intellij as diff and mergetool

Setup idea script

First, you need to set up idea script by following the instruction here

If you are using mac, make sure you add -W on the open script as follows (see this issue)

open -Wna "IntelliJ IDEA.app" --args "$@"

setup git difftool & mergetool

Taken from https://gist.github.com/rambabusaravanan/1d1902e599c9c680319678b0f7650898#gistcomment-2132894

open .git/config (or your global gitconfig file)

[merge]
    tool = intellij
[mergetool "intellij"]
    cmd = idea merge $(cd $(dirname "$LOCAL") && pwd)/$(basename "$LOCAL") $(cd $(dirname "$REMOTE") && pwd)/$(basename "$REMOTE") $(cd $(dirname "$BASE") && pwd)/$(basename "$BASE") $(cd $(dirname "$MERGED") && pwd)/$(basename "$MERGED")
    trustExitCode = true
[diff]
    tool = intellij
[difftool "intellij"]
    cmd = idea diff $(cd $(dirname "$LOCAL") && pwd)/$(basename "$LOCAL") $(cd $(dirname "$REMOTE") && pwd)/$(basename "$REMOTE")

Explanation about LOCAL, REMOTE, BASE from stackoverflow

• foo.LOCAL: the "ours" side of the conflict - ie, your branch (HEAD) that will contain the results of the merge

• foo.REMOTE: the "theirs" side of the conflict - the branch you are merging into HEAD

• foo.BASE: the common ancestor. useful for feeding into a three-way merge tool

• foo.BACKUP: the contents of file before invoking the merge tool, will be kept on the filesystem if mergetool.keepBackup = true.

idea merge syntax

idea merge <path1> <path2> [<base>] <output>