[PATCH v9 1/3] parse-options.c: make OPTION__COUNTUP consider negative values

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The reason to make it consider negative values or more specifically
"unspecified" values is to give the ability to differentiate between
once, multiple time or with --no-option.

Eg. :
initialize verbose = -1
`git commit` => verbose = -1
`git commit -v` => verbose = 1
`git commit -v -v` => verbose = 2
`git commit --no-verbose` => verbose = 0

Signed-off-by: Pranit Bauva <pranit.bauva@xxxxxxxxx>

---
The discussion about this patch:
[1] : http://thread.gmane.org/gmane.comp.version-control.git/289027

Previous version of the patch:
[v1] : http://thread.gmane.org/gmane.comp.version-control.git/289061

Changes introduced:
Use a different language in commit message to make the change and its
utility more clear.
---
 Documentation/technical/api-parse-options.txt | 6 ++++--
 parse-options.c                               | 8 +++++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/technical/api-parse-options.txt b/Documentation/technical/api-parse-options.txt
index 5f0757d..a908d8a 100644
--- a/Documentation/technical/api-parse-options.txt
+++ b/Documentation/technical/api-parse-options.txt
@@ -144,8 +144,10 @@ There are some macros to easily define options:
 
 `OPT_COUNTUP(short, long, &int_var, description)`::
 	Introduce a count-up option.
-	`int_var` is incremented on each use of `--option`, and
-	reset to zero with `--no-option`.
+	If the `int_var` is negative and `--option` is absent,
+	then it will retain its value. Otherwise it will first set
+	`int_var` to 0 and then increment it on each use of `--option`,
+	and reset to zero with `--no-option`.
 
 `OPT_BIT(short, long, &int_var, description, mask)`::
 	Introduce a boolean option.
diff --git a/parse-options.c b/parse-options.c
index 47a9192..86d30bd 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -110,7 +110,13 @@ static int get_value(struct parse_opt_ctx_t *p,
 		return 0;
 
 	case OPTION_COUNTUP:
-		*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
+		if (unset)
+			*(int *)opt->value = 0;
+		else {
+			if (*(int *)opt->value < 0)
+				*(int *)opt->value = 0;
+			*(int *)opt->value += 1;
+		}
 		return 0;
 
 	case OPTION_SET_INT:

--
https://github.com/git/git/pull/218
--
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