hg diff [OPTION]... ([-c REV] | [-r REV1 [-r REV2]]) [FILE]...

diff repository (or selected files)

    Show differences between revisions for the specified files.

    Differences between files are shown using the unified diff format.

    Note:
       diff may generate unexpected results for merges, as it will default to
       comparing against the working directory's first parent changeset if no
       revisions are specified.

    When two revision arguments are given, then changes are shown between
    those revisions. If only one revision is specified then that revision is
    compared to the working directory, and, when no revisions are specified,
    the working directory files are compared to its parent.

    Alternatively you can specify -c/--change with a revision to see the
    changes in that changeset relative to its first parent.

    Without the -a/--text option, diff will avoid generating diffs of files it
    detects as binary. With -a, diff will generate a diff anyway, probably
    with undesirable results.

    Use the -g/--git option to generate diffs in the git extended diff format.
    For more information, read "hg help diffs".

    Returns 0 on success.

options:

 -r --rev REV [+]          revision
 -c --change REV           change made by revision
 -a --text                 treat all files as text
 -g --git                  use git extended diff format
    --nodates              omit dates from diff headers
 -p --show-function        show which function each change is in
    --reverse              produce a diff that undoes the changes
 -w --ignore-all-space     ignore white space when comparing lines
 -b --ignore-space-change  ignore changes in the amount of white space
 -B --ignore-blank-lines   ignore changes whose lines are all blank
 -U --unified NUM          number of lines of context to show
    --stat                 output diffstat-style summary of changes
 -I --include PATTERN [+]  include names matching the given patterns
 -X --exclude PATTERN [+]  exclude names matching the given patterns
 -S --subrepos             recurse into subrepositories

[+] marked option can be specified multiple times

use "hg -v help diff" to show global options