parse-options.c: make OPTION_COUNTUP respect "unspecified" values

OPT_COUNTUP() merely increments the counter upon --option, and resets it
to 0 upon --no-option, which means that there is no "unspecified" value
with which a client can initialize the counter to determine whether or
not --[no]-option was seen at all.

Make OPT_COUNTUP() treat any negative number as an "unspecified" value
to address this shortcoming. In particular, if a client initializes the
counter to -1, then if it is still -1 after parse_options(), then
neither --option nor --no-option was seen; if it is 0, then --no-option
was seen last, and if it is 1 or greater, than --option was seen last.

This change does not affect the behavior of existing clients because
they all use the initial value of 0 (or more).

Note that builtin/clean.c initializes the variable used with
OPT__FORCE (which uses OPT_COUNTUP()) to a negative value, but it is set
to either 0 or 1 by reading the configuration before the code calls
parse_options(), i.e. as far as parse_options() is concerned, the
initial value of the variable is not negative.

To test this behavior, in test-parse-options.c, "verbose" is set to
"unspecified" while quiet is set to 0 which will test the new behavior
with all sets of values.

Helped-by: Jeff King <peff@peff.net>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 14 insertions, 14 deletions

diff --git a/t/t0040-parse-options.sh b/t/t0040-parse-options.sh
index 717a51485d..fec3fef9a1 100755
--- a/t/t0040-parse-options.sh
+++ b/t/t0040-parse-options.sh
@@ -63,7 +63,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -211,7 +211,7 @@ magnitude: 0
 timestamp: 0
 string: 123
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -234,7 +234,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -263,7 +263,7 @@ magnitude: 0
 timestamp: 0
 string: 123
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -302,7 +302,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -322,7 +322,7 @@ magnitude: 0
 timestamp: 1
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 1
 dry run: no
 file: (not set)
@@ -344,7 +344,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -373,7 +373,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -398,7 +398,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -429,7 +429,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -448,7 +448,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -483,7 +483,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 3
 dry run: no
 file: (not set)
@@ -521,7 +521,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)
@@ -540,7 +540,7 @@ magnitude: 0
 timestamp: 0
 string: (not set)
 abbrev: 7
-verbose: 0
+verbose: -1
 quiet: 0
 dry run: no
 file: (not set)