gotypegraph

Generate definitions and references graph.

Usage

❯ gotypegraph -h
Usage of gotypegraph:
  gotypegraph [flags] -type TYPE patterns...
Flags:
  -accept.name string
        Accept objects whose name matches this.
  -accept.pkg string
        Accept packages whose name matches this.
  -buffer int
        Size of search buffers. (default 1000)
  -deny.name string
        Deny objects whose name matches this.
  -deny.pkg string
        Deny packages whose name matches this.
  -fontsize.max int
        Max fontsize used for text in dot. (default 24)
  -fontsize.min int
        Min fontsize used for text in dot. (default 8)
  -foreign
        Search definitions in foreign packages.
  -log.regexp string
        Regexp to grep logs.
  -noselfloop
        Ignore self references.
  -penwidth.max int
        Max penwidth used to draw lines in dot. (default 1)
  -penwidth.min int
        Min penwidth used to draw lines in dot. (default 1)
  -private
        Search private definitions.
  -quiet
        Quiet logs.
  -stat
        Generate stat graph when type is dot.
  -type string
        Output format. json or dot. (default "dot")
  -universe
        Search definitions in builtin packages.
  -v string
        Logging verbosity. quiet, error, warn, info, verbose or debug. (default "info")
  -weight.max int
        Max weight for dot. (default 100)
  -weight.min int
        Min weight for dot. (default 1)
  -worker int
        Number of search workers. (default 4)

Example

Use graphviz.

❯ gotypegraph ./... > /tmp/example.dot
❯ dot -Tsvg /tmp/example.dot -o /tmp/example.svg

A gray region is a package.

An arrow is a dependency, the arrow's tail is the reference and the arrow's head is the definition.
The arrow's label is the count of the same dependency (no label means 1).

A square region in a package is a definition, func, var, etc.
Ref is the number of times it refers the other definitions.
Def is the number of times it is referred by the other definitions.
UniqRef is the unique Ref, UniqRef is the unique Def.
RefDef is Ref + Def.

Emphasized arrows and definitions have many dependencies.

On mouseover, an arrow and a definition displays additional information,
an arrow displays the tail and the head, a definition displays dependencies in lines.

Generate graph with -stat:

❯ gotypegraph -stat ./... > /tmp/example_stat.dot
❯ dot -Tsvg /tmp/example_stat.dot -o /tmp/example_stat.svg

The graph displays dependencies aggregated by package.