diff -r d3c4368099ed -r 2e017696181f mercurial/help/environment.txt
--- a/mercurial/help/environment.txt	Thu Nov 14 11:33:05 2019 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,121 +0,0 @@
-HG
-    Path to the 'hg' executable, automatically passed when running
-    hooks, extensions or external tools. If unset or empty, this is
-    the hg executable's name if it's frozen, or an executable named
-    'hg' (with %PATHEXT% [defaulting to COM/EXE/BAT/CMD] extensions on
-    Windows) is searched.
-
-HGEDITOR
-    This is the name of the editor to run when committing. See EDITOR.
-
-    (deprecated, see :hg:`help config.ui.editor`)
-
-HGENCODING
-    This overrides the default locale setting detected by Mercurial.
-    This setting is used to convert data including usernames,
-    changeset descriptions, tag names, and branches. This setting can
-    be overridden with the --encoding command-line option.
-
-HGENCODINGMODE
-    This sets Mercurial's behavior for handling unknown characters
-    while transcoding user input. The default is "strict", which
-    causes Mercurial to abort if it can't map a character. Other
-    settings include "replace", which replaces unknown characters, and
-    "ignore", which drops them. This setting can be overridden with
-    the --encodingmode command-line option.
-
-HGENCODINGAMBIGUOUS
-    This sets Mercurial's behavior for handling characters with
-    "ambiguous" widths like accented Latin characters with East Asian
-    fonts. By default, Mercurial assumes ambiguous characters are
-    narrow, set this variable to "wide" if such characters cause
-    formatting problems.
-
-HGMERGE
-    An executable to use for resolving merge conflicts. The program
-    will be executed with three arguments: local file, remote file,
-    ancestor file.
-
-    (deprecated, see :hg:`help config.ui.merge`)
-
-HGRCPATH
-    A list of files or directories to search for configuration
-    files. Item separator is ":" on Unix, ";" on Windows. If HGRCPATH
-    is not set, platform default search path is used. If empty, only
-    the .hg/hgrc from the current repository is read.
-
-    For each element in HGRCPATH:
-
-    - if it's a directory, all files ending with .rc are added
-    - otherwise, the file itself will be added
-
-HGPLAIN
-    When set, this disables any configuration settings that might
-    change Mercurial's default output. This includes encoding,
-    defaults, verbose mode, debug mode, quiet mode, tracebacks, and
-    localization. This can be useful when scripting against Mercurial
-    in the face of existing user configuration.
-
-    In addition to the features disabled by ``HGPLAIN=``, the following
-    values can be specified to adjust behavior:
-
-    ``+strictflags``
-        Restrict parsing of command line flags.
-
-    Equivalent options set via command line flags or environment
-    variables are not overridden.
-
-    See :hg:`help scripting` for details.
-
-HGPLAINEXCEPT
-    This is a comma-separated list of features to preserve when
-    HGPLAIN is enabled. Currently the following values are supported:
-
-    ``alias``
-        Don't remove aliases.
-    ``color``
-        Don't disable colored output.
-    ``i18n``
-        Preserve internationalization.
-    ``revsetalias``
-        Don't remove revset aliases.
-    ``templatealias``
-        Don't remove template aliases.
-    ``progress``
-        Don't hide progress output.
-
-    Setting HGPLAINEXCEPT to anything (even an empty string) will
-    enable plain mode.
-
-HGUSER
-    This is the string used as the author of a commit. If not set,
-    available values will be considered in this order:
-
-    - HGUSER (deprecated)
-    - configuration files from the HGRCPATH
-    - EMAIL
-    - interactive prompt
-    - LOGNAME (with ``@hostname`` appended)
-
-    (deprecated, see :hg:`help config.ui.username`)
-
-EMAIL
-    May be used as the author of a commit; see HGUSER.
-
-LOGNAME
-    May be used as the author of a commit; see HGUSER.
-
-VISUAL
-    This is the name of the editor to use when committing. See EDITOR.
-
-EDITOR
-    Sometimes Mercurial needs to open a text file in an editor for a
-    user to modify, for example when writing commit messages. The
-    editor it uses is determined by looking at the environment
-    variables HGEDITOR, VISUAL and EDITOR, in that order. The first
-    non-empty one is chosen. If all of them are empty, the editor
-    defaults to 'vi'.
-
-PYTHONPATH
-    This is used by Python to find imported modules and may need to be
-    set appropriately if this Mercurial is not installed system-wide.