mjhjmtu

I am writting git hook file. I have following condition:

current_branch_name=$(echo $(git branch | grep "*" | sed "s;* ;;"))
merged_branch_name=$(echo $(git reflog -1) | cut -d" " -f 4 | sed "s;:;;")
release_branch_name="release"
develop_branch_name="develop"
master_branch_name="master"
hotfix_branch_name="hotfix/*"

if [[ ($current_branch_name == $release_branch_name && $merged_branch_name == $develop_branch_name) 
 || ($current_branch_name == $master_branch_name && $merged_branch_name == $hotfix_branch_name) ]] ; then
#do something
fi

I would like to move conditions from if statement into a variable. I've done:

current_branch_name=$(echo $(git branch | grep "*" | sed "s;* ;;"))
merged_branch_name=$(echo $(git reflog -1) | cut -d" " -f 4 | sed "s;:;;")
release_branch_name="release"
develop_branch_name="develop"
master_branch_name="master"
hotfix_branch_name="hotfix/*"
is_merge_from_develop_to_release=$(($current_branch_name == $release_branch_name && $merged_branch_name == $develop_branch_name))
is_merge_from_hotfix_to_master=$(($current_branch_name == $master_branch_name && $merged_branch_name == $hotfix_branch_name))

if [[ $is_merge_from_develop_to_release || $is_merge_from_hotfix_to_master ]] ; then
#do something
fi

It gives me an error for hotfix/*, but it works if the entire condition is stuffed in the if statement.
How can properly decouple conditions from if ?

EDITED (final version):

function checkBranches sed "s;:;;")
 hotfix_branch_name="hotfix/*"

 [[ $current_branch == "release" && 
 $merged_branch == "develop" ]] && return 0
 [[ $current_branch == "master" &&
 $merged_branch == $hotfix_branch_name ]] && return 0
 return 1


if checkBranches ; then
#do something
fi

Not really saving you lines but you could use a function:

check_branch () sed "s;* ;;"))
 local merged_branch=$(echo $(git reflog -1) 

if check_branch; then
 #something
fi

Will your branch names change frequently? If not it would make more sense just to compare the variables against the strings: release, develop, master, hotfix/*.

case $(git branch |sed -nes/* //p
)$( git -reflog 1|cut -d -f4
) in release:develop
| master:hotfix/*
) : hooray!
esac

With $(( )) you can do arithmetic, it is not for string comparisons.

In general, you can convert

if cmd; then ...

to

var=$(cmd; echo $?)
if [[ $var ]]; then

This will execute cmd and then echo the return status of cmd, assigning it to var.