Instead of needing a wrapper to call the diff/merge command, simply
provide the diff_cmd and merge_cmd functions for user-specified tools in
the same way as we do for built-in tools.

Signed-off-by: John Keeping <j...@keeping.me.uk>
---
 git-mergetool--lib.sh | 82 ++++++++++++++++++++++-----------------------------
 1 file changed, 35 insertions(+), 47 deletions(-)

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index e338be5..6a72106 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -114,6 +114,33 @@ valid_tool () {
        test -n "$cmd"
 }
 
+setup_user_tool () {
+       merge_tool_cmd=$(get_merge_tool_cmd "$tool")
+       test -n "$merge_tool_cmd" || return 1
+
+       diff_cmd () {
+               ( eval $merge_tool_cmd )
+               status=$?
+               return $status
+       }
+
+       merge_cmd () {
+               trust_exit_code=$(git config --bool \
+                       "mergetool.$1.trustExitCode" || echo false)
+               if test "$trust_exit_code" = "false"
+               then
+                       touch "$BACKUP"
+                       ( eval $merge_tool_cmd )
+                       status=$?
+                       check_unchanged
+               else
+                       ( eval $merge_tool_cmd )
+                       status=$?
+               fi
+               return $status
+       }
+}
+
 setup_tool () {
        tool="$1"
 
@@ -142,15 +169,15 @@ setup_tool () {
 
        if ! test -f "$MERGE_TOOLS_DIR/$tool"
        then
-               # Use a special return code for this case since we want to
-               # source "defaults" even when an explicit tool path is
-               # configured since the user can use that to override the
-               # default path in the scriptlet.
-               return 2
+               setup_user_tool
+               return $?
        fi
 
        # Load the redefined functions
        . "$MERGE_TOOLS_DIR/$tool"
+       # Now let the user override the default command for the tool.  If
+       # they have not done so then this will return 1 which we ignore.
+       setup_user_tool
 
        if merge_mode && ! can_merge
        then
@@ -187,20 +214,7 @@ run_merge_tool () {
        status=0
 
        # Bring tool-specific functions into scope
-       setup_tool "$1"
-       exitcode=$?
-       case $exitcode in
-       0)
-               :
-               ;;
-       2)
-               # The configured tool is not a built-in tool.
-               test -n "$merge_tool_path" || return 1
-               ;;
-       *)
-               return $exitcode
-               ;;
-       esac
+       setup_tool "$1" || return 1
 
        if merge_mode
        then
@@ -213,38 +227,12 @@ run_merge_tool () {
 
 # Run a either a configured or built-in diff tool
 run_diff_cmd () {
-       merge_tool_cmd=$(get_merge_tool_cmd "$1")
-       if test -n "$merge_tool_cmd"
-       then
-               ( eval $merge_tool_cmd )
-               status=$?
-               return $status
-       else
-               diff_cmd "$1"
-       fi
+       diff_cmd "$1"
 }
 
 # Run a either a configured or built-in merge tool
 run_merge_cmd () {
-       merge_tool_cmd=$(get_merge_tool_cmd "$1")
-       if test -n "$merge_tool_cmd"
-       then
-               trust_exit_code=$(git config --bool \
-                       "mergetool.$1.trustExitCode" || echo false)
-               if test "$trust_exit_code" = "false"
-               then
-                       touch "$BACKUP"
-                       ( eval $merge_tool_cmd )
-                       status=$?
-                       check_unchanged
-               else
-                       ( eval $merge_tool_cmd )
-                       status=$?
-               fi
-               return $status
-       else
-               merge_cmd "$1"
-       fi
+       merge_cmd "$1"
 }
 
 list_merge_tool_candidates () {
-- 
1.8.3.779.g691e267

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