From c7f2c9c704711b0d2da16cc42fa1a51f7dd09454 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Sat, 26 Jan 2019 01:09:50 -0500
Subject: [PATCH] More plugin manager work

---
 cmd/micro/manager/fetch.go                 | 37 ++++++++++++++++--
 cmd/micro/manager/{parser.go => plugin.go} | 45 ++++++++++++++++------
 2 files changed, 68 insertions(+), 14 deletions(-)
 rename cmd/micro/manager/{parser.go => plugin.go} (79%)

diff --git a/cmd/micro/manager/fetch.go b/cmd/micro/manager/fetch.go
index 97245676..4e68b5a1 100644
--- a/cmd/micro/manager/fetch.go
+++ b/cmd/micro/manager/fetch.go
@@ -3,6 +3,7 @@ package manager
 import (
 	"io/ioutil"
 	"net/http"
+	"os"
 	"path"
 
 	"github.com/zyedidia/micro/cmd/micro/config"
@@ -29,18 +30,48 @@ func NewPluginInfoFromUrl(url string) (*PluginInfo, error) {
 
 // FetchRepo downloads this plugin's git repository
 func (i *PluginInfo) FetchRepo() error {
-	_, err := git.PlainClone(path.Join(config.ConfigDir, "plugin", i.Name), false, &git.CloneOptions{
+	dir := path.Join(config.ConfigDir, "plugin", i.Name)
+	r, err := git.PlainClone(dir, false, &git.CloneOptions{
 		URL:      i.Repo,
 		Progress: nil,
 	})
 
+	if err != nil {
+		return err
+	}
+
+	p := &Plugin{
+		info: i,
+		dir:  dir,
+		repo: r,
+	}
+
+	err = p.ResolveVersion()
+	if err != nil {
+		return err
+	}
+	err = p.WriteVersion()
+
 	return err
 }
 
-func (i *PluginInfo) FetchDeps() error {
+func (p *Plugin) ResolveVersion() error {
 	return nil
 }
 
-func (i *PluginInfo) PostInstallHooks() error {
+func (p *Plugin) WriteVersion() error {
+	return ioutil.WriteFile(path.Join(p.dir, versionfile), []byte(p.version.String()), os.ModePerm)
+}
+
+func (p *Plugin) FetchDeps() error {
+	_, err := ListInstalledPlugins()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (p *Plugin) PostInstallHooks() error {
 	return nil
 }
diff --git a/cmd/micro/manager/parser.go b/cmd/micro/manager/plugin.go
similarity index 79%
rename from cmd/micro/manager/parser.go
rename to cmd/micro/manager/plugin.go
index d4eb63b0..4b54f268 100644
--- a/cmd/micro/manager/parser.go
+++ b/cmd/micro/manager/plugin.go
@@ -22,12 +22,25 @@ var (
 	ErrMissingRequire  = errors.New("Missing or empty require field")
 )
 
+const (
+	infojson    = "plugin.json"
+	versionfile = "version.lock"
+)
+
 type Plugin struct {
-	info *PluginInfo
-	dir  string
-	repo *git.Repository
-	// Index into info.Versions showing the current version of this plugin
-	Version int
+	info    *PluginInfo
+	dir     string
+	repo    *git.Repository
+	version semver.Version // currently installed version
+}
+
+func (p *Plugin) GetRequires() *PluginVersion {
+	for _, v := range p.info.Versions {
+		if p.version.Equals(v.Vers) {
+			return &v
+		}
+	}
+	return nil
 }
 
 // PluginVersion describes a version for a plugin as well as any dependencies that
@@ -98,7 +111,7 @@ func (i *PluginInfo) makeVersions() error {
 	return nil
 }
 
-// InstalledPlugins searches the config directory for all installed plugins
+// ListInstalledPlugins searches the config directory for all installed plugins
 // and returns the list of plugin infos corresponding to them
 func ListInstalledPlugins() ([]*Plugin, error) {
 	pdir := path.Join(config.ConfigDir, "plugin")
@@ -118,8 +131,8 @@ func ListInstalledPlugins() ([]*Plugin, error) {
 			}
 
 			for _, f := range files {
-				if f.Name() == "repo.json" {
-					dat, err := ioutil.ReadFile(path.Join(pdir, dir.Name(), "repo.json"))
+				if f.Name() == infojson {
+					dat, err := ioutil.ReadFile(path.Join(pdir, dir.Name(), infojson))
 					if err != nil {
 						return nil, err
 					}
@@ -128,6 +141,15 @@ func ListInstalledPlugins() ([]*Plugin, error) {
 						return nil, err
 					}
 
+					versiondat, err := ioutil.ReadFile(path.Join(pdir, dir.Name(), versionfile))
+					if err != nil {
+						return nil, err
+					}
+					sv, err := semver.Make(string(versiondat))
+					if err != nil {
+						return nil, err
+					}
+
 					dirname := path.Join(pdir, dir.Name())
 					r, err := git.PlainOpen(dirname)
 					if err != nil {
@@ -135,9 +157,10 @@ func ListInstalledPlugins() ([]*Plugin, error) {
 					}
 
 					p := &Plugin{
-						info: info,
-						dir:  dirname,
-						repo: r,
+						info:    info,
+						dir:     dirname,
+						repo:    r,
+						version: sv,
 					}
 
 					plugins = append(plugins, p)