Add initial implementation for the aliases command (#1)

* Add initial implementation for the aliases command

README.md

@@ -1,5 +1,5 @@
 # Donner
-[![Go Report Card](https://goreportcard.com/badge/github.com/jfahrer/donner)](https://goreportcard.com/report/github.com/jfahrer/donner)
+[![Go Report Card](https://goreportcard.com/badge/github.com/codetales/donner)](https://goreportcard.com/report/github.com/codetales/donner)
 
 :boom: Donner is a generic command wrapper. It let's you define strategies to wrap commands in things like `docker-compose exec` or `docker container run`.  
 This is can come in very handy when developing applications in containers.  

aliases.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+func printAliases(cfg *Cfg, strictMode, fallbackMode bool) {
+	commands := cfg.ListCommands()
+	outputs := make([]string, len(commands))
+
+	flags := make([]string, 0, 2)
+	if strictMode {
+		flags = append(flags, "--strict")
+	}
+
+	if fallbackMode {
+		flags = append(flags, "--fallback")
+	}
+
+	for i, c := range commands {
+		output := append(flags, c)
+		outputs[i] = strings.Join(output, " ")
+	}
+
+	fmt.Println()
+	for i, c := range commands {
+		fmt.Printf("alias %s='donner run %s'\n", c, outputs[i])
+	}
+
+	aliasCommand := strings.Join(append([]string{"donner", "aliases"}, flags...), " ")
+
+	fmt.Printf("\n# copy and paste the output into your terminal or run\n")
+	fmt.Printf("#  eval $(%s)\n", aliasCommand)
+}

donner.go

@@ -3,11 +3,12 @@ package main
 import (
 	"errors"
 	"fmt"
-	"github.com/urfave/cli"
 	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
+
+	"github.com/urfave/cli"
 )
 
 // ErrUndefinedCommand is thrown if a command specified can't be found in the yaml definition
@@ -34,25 +35,28 @@ func main() {
 			Usage:           "run a command",
 			SkipFlagParsing: true,
 			Action: func(c *cli.Context) error {
-				// TODO handle 'yaml' case
-				dat, err := ioutil.ReadFile(".donner.yml")
+				cfg, err := readConfig()
 				if err != nil {
 					return err
 				}
-
-				cfg, err := parseFile(dat)
-				if err != nil {
-					return err
-				}
-
 				return execCommand(cfg, c.Args())
 			},
 		},
 		{
 			Name:    "aliases",
 			Aliases: []string{"a"},
 			Usage:   "generate aliases",
+			Flags: []cli.Flag{
+				cli.BoolFlag{Name: "strict,s", Usage: "enable strict mode"},
+				cli.BoolFlag{Name: "fallback,f", Usage: "fallback to local commands"},
+			},
 			Action: func(c *cli.Context) error {
+				cfg, err := readConfig()
+				if err != nil {
+					return err
+				}
+				printAliases(cfg, c.Bool("strict"), c.Bool("fallback"))
+
 				return nil
 			},
 		},
@@ -112,3 +116,18 @@ func execCommand(cfg *Cfg, params []string) error {
 
 	return nil
 }
+
+func readConfig() (*Cfg, error) {
+	// TODO handle 'yaml' case
+	dat, err := ioutil.ReadFile(".donner.yml")
+	if err != nil {
+		return nil, err
+	}
+
+	cfg, err := parseFile(dat)
+	if err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}

go.mod

@@ -3,7 +3,8 @@ module github.com/jfahrer/donner
 go 1.12
 
 require (
-	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/kr/pretty v0.1.0 // indirect
 	github.com/stretchr/testify v1.3.0
 	github.com/urfave/cli v1.20.0
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect

go.sum

@@ -1,16 +1,20 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.2.0 h1:Hbg2NidpLE8veEBkEZTL3CvlkUIVzuU9jDplZO54c48=
-github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

parser.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+
 	"gopkg.in/yaml.v2"
 )
 
@@ -38,6 +39,7 @@ type Strategy struct {
 	Image   string
 }
 
+// Validate checks whether the configuration specifies all mandatory properties
 func (c *Cfg) Validate() error {
 	if len(c.Strategies) == 0 {
 		return ErrNoStrategiesSpecified
@@ -50,6 +52,15 @@ func (c *Cfg) Validate() error {
 	return nil
 }
 
+// ListCommands allows for retrieval of all defined commands in a config
+func (c *Cfg) ListCommands() []string {
+	commands := make([]string, 0, len(c.Commands))
+	for cmd := range c.Commands {
+		commands = append(commands, cmd)
+	}
+	return commands
+}
+
 // Validate checks whether a strategy specifies only valid handlers
 func (s *Strategy) Validate() error {
 	_, ok := availableHandlers[s.Handler]

parser_test.go

@@ -58,3 +58,9 @@ func TestParseFile(t *testing.T) {
 		})
 	}
 }
+
+func TestListCommands(t *testing.T) {
+	cfg, err := parseFile([]byte(fullYaml))
+	assert.NoError(t, err)
+	assert.ElementsMatch(t, cfg.ListCommands(), []string{"ls", "bundle"})
+}