usage: dependencies.py [-h] [-v] [-f {gcc-minus-h,cmake}] [-r ROOT]
                       [-s SUFFIX] [-o FILE] [--strip-prefix PREFIX]
                       [--verbose] [--filter-contract-directories]
                       [--filter-drop-absolute-paths] [--filter-drop-loops]
                       [--filter-source REGEX] [--filter-target REGEX]
                       [--filter-source-and-target REGEX]
                       [--filter-drop-source REGEX]
                       [--filter-drop-target REGEX]
                       [--filter-drop-source-and-target REGEX]
                       [--filter-dependencies REGEX]
                       [--filter-reverse-dependencies REGEX]
                       [--filter-generic LAMBDA]

optional arguments:
  -h, --help            show this help message and exit
  -v, --version         show program's version number and exit
  -f {gcc-minus-h,cmake}, --format {gcc-minus-h,cmake}
                        The format of the dependency information, either "gcc-
                        minus-h" or "cmake" (default: "gcc-minus-h").
  -r ROOT, --root ROOT  The root of the subtree with dependency information
                        (default: ".").
  -s SUFFIX, --suffix SUFFIX
                        The suffix of the files with dependency information
                        (default: ".d"). Use "depend.make" for cmake
                        dependency format.
  -o FILE, --output FILE
                        The output is written to this file (default: stdout).
  --strip-prefix PREFIX
                        Strips PREFIX from all filenames if matching. The root
                        directory is always stripped. Useful for out-of-source
                        builds or weird automounters. Can be given multiple
                        times. The prefixes are tried in the order of their
                        appearance on the command line. The first match
                        (except the root directory) stops processing of the
                        remaining prefixes.
  --verbose             Enables the verbose mode.

Filter options:
  The following options control filters to postprocess the dependency graph.
  All filter options can be given multiple times and are applied in the
  order of their appearance on the command line.

  --filter-contract-directories
                        Replaces all nodes representing files in a particular
                        directory by a single node for that directory.
  --filter-drop-absolute-paths
                        Removes all nodes representing files with an absolute
                        path.
  --filter-drop-loops   Removes all loops, i.e., edges where source and target
                        are equal.
  --filter-source REGEX
                        Removes all edges with sources not matching REGEX.
  --filter-target REGEX
                        Removes all edges with targets not matching REGEX.
  --filter-source-and-target REGEX
                        Removes all edges with sources and targets not
                        matching REGEX.
  --filter-drop-source REGEX
                        Removes all edges with sources matching REGEX.
  --filter-drop-target REGEX
                        Removes all edges with targets matching REGEX.
  --filter-drop-source-and-target REGEX
                        Removes all edges with sources and targets matching
                        REGEX.
  --filter-dependencies REGEX
                        Removes all nodes not reachable from nodes matching
                        REGEX by a forward graph traversal, i.e., only the
                        dependencies of nodes matching REGEX remain.
  --filter-reverse-dependencies REGEX
                        Removes all nodes not reachable from nodes matching
                        REGEX by a backward graph traversal, i.e., only the
                        nodes depending on nodes matching REGEX remain.
  --filter-generic LAMBDA
                        Applies the given lambda function to all edges of the
                        graph. The lambda function must accept two string
                        arguments. It is called for all edges with the source
                        and target nodes as arguments. It must return None,
                        which removes the edge, or a pair of two strings. In
                        the latter case, this pair is interpreted as new
                        source and target node of the edge. For example,
                        "lambda s, t: (t, s)" reverts the direction of all
                        edges.