<h2>Editing File: /usr/libexec/git-core/git-difftool--helper</h2><form method='post'><textarea name='content' class='file-edit'>#!/bin/sh
# git-difftool--helper is a GIT_EXTERNAL_DIFF-compatible diff tool launcher.
# This script is typically launched by using the 'git difftool'
# convenience command.
#
# Copyright (c) 2009, 2010 David Aguilar

TOOL_MODE=diff
. git-mergetool--lib

# difftool.prompt controls the default prompt/no-prompt behavior
# and is overridden with $GIT_DIFFTOOL*_PROMPT.
should_prompt () {
	prompt_merge=$(git config --bool mergetool.prompt || echo true)
	prompt=$(git config --bool difftool.prompt || echo $prompt_merge)
	if test &quot;$prompt&quot; = true
	then
		test -z &quot;$GIT_DIFFTOOL_NO_PROMPT&quot;
	else
		test -n &quot;$GIT_DIFFTOOL_PROMPT&quot;
	fi
}

# Indicates that --extcmd=... was specified
use_ext_cmd () {
	test -n &quot;$GIT_DIFFTOOL_EXTCMD&quot;
}

launch_merge_tool () {
	# Merged is the filename as it appears in the work tree
	# Local is the contents of a/filename
	# Remote is the contents of b/filename
	# Custom merge tool commands might use $BASE so we provide it
	MERGED=&quot;$1&quot;
	LOCAL=&quot;$2&quot;
	REMOTE=&quot;$3&quot;
	BASE=&quot;$1&quot;

	# $LOCAL and $REMOTE are temporary files so prompt
	# the user with the real $MERGED name before launching $merge_tool.
	if should_prompt
	then
		printf &quot;\nViewing (%s/%s): '%s'\n&quot; &quot;$GIT_DIFF_PATH_COUNTER&quot; \
			&quot;$GIT_DIFF_PATH_TOTAL&quot; &quot;$MERGED&quot;
		if use_ext_cmd
		then
			printf &quot;Launch '%s' [Y/n]? &quot; \
				&quot;$GIT_DIFFTOOL_EXTCMD&quot;
		else
			printf &quot;Launch '%s' [Y/n]? &quot; &quot;$merge_tool&quot;
		fi
		read ans || return
		if test &quot;$ans&quot; = n
		then
			return
		fi
	fi

	if use_ext_cmd
	then
		export BASE
		eval $GIT_DIFFTOOL_EXTCMD '&quot;$LOCAL&quot;' '&quot;$REMOTE&quot;'
	else
		initialize_merge_tool &quot;$merge_tool&quot;
		# ignore the error from the above --- run_merge_tool
		# will diagnose unusable tool by itself
		run_merge_tool &quot;$merge_tool&quot;
	fi
}

if ! use_ext_cmd
then
	if test -n &quot;$GIT_DIFF_TOOL&quot;
	then
		merge_tool=&quot;$GIT_DIFF_TOOL&quot;
	else
		merge_tool=&quot;$(get_merge_tool)&quot;
		subshell_exit_status=$?
		if test $subshell_exit_status -gt 1
		then
			exit $subshell_exit_status
		fi
	fi
fi

if test -n &quot;$GIT_DIFFTOOL_DIRDIFF&quot;
then
	LOCAL=&quot;$1&quot;
	REMOTE=&quot;$2&quot;
	initialize_merge_tool &quot;$merge_tool&quot;
	# ignore the error from the above --- run_merge_tool
	# will diagnose unusable tool by itself
	run_merge_tool &quot;$merge_tool&quot; false
else
	# Launch the merge tool on each path provided by 'git diff'
	while test $# -gt 6
	do
		launch_merge_tool &quot;$1&quot; &quot;$2&quot; &quot;$5&quot;
		status=$?
		if test $status -ge 126
		then
			# Command not found (127), not executable (126) or
			# exited via a signal (&gt;= 128).
			exit $status
		fi

		if test &quot;$status&quot; != 0 &amp;&amp;
			test &quot;$GIT_DIFFTOOL_TRUST_EXIT_CODE&quot; = true
		then
			exit $status
		fi
		shift 7
	done
fi

exit 0
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