Add support for build tags

[qaisjp]

[gitter] I see. Thank you. Is it possible to make a build choosing with platforms to support? (just curious)

This feature makes that possible. I just want to see if I could do it, I don't really care about this being merged, but it works if you want it!

By default all bridges are available.

You can turn off certain bridges by providing
e.g. "withoutdiscord" as a build tag.

go build -tags withoutmsteams,withoutapi

Example config

(simple with just discord, slack and telegram)

[telegram]
[telegram.test]
Token="tok"
RemoteNickFormat="[{PROTOCOL}] <{NICK}> "

[discord]
[discord.mta]
Token="tok"
Server="id"
RemoteNickFormat="{NICK}"
WebhookURL="tok"
ShowEmbeds=true

[slack]
[slack.mta]
Token="tok"
RemoteNickFormat="{NICK}"

[[gateway]]
name="mta.test"
enable=true

[[gateway.inout]]
account="slack.mta"
channel="test"

[[gateway.inout]]
account="discord.mta"
channel="test"

[[gateway.inout]]
account="telegram.test"
channel="-411596043"

Example: without discord

➜ go build -tags withoutdiscord
➜ ./matterbridge -debug
[0000]  INFO main:         Enabling debug logging.
[0000]  INFO main:         Running version 1.17.1-dev
[0000]  INFO main:         WARNING: THIS IS A DEVELOPMENT VERSION. Things may break.
[0000] FATAL gateway:      Incorrect protocol discord specified in gateway configuration discord.mta, exiting.

Example: size with/without msteams

➜ go build
➜ ls -lah matterbridge
-rwxr-xr-x  1 qaisjp  staff    61M 22 Mar 04:45 matterbridge

➜ go build --tags withoutmsteams
➜ ls -lah matterbridge
-rwxr-xr-x  1 qaisjp  staff    34M 22 Mar 04:45 matterbridge

Example: without any tags

➜ go build
➜ ./matterbridge
[2020-03-22T04:46:31Z]  INFO main:         Running version 1.17.1-dev
[2020-03-22T04:46:31Z]  INFO main:         WARNING: THIS IS A DEVELOPMENT VERSION. Things may break.
[2020-03-22T04:46:31Z]  INFO router:       Parsing gateway mta.test
[2020-03-22T04:46:31Z]  INFO router:       Starting bridge: discord.mta
[2020-03-22T04:46:31Z]  INFO discord:      Connecting
[2020-03-22T04:46:31Z]  INFO discord:      Connecting using webhookurl (for posting) and token
[2020-03-22T04:46:31Z]  INFO discord:      Connection succeeded
[2020-03-22T04:46:32Z]  INFO discord:      Can manage webhooks; will edit channel for global webhook on send
[2020-03-22T04:46:33Z]  INFO discord:      discord.mta: joining test (ID: testdiscord.mta)
[2020-03-22T04:46:33Z]  INFO router:       Starting bridge: telegram.test
[2020-03-22T04:46:33Z]  INFO telegram:     Connecting
[2020-03-22T04:46:33Z]  INFO telegram:     Connection succeeded
[2020-03-22T04:46:33Z]  INFO telegram:     telegram.test: joining -411596043 (ID: -411596043telegram.test)
[2020-03-22T04:46:33Z]  INFO router:       Starting bridge: slack.mta
[2020-03-22T04:46:33Z]  INFO slack:        Connecting using token
[2020-03-22T04:46:33Z]  INFO slack:        slack.mta: joining test (ID: testslack.mta)
[2020-03-22T04:46:33Z]  INFO main:         Gateway(s) started succesfully. Now relaying messages

[42wim]

It's a good idea and gives people easy options to exclude stuff, with msteams we now also need 1.5GB ram to build.
I've added a linter exclude for the bridgemap, could you rebase on master ?

[qaisjp]

Rebased! Also, I'm not sure if withoutdiscord or nodiscord is preferred

[42wim]

I think "no" is better. You ok with rebasing once more with that change?

[qaisjp]

Yes, done!

[qaisjp]

Wait, I need to change commit message