strvec: rename struct fields

The "argc" and "argv" names made sense when the struct was argv_array,
but now they're just confusing. Let's rename them to "nr" (which we use
for counts elsewhere) and "v" (which is rather terse, but reads well
when combined with typical variable names like "args.v").

Note that we have to update all of the callers immediately. Playing
tricks with the preprocessor is hard here, because we wouldn't want to
rewrite unrelated tokens.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

strvec.h

@@ -2,10 +2,10 @@
 #define STRVEC_H
 
 /**
- * The argv-array API allows one to dynamically build and store
- * NULL-terminated lists.  An argv-array maintains the invariant that the
- * `argv` member always points to a non-NULL array, and that the array is
- * always NULL-terminated at the element pointed to by `argv[argc]`. This
+ * The strvec API allows one to dynamically build and store
+ * NULL-terminated arrays of strings. A strvec maintains the invariant that the
+ * `items` member always points to a non-NULL array, and that the array is
+ * always NULL-terminated at the element pointed to by `items[nr]`. This
  * makes the result suitable for passing to functions expecting to receive
  * argv from main().
  *
@@ -22,15 +22,15 @@ extern const char *empty_strvec[];
 
 /**
  * A single array. This should be initialized by assignment from
- * `STRVEC_INIT`, or by calling `strvec_init`. The `argv`
- * member contains the actual array; the `argc` member contains the
+ * `STRVEC_INIT`, or by calling `strvec_init`. The `items`
+ * member contains the actual array; the `nr` member contains the
  * number of elements in the array, not including the terminating
  * NULL.
  */
 struct strvec {
-	const char **argv;
-	size_t argc;
-	size_t alloc;
+	const char **v;
+	int nr;
+	int alloc;
 };
 
 #define STRVEC_INIT { empty_strvec, 0, 0 }
@@ -78,7 +78,7 @@ void strvec_split(struct strvec *, const char *);
 void strvec_clear(struct strvec *);
 
 /**
- * Disconnect the `argv` member from the `strvec` struct and
+ * Disconnect the `items` member from the `strvec` struct and
  * return it. The caller is responsible for freeing the memory used
  * by the array, and by the strings it references. After detaching,
  * the `strvec` is in a reinitialized state and can be pushed