From bd06d484c25a0bdf3bdb0998caa5403fa38bcc63 Mon Sep 17 00:00:00 2001
From: stephen mcquay <stephen@mcquay.me>
Date: Tue, 6 Mar 2018 20:35:03 -0800
Subject: [PATCH] Stubs out pm rm

---
 cmd/pm/main.go  |  9 +++++++++
 db/installed.go |  4 ++++
 installed.go    | 10 +++++++++-
 pkg/remove.go   | 24 ++++++++++++++++++++++++
 4 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 pkg/remove.go

diff --git a/cmd/pm/main.go b/cmd/pm/main.go
index 7cf6687..b234147 100644
--- a/cmd/pm/main.go
+++ b/cmd/pm/main.go
@@ -27,6 +27,7 @@ subcommands:
   package    (pkg) -- create packages
   pull             -- fetch all available packages from all configured remotes
   remote           -- configure remote pmd servers
+  rm               -- remove packages
   version    (v)   -- print version information
 `
 
@@ -237,6 +238,14 @@ func main() {
 		if err := db.ListInstalled(root, os.Stdout); err != nil {
 			fatalf("listing installed: %v\n", err)
 		}
+	case "rm":
+		if len(os.Args[1:]) < 2 {
+			fatalf("pm rm: insufficient args\n\nusage: pm rm [pkg1, pkg2, ..., pkgN]\n")
+		}
+		pkgs := os.Args[2:]
+		if err := pkg.Remove(root, pkgs); err != nil {
+			fatalf("removing: %v\n", err)
+		}
 	case "version", "v":
 		fmt.Printf("pm: version %v\n", Version)
 	default:
diff --git a/db/installed.go b/db/installed.go
index 22b4eb2..c3045b3 100644
--- a/db/installed.go
+++ b/db/installed.go
@@ -48,6 +48,10 @@ func ListInstalled(root string, w io.Writer) error {
 	return nil
 }
 
+func LoadInstalled(root string) (pm.Installed, error) {
+	return loadi(root)
+}
+
 func loadi(root string) (pm.Installed, error) {
 	r := pm.Installed{}
 	dbn := filepath.Join(root, in)
diff --git a/installed.go b/installed.go
index aaa2608..df4a711 100644
--- a/installed.go
+++ b/installed.go
@@ -1,6 +1,9 @@
 package pm
 
-import "sort"
+import (
+	"errors"
+	"sort"
+)
 
 // Installed tracks installed packages.
 type Installed map[Name]Meta
@@ -22,3 +25,8 @@ func (i Installed) Traverse() <-chan Meta {
 	}()
 	return r
 }
+
+// Removable calculates if the packages requested in "in" can all be removed.
+func (i Installed) Removable(names []string) (Metas, error) {
+	return nil, errors.New("NYI")
+}
diff --git a/pkg/remove.go b/pkg/remove.go
new file mode 100644
index 0000000..9be913d
--- /dev/null
+++ b/pkg/remove.go
@@ -0,0 +1,24 @@
+package pkg
+
+import (
+	"log"
+
+	"github.com/pkg/errors"
+	"mcquay.me/pm/db"
+)
+
+// Remove uninstalls packages.
+func Remove(root string, pkgs []string) error {
+	iDB, err := db.LoadInstalled(root)
+	if err != nil {
+		return errors.Wrap(err, "loading available db")
+	}
+
+	ms, err := iDB.Removable(pkgs)
+	if err != nil {
+		return errors.Wrap(err, "checking ability to remove")
+	}
+	log.Printf("%+v", ms)
+
+	return errors.New("NYI")
+}