git - set KDiff3 as default mergetool

Question

After installing KDiff3 for managing conflicts in git, still the default one is opening for me:

Here is the configuration that mentioned in this answer:

git config --global --add merge.tool kdiff3
git config --global --add mergetool.kdiff3.path "C:/Program Files/KDiff3/kdiff3.exe"
git config --global --add mergetool.kdiff3.trustExitCode false

git config --global --add diff.guitool kdiff3
git config --global --add difftool.kdiff3.path "C:/Program Files/KDiff3/kdiff3.exe"
git config --global --add difftool.kdiff3.trustExitCode false

NOTE: I can be able to run KDiff3 individually with simple files, but I can't run it in my git project. Any idea?

Edit: Here is my .gitconfig :

[user]
    email = [e-mail]
    name = vahid najafi
[diff]
    tool = kdiff3
    guitool = kdiff3
[merge]
    tool = diffmerge
    tool = kdiff3
    tool = kdiff3
[mergetool "diffmerge"]
    trustExitCode = true
[mergetool "kdiff3"]
    path = C:/Program Files/KDiff3/kdiff3.exe
    trustExitCode = false
[difftool "kdiff3"]
    path = C:/Program Files/KDiff3/kdiff3.exe
    trustExitCode = false

Answer 1

I do not know kdiff3, but you might need to add the files you want to compare to your tool call as parameters (see command line options for KDiff3 call here). In your global config (accessible via git config --global -e), the respective lines should look something like this:

[merge]
    tool = kdiff3
[mergetool "kdiff3"]
    trustExitCode = false
    cmd = 'C:/Program Files/KDiff3/kdiff3.exe' "$LOCAL" "$BASE" "$REMOTE" "$MERGED"

Since I did not try this with KDiff3, you might have to switch the order of "$LOCAL" "$BASE" "$REMOTE"and "$MERGED" variables, but this post sould provide enough additional more information on this. Although it's about the Meld tool, I'm pretty sure the handling is analogical, and there are some pretty good and informative answers.

EDIT: Assuming you use windows: You can just locate it in Windows explorer, usually in c:\user\yourusername\.gitconfig, and open it with any editor. In Linux, see this post. Then, replace all the merge, mergetooland difftool sections with the following:

[merge]
    tool = kdiff3
[mergetool "kdiff3"]
    cmd = "C:/Program Files/KDiff3/kdiff3.exe" "$LOCAL" "$BASE" "$REMOTE" "$MERGED"
    trustExitCode = false
[difftool "kdiff3"]
    cmd = "C:/Program Files/KDiff3/kdiff3.exe" "$LOCAL" "$BASE" "$REMOTE" "$MERGED"
    trustExitCode = false

If ot does not work, it is possible that you have to change the order of "$LOCAL" "$BASE" "$REMOTE"and "$MERGED" variables or remove one of them. You can find sufficient information about this in the links provided above.

Answer 2

Finally I made another solution! I used meld instead of kdiff3. First download meld from here. Then change config for meld in c:/Users/yourName/.gitconfig :

[user]
    email = [e-mail]
    name = vahid najafi
[diff]
    tool = meld
[difftool "meld"]
    path = C:/Program Files (x86)/Meld/meld/meld.exe
[difftool]
    prompt = false
[merge]
    tool = meld
[mergetool "meld"]
    path = C:/Program Files (x86)/Meld/meld/meld.exe
[mergetool]
    keepBackup = false

NOTE: Try to use git cmd instead of windows cmd. When you have conflict, just run : git mergetool. For more detail and example, see here.