Initial commit

LICENSE

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+Copyright 2018 Tobias Salzmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# 2slack
+
+Send a message to slack
+
+```bash
+echo "Hello World" | 2slack
+```
+
+## Usage
+```json
+usage: 2slack [<flags>] [<message>]
+
+Flags:
+      --help                 Show context-sensitive help (also try --help-long and --help-man).
+  -c, --channel=CHANNEL ...  Slack Channel Name or ID
+  -t, --token=TOKEN          Slack token
+      --title=TITLE          Message title
+      --footer=FOOTER        Footer to use
+      --color=COLOR          Message color
+      --username=USERNAME    Username to use
+      --version              Show application version.
+
+Args:
+  [<message>]  Message text
+```
+
+# Installation
+You find releases in [Github Releases](releases) section.
+
+Or you can use `go get`:
+```bash
+go get github.com/Eun/2slack
+```
+
+You can find instructions for slack [here](slack/README.md)
+
+# Examples
+
+```bash
+2slack --channel=Channel1 --token=MySlackToken --title=Title --color=green "Hello from 2slack"
+date | 2slack --channel=Channel1 --token=MySlackToken --title=Title --color=ff0000
+```
+
+## Using environment variables
+```bash
+
+export SLACK_CHANNEL = Channel1
+export SLACK_TOKEN = MySlackToken
+export SLACK_TITLE = Date
+export SLACK_COLOR = green
+
+date | 2slack
+2slack "Hello World!"
+```

main.go

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+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/nlopes/slack"
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+var (
+	channelFlag  = kingpin.Flag("channel", "Slack Channel Name or ID").Short('c').Strings()
+	tokenFlag    = kingpin.Flag("token", "Slack token").Short('t').String()
+	titleFlag    = kingpin.Flag("title", "Message title").String()
+	footerFlag   = kingpin.Flag("footer", "Footer to use").String()
+	colorFlag    = kingpin.Flag("color", "Message color").String()
+	usernameFlag = kingpin.Flag("username", "Username to use").String()
+	messageArg   = kingpin.Arg("message", "Message text").String()
+)
+
+func main() {
+	kingpin.Version("1.0.0")
+	kingpin.Parse()
+
+	if channelFlag == nil || len(*channelFlag) <= 0 {
+		if env := os.Getenv("SLACK_CHANNEL"); len(env) > 0 {
+			channelFlag = new([]string)
+			parts := strings.Split(env, ",")
+			for i := 0; i < len(parts); i++ {
+				if part := strings.TrimSpace(parts[i]); len(part) > 0 {
+					*channelFlag = append(*channelFlag, part)
+				}
+			}
+		} else {
+			fmt.Println("No environment variable `SLACK_CHANNEL' present")
+			os.Exit(1)
+		}
+	}
+
+	if tokenFlag == nil || len(*tokenFlag) <= 0 {
+		if env := os.Getenv("SLACK_TOKEN"); len(env) > 0 {
+			tokenFlag = new(string)
+			*tokenFlag = env
+		} else {
+			fmt.Println("No environment variable `SLACK_TOKEN' present")
+			os.Exit(1)
+		}
+	}
+	*tokenFlag = strings.TrimSpace(*tokenFlag)
+
+	if titleFlag == nil || len(*titleFlag) <= 0 {
+		titleFlag = new(string)
+		if env := os.Getenv("SLACK_TITLE"); len(env) > 0 {
+			*titleFlag = env
+		} else {
+			*titleFlag = ""
+		}
+	}
+	*titleFlag = strings.TrimSpace(*titleFlag)
+
+	if footerFlag == nil || len(*footerFlag) <= 0 {
+		footerFlag = new(string)
+		if env := os.Getenv("SLACK_FOOTER"); len(env) > 0 {
+			*footerFlag = env
+		} else {
+			*footerFlag = ""
+		}
+	}
+	*footerFlag = strings.TrimSpace(*footerFlag)
+
+	if colorFlag == nil || len(*colorFlag) <= 0 {
+		colorFlag = new(string)
+		if env := os.Getenv("SLACK_COLOR"); len(env) > 0 {
+			*colorFlag = env
+		} else {
+			*colorFlag = ""
+		}
+	}
+	*colorFlag = strings.TrimSpace(*colorFlag)
+
+	if usernameFlag == nil || len(*usernameFlag) <= 0 {
+		usernameFlag = new(string)
+		if env := os.Getenv("SLACK_USERNAME"); len(env) > 0 {
+			*usernameFlag = env
+		} else {
+			*usernameFlag = ""
+		}
+	}
+	*usernameFlag = strings.TrimSpace(*usernameFlag)
+
+	// read message
+	if messageArg == nil || len(*messageArg) <= 0 {
+		var builder strings.Builder
+		_, err := io.Copy(&builder, os.Stdin)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		messageArg = new(string)
+		*messageArg = builder.String()
+	}
+
+	if len(strings.TrimSpace(*messageArg)) <= 0 {
+		return
+	}
+
+	// get channel ID
+	var channelIDs []string
+	api := slack.New(*tokenFlag)
+	channels, err := api.GetChannels(true)
+	if err != nil {
+		fmt.Println("Unable to receive channel list:")
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	for _, channel := range channels {
+		for i := 0; i < len(*channelFlag); i++ {
+			if strings.EqualFold(channel.NameNormalized, (*channelFlag)[i]) || strings.EqualFold(channel.Name, (*channelFlag)[i]) || strings.EqualFold(channel.ID, (*channelFlag)[i]) {
+				channelIDs = append(channelIDs, channel.ID)
+			}
+		}
+	}
+
+	groups, err := api.GetGroups(true)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Unable to receive (private) channel list:\n")
+		fmt.Fprintln(os.Stderr, err)
+	} else {
+		for _, channel := range groups {
+			for i := 0; i < len(*channelFlag); i++ {
+				if strings.EqualFold(channel.NameNormalized, (*channelFlag)[i]) || strings.EqualFold(channel.Name, (*channelFlag)[i]) || strings.EqualFold(channel.ID, (*channelFlag)[i]) {
+					channelIDs = append(channelIDs, channel.ID)
+				}
+			}
+		}
+	}
+
+	if len(channelIDs) <= 0 {
+		fmt.Println("No channels found")
+		os.Exit(1)
+	}
+
+	var text string
+
+	parameters := slack.PostMessageParameters{
+		AsUser: false,
+	}
+
+	if len(*titleFlag) > 0 || len(*colorFlag) > 0 || len(*footerFlag) > 0 || len(*messageArg) > 1024 {
+		var attachment slack.Attachment
+
+		if len(*titleFlag) > 0 {
+			attachment.Title = *titleFlag
+		}
+		if len(*footerFlag) > 0 {
+			attachment.Footer = *footerFlag
+		}
+		if len(*colorFlag) > 0 {
+			attachment.Color = *colorFlag
+		}
+		attachment.Text = *messageArg
+
+		parameters.Attachments = []slack.Attachment{
+			attachment,
+		}
+	} else {
+		text = *messageArg
+	}
+
+	if len(*usernameFlag) > 0 {
+		parameters.Username = *usernameFlag
+	}
+
+	for i := 0; i < len(channelIDs); i++ {
+		_, _, err := api.PostMessage(channelIDs[i], text, parameters)
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}
+}

slack/README.md

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+## Slack Installation
+
+To use **2slack** you need an Slack Token that has the needed permissions.
+
+### Goto [slack API](https://api.slack.com/apps) and `Create New App`
+![Step1](step1.png)
+### Use a good name for the `App Name` (e.g. `2slack`)
+### Select your Workspace in `Development Slack Workspace`
+![Step2](step2.png)
+### Navigate to your App `OAuth & Permissions` setting
+![Step3](step3.png)
+### Scroll to `Scopes` and add the Permissions
+- Access information about user’s public channels (`channels:read`)
+- Send messages as *App-Name* (`chat:write:bot`)
+- Access information about user’s private channels (`groups:read`)
+
+
+![Step4](step4.png)
+### Install and Authorize the App
+![Step5](step5.png)
+![Step6](step6.png)
+### You find the token in the App settings
+![Step7](step7.png)