Rearrange some code, adds pm av

available.go

@@ -9,8 +9,20 @@ import (
 // Name exists to document the keys in Available
 type Name string
 
+type Names []Name
+
+func (n Names) Len() int           { return len(n) }
+func (n Names) Swap(a, b int)      { n[a], n[b] = n[b], n[a] }
+func (n Names) Less(a, b int) bool { return n[a] < n[b] }
+
 // Version exists to document the keys in Available
 type Version string
+type Versions []Version
+
+// TODO (sm): make this semver sort?
+func (n Versions) Len() int           { return len(n) }
+func (n Versions) Swap(a, b int)      { n[a], n[b] = n[b], n[a] }
+func (n Versions) Less(a, b int) bool { return n[a] < n[b] }
 
 // Available is the structure used to represent the collection of all packages
 // that can be installed.

cmd/pm/main.go

@@ -8,14 +8,15 @@ import (
 
 	"github.com/pkg/errors"
 	"mcquay.me/fs"
+	"mcquay.me/pm/db"
 	"mcquay.me/pm/keyring"
 	"mcquay.me/pm/pkg"
-	"mcquay.me/pm/remote"
 )
 
 const usage = `pm: simple, cross-platform system package manager
 
 subcommands:
+  available  (av)  -- print out all installable packages
   environ    (env) -- print environment information
   keyring    (key) -- interact with pm's OpenPGP keyring
   package    (pkg) -- create packages
@@ -193,25 +194,29 @@ func main() {
 			if len(args) < 1 {
 				fatalf("missing arg\n\nusage: pm remote add [<uris>]\n")
 			}
-			if err := remote.Add(root, args); err != nil {
+			if err := db.AddRemotes(root, args); err != nil {
 				fatalf("remote add: %v\n", err)
 			}
 		case "rm":
 			if len(args) < 1 {
 				fatalf("missing arg\n\nusage: pm remote rm [<uris>]\n")
 			}
-			if err := remote.Remove(root, args); err != nil {
+			if err := db.RemoveRemotes(root, args); err != nil {
 				fatalf("remote remove: %v\n", err)
 			}
 		case "ls":
-			if err := remote.List(root, os.Stdout); err != nil {
+			if err := db.ListRemotes(root, os.Stdout); err != nil {
 				fatalf("list: %v\n", err)
 			}
 		default:
 			fatalf("unknown package subcommand: %q\n\nusage: %v", sub, remoteUsage)
 		}
 	case "pull":
-		if err := remote.Pull(root); err != nil {
+		if err := db.Pull(root); err != nil {
+			fatalf("pulling available packages: %v\n", err)
+		}
+	case "available", "av":
+		if err := db.ListAvailable(root, os.Stdout); err != nil {
 			fatalf("pulling available packages: %v\n", err)
 		}
 	default:

db/available.go

@@ -1,12 +1,16 @@
-package remote
+package db
 
 import (
 	"encoding/json"
+	"fmt"
+	"io"
 	"net/http"
 	"os"
 	"path/filepath"
+	"sort"
 
 	"github.com/pkg/errors"
+	"mcquay.me/fs"
 	"mcquay.me/pm"
 )
 
@@ -46,6 +50,52 @@ func Pull(root string) error {
 	return nil
 }
 
+// ListAvailable prints all installable packages
+func ListAvailable(root string, w io.Writer) error {
+	db, err := loadAvailable(root)
+	if err != nil {
+		return errors.Wrap(err, "loading")
+	}
+	names := pm.Names{}
+	nvs := map[pm.Name]pm.Versions{}
+	for n, vers := range db {
+		names = append(names, n)
+		for v := range vers {
+			nvs[n] = append(nvs[n], v)
+		}
+		sort.Sort(nvs[n])
+	}
+	sort.Sort(names)
+
+	for _, n := range names {
+		for _, v := range nvs[n] {
+			m := db[n][v]
+			fmt.Fprintf(w, "%v\t%v\t%v\n", m.Name, m.Version, m.Remote.String())
+		}
+	}
+	return nil
+}
+
+func loadAvailable(root string) (pm.Available, error) {
+	r := pm.Available{}
+	dbn := filepath.Join(root, rn)
+
+	if !fs.Exists(dbn) {
+		return r, nil
+	}
+
+	f, err := os.Open(filepath.Join(root, an))
+	if err != nil {
+		return r, errors.Wrap(err, "open")
+	}
+
+	if err := json.NewDecoder(f).Decode(&r); err != nil {
+		return r, errors.Wrap(err, "decoding db")
+	}
+
+	return r, nil
+}
+
 func saveAvailable(root string, db pm.Available) error {
 	f, err := os.Create(filepath.Join(root, an))
 	if err != nil {

db/remote.go

@@ -1,4 +1,4 @@
-package remote
+package db
 
 import (
 	"encoding/json"
@@ -17,8 +17,8 @@ type DB []url.URL
 
 const rn = "var/lib/pm/remotes.json"
 
-// Add appends the provided uri to the list of configured remotes.
-func Add(root string, uris []string) error {
+// AddRemotes appends the provided uri to the list of configured remotes.
+func AddRemotes(root string, uris []string) error {
 	db, err := load(root)
 	if err != nil {
 		return errors.Wrap(err, "loading")
@@ -46,8 +46,8 @@ func Add(root string, uris []string) error {
 	return save(root, db)
 }
 
-// Remove removes the given uri from the list of configured remotes.
-func Remove(root string, uris []string) error {
+// RemoveRemotes removes the given uri from the list of configured remotes.
+func RemoveRemotes(root string, uris []string) error {
 	db, err := load(root)
 	if err != nil {
 		return errors.Wrap(err, "loading")
@@ -79,8 +79,8 @@ func Remove(root string, uris []string) error {
 	return save(root, o)
 }
 
-// List prints all configured remotes to w.
-func List(root string, w io.Writer) error {
+// ListRemotes prints all configured remotes to w.
+func ListRemotes(root string, w io.Writer) error {
 	db, err := load(root)
 	if err != nil {
 		return errors.Wrap(err, "loading")

db/remote_test.go

@@ -1,4 +1,4 @@
-package remote
+package db
 
 import (
 	"bytes"
@@ -46,7 +46,7 @@ func TestAdd(t *testing.T) {
 		"http\ns://\nFoo|n",
 	}
 
-	if err := Add(root, bad); err == nil {
+	if err := AddRemotes(root, bad); err == nil {
 		t.Fatalf("didn't detect bad url")
 	}
 
@@ -54,7 +54,7 @@ func TestAdd(t *testing.T) {
 		"https://pm.mcquay.me/darwin/amd64",
 	}
 
-	if err := Add(root, uris); err != nil {
+	if err := AddRemotes(root, uris); err != nil {
 		t.Fatalf("add: %v", err)
 	}