From 9adbaf69eed2c38792853ca4902ce0a718253f93 Mon Sep 17 00:00:00 2001
From: webmin <wu.diablo@gmail.com>
Date: Thu, 5 Mar 2020 14:16:53 +0800
Subject: [PATCH] add golang demo

---
 demo/golang/.vscode/launch.json | 21 ++++++++
 demo/golang/demo.go             | 91 +++++++++++++++++++++++++++++++++
 demo/golang/go.mod              |  3 ++
 3 files changed, 115 insertions(+)
 create mode 100644 demo/golang/.vscode/launch.json
 create mode 100644 demo/golang/demo.go
 create mode 100644 demo/golang/go.mod

diff --git a/demo/golang/.vscode/launch.json b/demo/golang/.vscode/launch.json
new file mode 100644
index 0000000..a43be50
--- /dev/null
+++ b/demo/golang/.vscode/launch.json
@@ -0,0 +1,21 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}",
+            "env": {},
+            "args": [],
+            "dlvLoadConfig": {
+                "followPointers": true,
+                "maxVariableRecurse": 1,
+                "maxStringLen": 5000,
+                "maxArrayValues": 64,
+                "maxStructFields": -1
+            }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/demo/golang/demo.go b/demo/golang/demo.go
new file mode 100644
index 0000000..2cfecc7
--- /dev/null
+++ b/demo/golang/demo.go
@@ -0,0 +1,91 @@
+package main
+
+import (
+	"encoding/json"
+	"math/rand"
+	"strconv"
+	"time"
+)
+
+// Debug using Delve needs to adjust the configuration
+// Delve's maxStringLen default is small and needs to be adjusted for the maxStringLen default of the delve. See in detail (microsoft/vscode-go#868).
+// Add the following configuration to
+//launch.json
+// "dlvLoadConfig": {
+//                 "followPointers": true,
+//                 "maxVariableRecurse": 1,
+//                 "maxStringLen": 5000,
+//                 "maxArrayValues": 64,
+//                 "maxStructFields": -1
+//             }
+
+// debuging test Must be set settings.json
+//settings.json
+// "go.delveConfig": {
+//     "dlvLoadConfig": {
+//         "followPointers": true,
+//         "maxVariableRecurse": 1,
+//         "maxStringLen": 5000,
+//         "maxArrayValues": 64,
+//         "maxStructFields": -1
+//     },
+//     "apiVersion": 2,
+//     "showGlobalVariables": true
+// }
+
+type Graph struct {
+	Kind  map[string]bool `json:"kind"`
+	Nodes []NodeGraphData `json:"nodes"`
+	Edges []EdgeGraphData `json:"edges"`
+}
+
+type NodeGraphData struct {
+	ID    string `json:"id"`
+	Label string `json:"label,omitempty"`
+	Color string `json:"color,omitempty"`
+	Shape string `json:"shape,omitempty"`
+}
+
+type EdgeGraphData struct {
+	From   string `json:"from"`
+	To     string `json:"to"`
+	Label  string `json:"label,omitempty"`
+	ID     string `json:"id"`
+	Color  string `json:"color,omitempty"`
+	Dashes bool   `json:"dashes,omitempty"`
+}
+
+func NewGraph() *Graph {
+	return &Graph{
+		Kind:  map[string]bool{"graph": true},
+		Nodes: []NodeGraphData{},
+		Edges: []EdgeGraphData{},
+	}
+}
+
+func (this *Graph) toString() string {
+	rs, _ := json.Marshal(this)
+	return string(rs)
+}
+
+// Visualize "s"
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	graph := NewGraph()
+	var s string
+	for i := 2; i < 100; i++ {
+		id := strconv.Itoa(i)
+		graph.Nodes = append(graph.Nodes, NodeGraphData{
+			ID:    id,
+			Label: id,
+		})
+		targetId := rand.Intn(i) + 1
+		graph.Edges = append(graph.Edges, EdgeGraphData{
+			From: id,
+			To:   strconv.Itoa(targetId),
+		})
+		s = graph.toString()
+		_ = s
+		//fmt.Printf("%s", s)
+	}
+}
diff --git a/demo/golang/go.mod b/demo/golang/go.mod
new file mode 100644
index 0000000..7d7d334
--- /dev/null
+++ b/demo/golang/go.mod
@@ -0,0 +1,3 @@
+module demo
+
+go 1.13