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ce49dd6080
When you specify `-verbose` you'll get the whole graph of operations,
which gives a better idea of the operations terraform performs and in
what order.
The DOT graph is now generated with a small internal library instead of
simple string building. This allows us to ensure the graph generation is
as consistent as possible, among other benefits.
We set `newrank = true` in the graph, which I've found does just as good
a job organizing things visually as manually attempting to rank the nodes
based on depth.
This also fixes `-module-depth`, which was broken post-AST refector.
Modules are now expanded into subgraphs with labels and borders. We
have yet to regain the plan graphing functionality, so I removed that
from the docs for now.
Finally, if `-draw-cycles` is added, extra colored edges will be drawn
to indicate the path of any cycles detected in the graph.
A notable implementation change included here is that
{Reverse,}DepthFirstWalk has been made deterministic. (Before it was
dependent on `map` ordering.) This turned out to be unnecessary to gain
determinism in the final DOT-level implementation, but it seemed
a desirable enough of a property that I left it in.
48 lines
853 B
Go
48 lines
853 B
Go
package dot
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import (
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"bytes"
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"fmt"
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)
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// graphWriter wraps a bytes.Buffer and tracks indent level levels.
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type graphWriter struct {
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bytes.Buffer
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indent int
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indentStr string
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}
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// Returns an initialized graphWriter at indent level 0.
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func newGraphWriter() *graphWriter {
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w := &graphWriter{
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indent: 0,
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}
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w.init()
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return w
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}
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// Prints to the buffer at the current indent level.
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func (w *graphWriter) Printf(s string, args ...interface{}) {
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w.WriteString(w.indentStr + fmt.Sprintf(s, args...))
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}
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// Increase the indent level.
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func (w *graphWriter) Indent() {
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w.indent++
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w.init()
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}
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// Decrease the indent level.
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func (w *graphWriter) Unindent() {
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w.indent--
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w.init()
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}
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func (w *graphWriter) init() {
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indentBuf := new(bytes.Buffer)
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for i := 0; i < w.indent; i++ {
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indentBuf.WriteString("\t")
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}
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w.indentStr = indentBuf.String()
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}
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