Improve AUR with AUR dependency installations

pkg/fetch/alpm/alpm.go

@@ -37,6 +37,14 @@ func (h *Handle) LocalPackages() (map[string]dyalpm.Package, error) {
 	return localPkgs, nil
 }
 
+func (h *Handle) FindProvidingPackage(depName string) (string, bool) {
+	pkg := h.handle.FindDBSatisfier(h.syncDBs, depName)
+	if pkg != nil {
+		return pkg.Name(), true
+	}
+	return "", false
+}
+
 func (h *Handle) Release() error {
 	if h.handle != nil {
 		h.handle.Release()

pkg/fetch/aur/aur.go

@@ -13,10 +13,16 @@ import (
 var AURInfoURL = "https://aur.archlinux.org/rpc?v=5&type=info"
 
 type Package struct {
-	Name        string `json:"Name"`
-	PackageBase string `json:"PackageBase"`
-	Version     string `json:"Version"`
-	URL         string `json:"URL"`
+	Name        string   `json:"Name"`
+	PackageBase string   `json:"PackageBase"`
+	Version     string   `json:"Version"`
+	URL         string   `json:"URL"`
+	Depends     []string `json:"Depends"`
+	MakeDepends []string `json:"MakeDepends"`
+}
+
+func (p Package) AllDepends() []string {
+	return append(p.Depends, p.MakeDepends...)
 }
 
 type Response struct {

pkg/fetch/fetch.go

@@ -14,6 +14,7 @@ type PackageInfo struct {
 	InAUR     bool
 	Exists    bool
 	Installed bool
+	Provided  string
 	AURInfo   *aur.Package
 }
 
@@ -38,10 +39,18 @@ func (f *Fetcher) Close() error {
 	return f.alpmHandle.Release()
 }
 
+func (f *Fetcher) FetchAur(packages []string) (map[string]aur.Package, error) {
+	return f.aurClient.Fetch(packages)
+}
+
 func (f *Fetcher) GetAURPackage(name string) (aur.Package, bool) {
 	return f.aurClient.Get(name)
 }
 
+func (f *Fetcher) FindProvidingPackage(depName string) (string, bool) {
+	return f.alpmHandle.FindProvidingPackage(depName)
+}
+
 func (f *Fetcher) Resolve(packages []string) (map[string]*PackageInfo, error) {
 	start := time.Now()
 	log.Debug("fetch.Resolve: starting...")
@@ -98,6 +107,13 @@ func (f *Fetcher) Resolve(packages []string) (map[string]*PackageInfo, error) {
 				continue
 			}
 
+			if providedBy, ok := f.FindProvidingPackage(pkg); ok {
+				log.Debug("fetch.Resolve: %s provided by %s", pkg, providedBy)
+				info.Provided = providedBy
+				info.Exists = true
+				continue
+			}
+
 			return nil, fmt.Errorf("package not found: %s", pkg)
 		}
 	}