Add git.clone and git.checkout states

app/classes/git/Repository.js

@@ -62,6 +62,20 @@ class Repository extends Injectable {
         await this._git_cmd(`checkout "${ref}"`)
     }
 
+    async current_branch() {
+        const cd_cmd = await this._host.get_directory_change_command(this._path)
+        const cmd = `${cd_cmd} && git symbolic-ref HEAD`
+        const full_ref = await this._host.run_line_result(cmd)
+        return full_ref.replace('refs/heads/', '')
+    }
+
+    async current_ref() {
+        const cd_cmd = await this._host.get_directory_change_command(this._path)
+        const cmd = `${cd_cmd} && git show-ref HEAD`
+        const ref = await this._host.run_line_result(cmd)
+        return ref.split(' ')[0]
+    }
+
     async stash() {
         await this._git_cmd(`stash`)
     }

app/classes/state/git/CheckoutState.js

@@ -0,0 +1,45 @@
+const State = require('../State')
+const Repository = require('../../git/Repository')
+
+class CheckoutState extends State {
+    static get services() {
+        return [...super.services, 'output']
+    }
+
+    async apply() {
+        if ( !(await this.check()) ) {
+            const repo = await this._repo()
+            await repo.checkout(this._config.target)
+        }
+    }
+
+    async check() {
+        const repo = await this._repo()
+        const target = await this._config.target
+        try {
+            if ( (await repo.current_branch()) === target ) return true
+            if ( (await repo.current_ref()) === target ) return true
+        } catch (e) {}
+        return false
+    }
+
+    async reverse() {
+        if ( this._config.revert_to ) {
+            if ( await this.check() ) {
+                const repo = await this._repo()
+                await repo.checkout(this._config.revert_to)
+            }
+        } else {
+            this.output.warn('Checkout state does not currently support automatic reversal. Specify the revert_to config key to enable.')
+        }
+    }
+
+    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

@@ -0,0 +1,33 @@
+const State = require('../State')
+const Repository = require('../../git/Repository')
+
+class CloneState extends State {
+
+    async apply() {
+        if ( !(await this.check()) ) {
+            const repo = await this._repo()
+            await repo.clone(this._config.source)
+        }
+    }
+
+    async check() {
+        const repo = await this._repo()
+        return repo.is_repo()
+    }
+
+    async reverse() {
+        if ( await this.check() ) {
+            const path = await this._host.get_path(this._config.path)
+            await path.unlink()
+        }
+    }
+
+    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/os/CommandState.js

@@ -18,6 +18,8 @@ class CommandState extends State {
         if ( this._config.reverse ) {
             const cmd = `${this._config.reverse}`
             await this._host.run(cmd)
+        } else {
+            this.output.warn(`No reversal command specified for Command State. Nothing was changed. (Host: ${this._host.name})`)
         }
     }