go package graph

本意是用于将 golang 标准库的 package 间依赖关系用 dot 语言描述，实际使用时发现，生成的图片中依赖关系太多而无法作用于大规模的 go 包，对于小规模的有一定的参考意义。

示例：

1. bytes

   $ go run main.go -p ${GOROOT}/src/bytes | tee bytes.dot | dot -T png >bytes.png && cat bytes.dot
   digraph bytes {
   node [shape=box];
   1 [label="bytes"];
   2 [label="errors"];
   3 [label="internal/bytealg"];
   4 [label="io"];
   5 [label="unicode"];
   6 [label="unicode/utf8"];
   1 -> 2;
   1 -> 3;
   1 -> 4;
   1 -> 5;
   1 -> 6;
   }

   图片输出:

   

2. database

   go run main.go -p ${GOROOT}/src/database | tee db.dot | dot -T png >db.png && cat db.dot   
   digraph database {
   node [shape=box];
   2 [label="context"];
   1 [label="database/sql"];
   3 [label="database/sql/driver"];
   4 [label="errors"];
   5 [label="fmt"];
   6 [label="io"];
   7 [label="reflect"];
   8 [label="runtime"];
   9 [label="sort"];
   10 [label="strconv"];
   11 [label="sync"];
   12 [label="sync/atomic"];
   13 [label="time"];
   14 [label="unicode"];
   15 [label="unicode/utf8"];
   1 -> 2;
   1 -> 3;
   1 -> 4;
   1 -> 5;
   1 -> 6;
   1 -> 7;
   1 -> 8;
   1 -> 9;
   1 -> 10;
   1 -> 11;
   1 -> 12;
   1 -> 13;
   1 -> 14;
   1 -> 15;
   3 -> 2;
   3 -> 4;
   3 -> 5;
   3 -> 7;
   3 -> 10;
   3 -> 13;
   }

   图片输出: