notify_slack

Post to Slack from the command line. If you pass the standard output of the command to notify_slack by pipe, it will post to slack once a second (can be changed with the -interval option).

https://user-images.githubusercontent.com/1249910/155869750-48f7500f-4481-49b6-9d65-b93205f2b94f.mp4

(same movie) https://www.youtube.com/watch?v=wmKSr9Aoz-Y

Installation

I recommend you to use the binaries on GitHub Releases. Please download the latest version and use it.

If you have a development environment for the Go language, you can compile and install it by yourself.

go install github.com/catatsuy/notify_slack/cmd/notify_slack@latest

If you want to develop it, you can use the make. It requires Go 1.17 or higher.

make

If you use make, the output of notify_slack -version is git commit ID.

usage

./bin/notify_slack posts to Slack. You specify the setting in command line option or toml setting file. If both settings are specified, command line option will always take precedence.

./bin/output | ./bin/notify_slack

./bin/output is used for testing. While buffering, to post to slack.

./bin/notify_slack README.md

You post the file as a snippet. token and channel is required to use the Slack Web API.

If you want to upload to snippet via standard input, you must specify -snippet. If you specify filename, you can change the file name on Slack.

git diff | ./bin/notify_slack -snippet -filename git.diff

Slack's API can specify filetype. You can also specify -filetype. But it is automatically determined from the extension of the file. You make sure to give the appropriate extension.

file type | Slack

CLI options

-c string
      config file name
-channel string
      specify channel (unavailable for new Incoming Webhooks)
-filename string
      specify a file name (for uploading to snippet)
-filetype string
      specify a filetype (for uploading to snippet)
-icon-emoji string
      specify icon emoji (unavailable for new Incoming Webhooks)
-interval duration
      interval (default 1s)
-slack-url string
      slack url (Incoming Webhooks URL)
-snippet
      switch to snippet uploading mode
-token string
      token (for uploading to snippet)
-username string
      specify username (unavailable for new Incoming Webhooks)
-version
      Print version information and quit

toml configuration file

By default check the following files.

1. a file specified with -c
2. $HOME/.notify_slack.toml
3. $HOME/etc/notify_slack.toml
4. /etc/notify_slack.toml

The contents of the toml file are as follows.

[slack]
url = "https://hooks.slack.com/services/**"
token = "xoxp-xxxxx"
channel = "#general"
username = "tester"
icon_emoji = ":rocket:"
interval = "1s"

Note:

• url is necessary if you want to post to slack as text.
  • You can specify channel, username, icon_emoji and interval.
  • Now, you cannot override channel, username, icon_emoji due to the specification change of Incoming Webhooks. Please refer to https://api.slack.com/messaging/webhooks#advanced_message_formatting
  • Incoming Webhooks url can be created on https://slack.com/services/new/incoming-webhook
• token and channel is necessary if you want to post to snippet.
  • username and icon_emoji are ignored in this case.
  • Please see the next section for how to create token.

Tips:

• If you want to default to another channel only for snippet, you can use snippet_channel.

How to create a token

You need to create a token if you use snippet uploading mode.

Create New App

At first, you need to create new app. Please access https://api.slack.com/apps.

1. click Create New App and click From scratch
2. input application name to App Name
3. select your workspace on Pick a workspace to develop your app in:
4. click Create App

Basic Information

1. click Permissions on Add features and functionality
2. select files:write on Scopes and click Save Changes. You are able to choose Bot Token Scopes or User Token Scopes

OAuth & Permissions

1. click Install to Workspace on OAuth Tokens for Your Workspace
2. install your app
3. copy OAuth Access Token beginning with xoxp- or Bot User OAuth Access Token beginning with xoxb-

Add apps

1. click channel name on the channel which you want to post
2. click Integrations and Add an App in Apps
3. choose your app

(Advanced) Environment Variables

Some settings can be given by the following environment variables.

NOTIFY_SLACK_WEBHOOK_URL
NOTIFY_SLACK_TOKEN
NOTIFY_SLACK_CHANNEL
NOTIFY_SLACK_SNIPPET_CHANNEL
NOTIFY_SLACK_USERNAME
NOTIFY_SLACK_ICON_EMOJI
NOTIFY_SLACK_INTERVAL

It will be useful if you want to use it on a container. If you use it, you don't need a configuration file anymore.