[PATCH] debuginstall: add a line about re2 availability

[Boris Feld]

# HG changeset patch
# User Boris Feld <boris.feld at octobus.net>
# Date 1511826516 18000
#      Mon Nov 27 18:48:36 2017 -0500
# Node ID dfade8ee7beafb4c6c8eecfdf54b301dba0ecaf1
# Parent  8287df8b7be545fdafa22b771012ac65f6264d12
# EXP-Topic debugpyre2
# Available At https://bitbucket.org/octobus/mercurial-devel/
#              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r dfade8ee7bea
debuginstall: add a line about re2 availability

Using re2 engine can massively speed up regexp. We make it simpler to check if
it is available in a given install.

diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -1120,6 +1120,10 @@ def debuginstall(ui, **opts):
              fm.formatlist([e.name() for e in wirecompengines
                             if e.wireprotosupport()],
                            name='compengine', fmt='%s', sep=', '))
+    re2 = 'missing'
+    if util._re2:
+        re2 = 'available'
+    fm.write('regextre2', _('checking "re2" regexp engine (%s)\n'), re2)
 
     # templates
     p = templater.templatepaths()
diff --git a/tests/test-install.t b/tests/test-install.t
--- a/tests/test-install.t
+++ b/tests/test-install.t
@@ -14,6 +14,7 @@ hg debuginstall
   checking registered compression engines (*zlib*) (glob)
   checking available compression engines (*zlib*) (glob)
   checking available compression engines for wire protocol (*zlib*) (glob)
+  checking "re2" regexp engine \((available|missing)\) (re)
   checking templates (*mercurial?templates)... (glob)
   checking default template (*mercurial?templates?map-cmdline.default) (glob)
   checking commit editor... (* -c "import sys; sys.exit(0)") (glob)
@@ -44,6 +45,7 @@ hg debuginstall JSON
     "pythonlib": "*", (glob)
     "pythonsecurity": [*], (glob)
     "pythonver": "*.*.*", (glob)
+    "regextre2": "(available|missing)", (re)
     "templatedirs": "*mercurial?templates", (glob)
     "username": "test",
     "usernameerror": null,
@@ -67,6 +69,7 @@ hg debuginstall with no username
   checking registered compression engines (*zlib*) (glob)
   checking available compression engines (*zlib*) (glob)
   checking available compression engines for wire protocol (*zlib*) (glob)
+  checking "re2" regexp engine \((available|missing)\) (re)
   checking templates (*mercurial?templates)... (glob)
   checking default template (*mercurial?templates?map-cmdline.default) (glob)
   checking commit editor... (* -c "import sys; sys.exit(0)") (glob)
@@ -110,6 +113,7 @@ path variables are expanded (~ is the sa
   checking registered compression engines (*zlib*) (glob)
   checking available compression engines (*zlib*) (glob)
   checking available compression engines for wire protocol (*zlib*) (glob)
+  checking "re2" regexp engine \((available|missing)\) (re)
   checking templates (*mercurial?templates)... (glob)
   checking default template (*mercurial?templates?map-cmdline.default) (glob)
   checking commit editor... (* -c "import sys; sys.exit(0)") (glob)
@@ -217,6 +221,7 @@ since it's bin on most platforms but Scr
   checking registered compression engines (*) (glob)
   checking available compression engines (*) (glob)
   checking available compression engines for wire protocol (*) (glob)
+  checking "re2" regexp engine \((available|missing)\) (re)
   checking templates ($TESTTMP/installenv/*/site-packages/mercurial/templates)... (glob)
   checking default template ($TESTTMP/installenv/*/site-packages/mercurial/templates/map-cmdline.default) (glob)
   checking commit editor... (*) (glob)