Add git.tag state; abstract out AbstractGitState class

app/classes/git/Repository.js

@@ -50,10 +50,20 @@ class Repository extends Injectable {
         await this._git_cmd(`commit -m "${message}"`)
     }
 
-    async tag(label) {
+    async create_tag(label) {
         await this._git_cmd(`tag "${label}"`)
     }
 
+    async delete_tag(label) {
+        await this._git_cmd(`tag --delete "${label}"`)
+    }
+
+    async get_tag(label) {
+        const cd_cmd = await this._host.get_directory_change_command(this._path)
+        const cmd = `${cd_cmd} && git rev-parse "${label}"`
+        return await this._host.run_line_result(cmd)
+    }
+
     async push(target = false, ref = false) {
         await this._git_cmd(`push${target ? ' '+target : ''}${ref ? ' '+ref : ''} --tags`)
     }

app/classes/state/git/AbstractGitState.js

@@ -0,0 +1,14 @@
+const State = require('../State')
+const Repository = require('../../git/Repository')
+
+class AbstractGitState extends State {
+
+    async _repo() {
+        const path = await this._host.get_path(this._config.path)
+        if ( !path.is_valid() ) await path.touch(true)
+        return new Repository(path)
+    }
+
+}
+
+module.exports = exports = AbstractGitState

app/classes/state/git/CheckoutState.js

@@ -1,7 +1,6 @@
-const State = require('../State')
-const Repository = require('../../git/Repository')
+const AbstractGitState = require('./AbstractGitState')
 
-class CheckoutState extends State {
+class CheckoutState extends AbstractGitState {
     static get services() {
         return [...super.services, 'output']
     }
@@ -34,12 +33,6 @@ class CheckoutState extends State {
         }
     }
 
-    async _repo() {
-        const path = await this._host.get_path(this._config.path)
-        if ( !path.is_valid() ) await path.touch(true)
-        return new Repository(path)
-    }
-
 }
 
 module.exports = exports = CheckoutState

app/classes/state/git/CloneState.js

@@ -1,7 +1,6 @@
-const State = require('../State')
-const Repository = require('../../git/Repository')
+const AbstractGitState = require('./AbstractGitState')
 
-class CloneState extends State {
+class CloneState extends AbstractGitState {
 
     async apply() {
         if ( !(await this.check()) ) {
@@ -22,12 +21,6 @@ class CloneState extends State {
         }
     }
 
-    async _repo() {
-        const path = await this._host.get_path(this._config.path)
-        if ( !path.is_valid() ) await path.touch(true)
-        return new Repository(path)
-    }
-
 }
 
 module.exports = exports = CloneState

app/classes/state/git/TagState.js

@@ -0,0 +1,31 @@
+const AbstractGitState = require('./AbstractGitState')
+
+class TagState extends AbstractGitState {
+
+    async apply() {
+        if ( !(await this.check()) ) {
+            const repo = await this._repo()
+            await repo.create_tag(this._config.tag)
+        }
+    }
+
+    async check() {
+        const repo = await this._repo()
+        try {
+            await repo.get_tag(this._config.tag)
+            return true
+        } catch (e) {
+            return false
+        }
+    }
+
+    async reverse() {
+        if ( await this.check() ) {
+            const repo = await this._repo()
+            await repo.delete_tag(this._config.tag)
+        }
+    }
+
+}
+
+module.exports = exports = TagState

app/services/states.service.js

@@ -25,6 +25,7 @@ class StatesService extends Service {
 
         'git.clone': require('../classes/state/git/CloneState'),
         'git.checkout': require('../classes/state/git/CheckoutState'),
+        'git.tag': require('../classes/state/git/TagState'),
 
         'os.cmd': require('../classes/state/os/CommandState'),