From 08221e3fa27396aca30cb539f006f78636782951 Mon Sep 17 00:00:00 2001
From: David Aguilar <davvid@gmail.com>
Date: Fri, 7 Oct 2016 16:58:04 -0700
Subject: mergetool: move main program flow into a main() function

Make it easier to follow the program's flow by isolating all
logic into functions.  Isolate the main execution code path into
a single unit instead of having prompt_after_failed_merge()
interrupt it partyway through.

The use of a main() function is borrowing a convention from C,
Python, Perl, and many other languages.  This helps readers more
familiar with other languages understand the purpose of each
function when diving into the codebase with fresh eyes.

Signed-off-by: David Aguilar <davvid@gmail.com>
Reviewed-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 300ce7f..b2cd0a4 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -366,51 +366,6 @@ merge_file () {
 	return 0
 }
 
-prompt=$(git config --bool mergetool.prompt)
-guessed_merge_tool=false
-
-while test $# != 0
-do
-	case "$1" in
-	--tool-help=*)
-		TOOL_MODE=${1#--tool-help=}
-		show_tool_help
-		;;
-	--tool-help)
-		show_tool_help
-		;;
-	-t|--tool*)
-		case "$#,$1" in
-		*,*=*)
-			merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
-			;;
-		1,*)
-			usage ;;
-		*)
-			merge_tool="$2"
-			shift ;;
-		esac
-		;;
-	-y|--no-prompt)
-		prompt=false
-		;;
-	--prompt)
-		prompt=true
-		;;
-	--)
-		shift
-		break
-		;;
-	-*)
-		usage
-		;;
-	*)
-		break
-		;;
-	esac
-	shift
-done
-
 prompt_after_failed_merge () {
 	while true
 	do
@@ -427,57 +382,108 @@ prompt_after_failed_merge () {
 	done
 }
 
-git_dir_init
-require_work_tree
+main () {
+	prompt=$(git config --bool mergetool.prompt)
+	guessed_merge_tool=false
+
+	while test $# != 0
+	do
+		case "$1" in
+		--tool-help=*)
+			TOOL_MODE=${1#--tool-help=}
+			show_tool_help
+			;;
+		--tool-help)
+			show_tool_help
+			;;
+		-t|--tool*)
+			case "$#,$1" in
+			*,*=*)
+				merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
+				;;
+			1,*)
+				usage ;;
+			*)
+				merge_tool="$2"
+				shift ;;
+			esac
+			;;
+		-y|--no-prompt)
+			prompt=false
+			;;
+		--prompt)
+			prompt=true
+			;;
+		--)
+			shift
+			break
+			;;
+		-*)
+			usage
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done
+
+	git_dir_init
+	require_work_tree
 
-if test -z "$merge_tool"
-then
-	# Check if a merge tool has been configured
-	merge_tool=$(get_configured_merge_tool)
-	# Try to guess an appropriate merge tool if no tool has been set.
 	if test -z "$merge_tool"
 	then
-		merge_tool=$(guess_merge_tool) || exit
-		guessed_merge_tool=true
+		# Check if a merge tool has been configured
+		merge_tool=$(get_configured_merge_tool)
+		# Try to guess an appropriate merge tool if no tool has been set.
+		if test -z "$merge_tool"
+		then
+			merge_tool=$(guess_merge_tool) || exit
+			guessed_merge_tool=true
+		fi
 	fi
-fi
-merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
-merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
-
-files=
+	merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
+	merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 
-if test $# -eq 0
-then
-	cd_to_toplevel
+	files=
 
-	if test -e "$GIT_DIR/MERGE_RR"
+	if test $# -eq 0
 	then
-		files=$(git rerere remaining)
+		cd_to_toplevel
+
+		if test -e "$GIT_DIR/MERGE_RR"
+		then
+			files=$(git rerere remaining)
+		else
+			files=$(git ls-files -u |
+				sed -e 's/^[^	]*	//' | sort -u)
+		fi
 	else
-		files=$(git ls-files -u | sed -e 's/^[^	]*	//' | sort -u)
+		files=$(git ls-files -u -- "$@" |
+			sed -e 's/^[^	]*	//' | sort -u)
 	fi
-else
-	files=$(git ls-files -u -- "$@" | sed -e 's/^[^	]*	//' | sort -u)
-fi
-
-if test -z "$files"
-then
-	echo "No files need merging"
-	exit 0
-fi
-
-printf "Merging:\n"
-printf "%s\n" "$files"
-
-rc=0
-for i in $files
-do
-	printf "\n"
-	if ! merge_file "$i"
+
+	if test -z "$files"
 	then
-		rc=1
-		prompt_after_failed_merge || exit 1
+		echo "No files need merging"
+		exit 0
 	fi
-done
 
-exit $rc
+	printf "Merging:\n"
+	printf "%s\n" "$files"
+
+	rc=0
+	for i in $files
+	do
+		printf "\n"
+		if ! merge_file "$i"
+		then
+			rc=1
+			prompt_after_failed_merge || exit 1
+		fi
+	done
+
+	exit $rc
+}
+
+main "$@"
-- 
cgit v0.10.2-6-g49f6