# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1612994634 -3600
# Node ID b910be772eb9bc0b62bd3bc421a2084d3ac72c9f
# Parent  7289eac777eca454dbc08f2c0cbe1b368b1b2ae1
hooks: add a `auto` value for `hooks.*run-with-plain`

That setting restore the behavior pre-5.6. The current HGPLAIN value is simply
passed to the hooks.

This allow user who needs it to fully mitigate the behavior change introduced
in Mercurial 5.7 by restoring the older behavior.

Differential Revision: https://phab.mercurial-scm.org/D9982

diff -r 7289eac777ec -r b910be772eb9 mercurial/helptext/config.txt
--- a/mercurial/helptext/config.txt	Wed Feb 10 23:21:21 2021 +0100
+++ b/mercurial/helptext/config.txt	Wed Feb 10 23:03:54 2021 +0100
@@ -1032,6 +1032,8 @@
   incoming.autobuild:run-with-plain = yes
   # HGPLAIN never set
   incoming.autobuild:run-with-plain = no
+  # HGPLAIN inherited from environment (default before Mercurila 5.7)
+  incoming.autobuild:run-with-plain = auto
 
 Most hooks are run with environment variables set that give useful
 additional information. For each hook below, the environment variables
diff -r 7289eac777ec -r b910be772eb9 mercurial/hook.py
--- a/mercurial/hook.py	Wed Feb 10 23:21:21 2021 +0100
+++ b/mercurial/hook.py	Wed Feb 10 23:03:54 2021 +0100
@@ -158,7 +158,10 @@
     env[b'HG_HOOKTYPE'] = htype
     env[b'HG_HOOKNAME'] = name
 
-    plain = ui.configbool(b'hooks', b'%s:run-with-plain' % name)
+    if ui.config(b'hooks', b'%s:run-with-plain' % name) == b'auto':
+        plain = ui.plain()
+    else:
+        plain = ui.configbool(b'hooks', b'%s:run-with-plain' % name)
     if plain:
         env[b'HGPLAIN'] = b'1'
     else:
diff -r 7289eac777ec -r b910be772eb9 tests/test-hook.t
--- a/tests/test-hook.t	Wed Feb 10 23:21:21 2021 +0100
+++ b/tests/test-hook.t	Wed Feb 10 23:03:54 2021 +0100
@@ -1412,16 +1412,20 @@
   > pre-version.testing-yes:run-with-plain=yes
   > pre-version.testing-no=echo '### no ########' plain: \${HGPLAIN:-'<unset>'}
   > pre-version.testing-no:run-with-plain=no
+  > pre-version.testing-auto=echo '### auto ######' plain: \${HGPLAIN:-'<unset>'}
+  > pre-version.testing-auto:run-with-plain=auto
   > EOF
 
   $ (unset HGPLAIN; hg version --quiet)
   ### default ### plain: 1
   ### yes ####### plain: 1
   ### no ######## plain: <unset>
+  ### auto ###### plain: <unset>
   Mercurial Distributed SCM (*) (glob)
 
   $ HGPLAIN=1 hg version --quiet
   ### default ### plain: 1
   ### yes ####### plain: 1
   ### no ######## plain: <unset>
+  ### auto ###### plain: 1
   Mercurial Distributed SCM (*) (glob)