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mkenv.go
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mkenv.go
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/*
Copyright (C) 2014 Oscar Campos <oscar.campos@member.fsf.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See LICENSE file for more details.
*/
package commands
import (
"encoding/json"
"fmt"
"log"
"os"
"path/filepath"
"github.com/DamnWidget/VenGO/env"
"github.com/DamnWidget/VenGO/utils"
)
// mkenv command
type Mkenv struct {
Force bool
Name string
Prompt string
Version string
}
// Create a new mkenv command and return back it's address
func NewMkenv(options ...func(i *Mkenv)) *Mkenv {
mkenv := &Mkenv{Name: "", Prompt: "", Version: ""}
for _, option := range options {
option(mkenv)
}
if mkenv.Prompt == "" {
mkenv.Prompt = mkenv.Name
}
return mkenv
}
// implements the Runner interface creating the new virtual environment
func (m *Mkenv) Run() (string, error) {
fmt.Print("Checking intalled go versions... ")
if err := m.checkInstalled(); err != nil {
log.Println(utils.Fail("✖"))
return "", err
}
fmt.Println(utils.Ok("✔"))
newEnv := env.NewEnvironment(m.Name, m.Prompt)
if newEnv.Exists() && !m.Force {
suggest := fmt.Sprintf(
" %s: use --force to force reinstallation", utils.Ok("suggestion"))
return "", fmt.Errorf("error: %s already exists\n%s", m.Name, suggest)
}
if err := newEnv.Generate(); err != nil {
os.RemoveAll(filepath.Join(os.Getenv("VENGO_HOME"), m.Name))
return "", err
}
if err := newEnv.Install(m.Version); err != nil {
os.RemoveAll(filepath.Join(os.Getenv("VENGO_HOME"), m.Name))
return "", err
}
return fmt.Sprintf(
"%s", utils.Ok(fmt.Sprintf(
"Go %s environment created using %s", m.Name, m.Version))), nil
}
// check if the Go version used to generate the virtual environment is
// installed or not, if is not, return a NotIntalled error type
func (m *Mkenv) checkInstalled() error {
l := NewList(func(l *List) {
l.DisplayAs = Json
})
result, err := l.Run()
if err != nil {
return err
}
jsonData := new(BriefJSON)
if err := json.Unmarshal([]byte(result), jsonData); err != nil {
return err
}
for _, v := range jsonData.Installed {
if v == m.Version {
return nil
}
}
return ErrNotInstalled
}