105 

   106 Status message redirection:

   107 

   108   $ hg init empty

   109 

   110  status messages are sent to stdout by default:

   111 

   112   $ hg outgoing -R t empty -Tjson 2>/dev/null

   113   comparing with empty

   114   searching for changes

   115   [

   116    {

   117     "bookmarks": [],

   118     "branch": "default",

   119     "date": [0, 0],

   120     "desc": "test",

   121     "node": "acb14030fe0a21b60322c440ad2d20cf7685a376",

   122     "parents": ["0000000000000000000000000000000000000000"],

   123     "phase": "draft",

   124     "rev": 0,

   125     "tags": ["tip"],

   126     "user": "test"

   127    }

   128   ]

   129 

   130  which can be configured to send to stderr, so the output wouldn't be

   131  interleaved:

   132 

   133   $ cat <<'EOF' >> "$HGRCPATH"

   134   > [ui]

   135   > message-output = stderr

   136   > EOF

   137   $ hg outgoing -R t empty -Tjson 2>/dev/null

   138   [

   139    {

   140     "bookmarks": [],

   141     "branch": "default",

   142     "date": [0, 0],

   143     "desc": "test",

   144     "node": "acb14030fe0a21b60322c440ad2d20cf7685a376",

   145     "parents": ["0000000000000000000000000000000000000000"],

   146     "phase": "draft",

   147     "rev": 0,

   148     "tags": ["tip"],

   149     "user": "test"

   150    }

   151   ]

   152   $ hg outgoing -R t empty -Tjson >/dev/null

   153   comparing with empty

   154   searching for changes

   155 

   156  this option should be turned off by HGPLAIN= since it may break scripting use:

   157 

   158   $ HGPLAIN= hg outgoing -R t empty -Tjson 2>/dev/null

   159   comparing with empty

   160   searching for changes

   161   [

   162    {

   163     "bookmarks": [],

   164     "branch": "default",

   165     "date": [0, 0],

   166     "desc": "test",

   167     "node": "acb14030fe0a21b60322c440ad2d20cf7685a376",

   168     "parents": ["0000000000000000000000000000000000000000"],

   169     "phase": "draft",

   170     "rev": 0,

   171     "tags": ["tip"],

   172     "user": "test"

   173    }

   174   ]

   175 

   176  but still overridden by --config:

   177 

   178   $ HGPLAIN= hg outgoing -R t empty -Tjson --config ui.message-output=stderr \

   179   > 2>/dev/null

   180   [

   181    {

   182     "bookmarks": [],

   183     "branch": "default",

   184     "date": [0, 0],

   185     "desc": "test",

   186     "node": "acb14030fe0a21b60322c440ad2d20cf7685a376",

   187     "parents": ["0000000000000000000000000000000000000000"],

   188     "phase": "draft",

   189     "rev": 0,

   190     "tags": ["tip"],

   191     "user": "test"

   192    }

   193   ]

   194 

   195 Invalid ui.message-output option:

   196 

   197   $ hg log -R t --config ui.message-output=bad

   198   abort: invalid ui.message-output destination: bad

   199   [255]

   200 

   201 Underlying message streams should be updated when ui.fout/ferr are set:

   202 

   203   $ cat <<'EOF' > capui.py

   204   > from mercurial import pycompat, registrar

   205   > cmdtable = {}

   206   > command = registrar.command(cmdtable)

   207   > @command(b'capui', norepo=True)

   208   > def capui(ui):

   209   >     out = ui.fout

   210   >     ui.fout = pycompat.bytesio()

   211   >     ui.status(b'status\n')

   212   >     ui.ferr = pycompat.bytesio()

   213   >     ui.warn(b'warn\n')

   214   >     out.write(b'stdout: %s' % ui.fout.getvalue())

   215   >     out.write(b'stderr: %s' % ui.ferr.getvalue())

   216   > EOF

   217   $ hg --config extensions.capui=capui.py --config ui.message-output=stdio capui

   218   stdout: status

   219   stderr: warn