Add app detection package (#2647)

Add `appdetect`, a package that detects application projects on the filesystem by scanning files and applying heuristics. This involves only static analysis of files. 

This will be used to analyze emitted metadata about the projects to feed `azure.yaml` and infra generation.

Closes #2615

.vscode/cspell-github-user-aliases.txt

@@ -25,4 +25,5 @@ pbnj
 sethvargo
 stretchr
 theckman
+bmatcuk
 tonybaloney

cli/azd/.vscode/cspell-azd-dictionary.txt

@@ -5,11 +5,13 @@ alphafeatures
 apimanagement
 apims
 appconfiguration
+appdetect
 appinsights
 appinsightsexporter
 appinsightsstorage
 appplatform
 appservice
+arget
 armapimanagement
 armappconfiguration
 armappplatform
@@ -58,6 +60,7 @@ devel
 discarder
 docf
 dockerproject
+doublestar
 dskip
 eastus
 endregion
@@ -81,6 +84,7 @@ hotspot
 iidfile
 ineffassign
 javac
+jquery
 jmes
 keychain
 LASTEXITCODE
@@ -92,6 +96,8 @@ microsoftonline
 mockarmresources
 mockazcli
 mvnw
+mysqldb
+mysqlclient
 nobanner
 nodeapp
 nolint
@@ -110,8 +116,10 @@ otlptracehttp
 pflag
 preinit
 proxying
+psycopg
 pulumi
 pyapp
+pyproject
 pyvenv
 reauthentication
 relogin
@@ -126,6 +134,7 @@ servicebus
 setenvs
 snapshotter
 springapp
+sqlserver
 sstore
 staticcheck
 staticwebapp
@@ -147,6 +156,7 @@ unmarshalling
 unsetenvs
 unsets
 utsname
+vuejs
 westus2
 wireinject
 yacspin

cli/azd/appdetect/.gitignore

@@ -0,0 +1 @@
+appdetect

cli/azd/appdetect/main.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/azure/azure-dev/cli/azd/internal/appdetect"
+)
+
+var directory string
+var projectDirectory string
+
+func init() {
+	flag.StringVar(&directory, "dir", "", "Directory containing projects to detect")
+	flag.StringVar(&projectDirectory, "proj", "", "Specific project directory to detect")
+}
+
+func main() {
+	flag.Parse()
+
+	if directory == "" && projectDirectory == "" {
+		fmt.Println("must set one of 'proj', or 'dir'")
+		os.Exit(1)
+	}
+
+	var projects []appdetect.Project
+	var err error
+
+	if directory != "" {
+		projects, err = appdetect.Detect(directory)
+	}
+
+	if projectDirectory != "" {
+		var project *appdetect.Project
+		project, err = appdetect.DetectDirectory(projectDirectory)
+
+		if err == nil && project != nil {
+			projects = append(projects, *project)
+		}
+	}
+
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Projects detected:")
+	content, err := json.Marshal(projects)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("%v\n", string(content))
+}