[PATCH v3 3/3] test-lib-functions: optionally keep HOME and TERM in 'debug'

["Philippe Blain via GitGitGadget" <gitgitgadget@gmail.com>]

From: Philippe Blain <levraiphilippeblain@gmail.com>

The 'debug' function in test-lib-functions.sh is used to invoke a
debugger at a specific line in a test. It inherits the value of HOME and
TERM set by 'test-lib.sh': HOME="$TRASH_DIRECTORY" and TERM=dumb.

Changing the value of HOME means that any customization configured in a
developers' debugger configuration file (like $HOME/.gdbinit or
$HOME/.lldbinit) are not available in the debugger invoked by
'test_pause'.

Changing the value of TERM to 'dumb' means that colored output
is disabled in the debugger.

To make the debugging experience with 'debug' more pleasant, leverage
the variables USER_HOME and USER_TERM, added in the previous commit, to
optionally set HOME and TERM before invoking the debugger.

Add the same warnings as for 'test_pause' in the "Usage" section.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
---
 t/test-lib-functions.sh | 60 +++++++++++++++++++++++++++++++----------
 1 file changed, 46 insertions(+), 14 deletions(-)

diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 4b667dc7e76..537fd88e686 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -187,25 +187,57 @@ test_pause () {
 # Wrap git with a debugger. Adding this to a command can make it easier
 # to understand what is going on in a failing test.
 #
+# Usage: debug [options] [git command]
+#   -d <debugger>
+#   --debugger=<debugger>
+#	Use <debugger> instead of GDB
+#   -t
+#	Use your original TERM instead of test-lib.sh's "dumb".
+#	This usually restores color output in the debugger.
+#	WARNING: this can break test reproducibility.
+#   -h
+#	Use your original HOME instead of test-lib.sh's "$TRASH_DIRECTORY".
+#	This allows your debugger to find its config file in your home.
+#	WARNING: this can break test reproducibility.
+#	CAUTION: this can overwrite files in your HOME.
+#   -a
+#	Shortcut for -t -h
+#
 # Examples:
 #     debug git checkout master
 #     debug --debugger=nemiver git $ARGS
 #     debug -d "valgrind --tool=memcheck --track-origins=yes" git $ARGS
 debug () {
-	case "$1" in
-	-d)
-		GIT_DEBUGGER="$2" &&
-		shift 2
-		;;
-	--debugger=*)
-		GIT_DEBUGGER="${1#*=}" &&
-		shift 1
-		;;
-	*)
-		GIT_DEBUGGER=1
-		;;
-	esac &&
-	GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
+	GIT_DEBUGGER=1 &&
+	DEBUG_TERM=$TERM &&
+	DEBUG_HOME=$HOME &&
+	while test $# != 0
+	do
+		case "$1" in
+		-t)
+			DEBUG_TERM="$USER_TERM"
+			;;
+		-h)
+			DEBUG_HOME="$USER_HOME"
+			;;
+		-a)
+			DEBUG_TERM="$USER_TERM"
+			DEBUG_HOME="$USER_HOME"
+			;;
+		-d)
+			GIT_DEBUGGER="$2" &&
+			shift
+			;;
+		--debugger=*)
+			GIT_DEBUGGER="${1#*=}"
+			;;
+		*)
+			break
+			;;
+		esac
+		shift
+	done &&
+	TERM="$DEBUG_TERM" HOME="$DEBUG_HOME" GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
 }
 
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