], [], [ignore])
+AT_CHECK([cat stdout | grep " hardfail " | $FGREP "$red"], [], [ignore])
+AT_CHECK([cat stderr | grep ERROR | $FGREP "$red"], [], [ignore])
+
+# The summary is green if all tests were successful, light green if all
+# behaved as expected, and red otherwise.
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always 1 -k skip],
+        [0], [stdout])
+AT_CHECK([cat stdout | grep 'test.*successful' | $FGREP "$grn"],
+        [], [ignore])
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always 1 -k xfail -k skip],
+        [0], [stdout])
+AT_CHECK([cat stdout | grep 'as expected' | $FGREP "$lgn"], [], [ignore])
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always -k fail],
+        [1], [ignore], [stderr])
+AT_CHECK([cat stderr | grep ERROR | $FGREP "$red"], [], [ignore])
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always -k xpass],
+        [1], [ignore], [stderr])
+AT_CHECK([cat stderr | grep ERROR | $FGREP "$red"], [], [ignore])
+AT_CHECK([$CONFIG_SHELL ./micro-suite --color=always -k hardfail],
+        [1], [ignore], [stderr])
+AT_CHECK([cat stderr | grep ERROR | $FGREP "$red"], [], [ignore])
+# Reset color on verbose output.
+printf %s\\n "$std"
+], [1])
+
+
 ## ------------------- ##
 ## srcdir propagation. ##
 ## ------------------- ##
diff --git a/tests/local.at b/tests/local.at
index a812c43..39360ef 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -25,6 +25,8 @@ m4_pattern_allow([^m4_(define|shift)$])
 # Programs this package provides
 AT_TESTED([autom4te autoconf autoheader autoupdate autoreconf ifnames])
 
+# Enable colored test output.
+AT_COLOR_TESTS
 
 ## ---------------- ##
 ## Utility macros.  ##

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