6b4fa21074
This is still a dirty prototype, so please excuse the mess. Please excuse the fact that this is a mega patch. Once things settle down this won't happen any more. Some of the changes squashed into here include: * Merge vertex loop with type loop (The file watcher seems to cache events anyways) * Improve pgraph library * Add indegree, outdegree, and topological sort with tests * Add reverse function for vertex list * Tons of additional cleanup! Amazingly, on my first successful compile, this seemed to run! A special thanks to Ira Cooper who helped me talk through some of the algorithmic decisions and for his help in finding better ones!
102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
// Mgmt
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// Copyright (C) 2013-2015+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"bytes"
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"encoding/base64"
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"encoding/gob"
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"path"
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"strings"
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)
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// Similar to the GNU dirname command
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func Dirname(p string) string {
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d, _ := path.Split(path.Clean(p))
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return d
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}
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// Split a path into an array of tokens excluding any trailing empty tokens
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func PathSplit(p string) []string {
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return strings.Split(path.Clean(p), "/")
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}
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// Does path string contain the given path prefix in it?
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func HasPathPrefix(p, prefix string) bool {
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patharray := PathSplit(p)
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prefixarray := PathSplit(prefix)
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if len(prefixarray) > len(patharray) {
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return false
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}
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for i := 0; i < len(prefixarray); i++ {
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if prefixarray[i] != patharray[i] {
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return false
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}
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}
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return true
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}
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// Delta of path prefix, tells you how many path tokens different the prefix is
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func PathPrefixDelta(p, prefix string) int {
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if !HasPathPrefix(p, prefix) {
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return -1
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}
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patharray := PathSplit(p)
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prefixarray := PathSplit(prefix)
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return len(patharray) - len(prefixarray)
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}
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func PathIsDir(p string) bool {
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return p[len(p)-1:] == "/" // a dir has a trailing slash in this context
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}
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// encode an object as base 64, serialize and then base64 encode
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func ObjToB64(obj interface{}) (string, bool) {
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b := bytes.Buffer{}
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e := gob.NewEncoder(&b)
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err := e.Encode(obj)
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if err != nil {
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//log.Println("Gob failed to Encode: ", err)
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return "", false
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}
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return base64.StdEncoding.EncodeToString(b.Bytes()), true
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}
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// TODO: is it possible to somehow generically just return the obj?
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// decode an object into the waiting obj which you pass a reference to
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func B64ToObj(str string, obj interface{}) bool {
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bb, err := base64.StdEncoding.DecodeString(str)
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if err != nil {
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//log.Println("Base64 failed to Decode: ", err)
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return false
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}
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b := bytes.NewBuffer(bb)
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d := gob.NewDecoder(b)
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err = d.Decode(obj)
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if err != nil {
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//log.Println("Gob failed to Decode: ", err)
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return false
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}
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return true
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}
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