shell portability problems: dash not supported

[threepistons]

I have version 0.2.3 and I'm using Ubuntu 18.04 with sh symlinked to dash. When I run git fire against a repo with a stash, the stash isn't branched and pushed.

~/git/test(master) » git fire
Switched to a new branch 'fire-master-redacted@example.com-1543921496'
On branch fire-master-redacted@example.com-1543921496
nothing to commit, working tree clean
Host key fingerprint is SHA256:UFAjDQH4wwzmGkeNYpztD5NuaIBVkrdFIuoaEN4vCVQ
+---[ECDSA 256]---+
|o.*E+o**+        |
|+*X+o..o..       |
|=O.B.o.          |
|* +=O  .         |
|o=oo+o  S        |
|o+ o..           |
|o .              |
|                 |
|                 |
+----[SHA256]-----+
X11 forwarding request failed on channel 0
Total 0 (delta 0), reused 0 (delta 0)
To gitlab.example.com:sample/test.git
 * [new branch]      fire-master-redacted@example.com-1543921496 -> fire-master-redacted@example.com-1543921496
Branch 'fire-master-redacted@example.com-1543921496' set up to track remote branch 'fire-master-redacted@example.com-1543921496' from 'origin'.
/usr/local/bin/git-fire: 51: /usr/local/bin/git-fire: [[: not found

I can silence the error and push the stash by editing /usr/local/lib/mode_modules/git-fire/git-fire to replace the first line (#!/usr/bin/env sh) with either #!/usr/bin/env bash or #!/usr/bin/env zsh. I suspect that dash's lack of support for [[ causes this and it will affect other users of Debian-like distros.

[glensc]

fixes provided several times, merge capable developer, like @qw3rtman not responding

• code style ocd #39
• Use [ instead of bash-specific [[ for test #34

[qw3rtman]

Merged #34, fixing this issue.