Typedef git_config_level_t and use it everywhere

The GIT_CONFIG_LEVEL constants actually work well as an enum
because they are mutually exclusive, so this adds a typedef to
the enum and uses that everywhere that one of these constants are
expected, instead of the old code that typically used an unsigned
int.

include/git2/config.h

@@ -27,18 +27,33 @@ GIT_BEGIN_DECL
  * git_config_open_default() and git_repository_config() honor those
  * priority levels as well.
  */
-enum {
-	GIT_CONFIG_LEVEL_SYSTEM = 1,	/**< System-wide configuration file. */
-	GIT_CONFIG_LEVEL_XDG = 2,		/**< XDG compatible configuration file (.config/git/config). */
-	GIT_CONFIG_LEVEL_GLOBAL = 3,	/**< User-specific configuration file, also called Global configuration file. */
-	GIT_CONFIG_LEVEL_LOCAL = 4,		/**< Repository specific configuration file. */
-	GIT_CONFIG_HIGHEST_LEVEL = -1,	/**< Represents the highest level of a config file. */
-};
+typedef enum {
+	/** System-wide configuration file; /etc/gitconfig on Linux systems */
+	GIT_CONFIG_LEVEL_SYSTEM = 1,
+
+	/** XDG compatible configuration file; typically ~/.config/git/config */
+	GIT_CONFIG_LEVEL_XDG = 2,
+
+	/** User-specific configuration file (also called Global configuration
+	 * file); typically ~/.gitconfig
+	 */
+	GIT_CONFIG_LEVEL_GLOBAL = 3,
+
+	/** Repository specific configuration file; $WORK_DIR/.git/config on
+	 * non-bare repos
+	 */
+	GIT_CONFIG_LEVEL_LOCAL = 4,
+
+	/** Represents the highest level available config file (i.e. the most
+	 * specific config file available that actually is loaded)
+	 */
+	GIT_CONFIG_HIGHEST_LEVEL = -1,
+} git_config_level_t;
 
 typedef struct {
 	const char *name;
 	const char *value;
-	unsigned int level;
+	git_config_level_t level;
 } git_config_entry;
 
 typedef int  (*git_config_foreach_cb)(const git_config_entry *, void *);
@@ -155,7 +170,7 @@ GIT_EXTERN(int) git_config_new(git_config **out);
 GIT_EXTERN(int) git_config_add_file_ondisk(
 	git_config *cfg,
 	const char *path,
-	unsigned int level,
+	git_config_level_t level,
 	int force);
 
 /**
@@ -192,7 +207,7 @@ GIT_EXTERN(int) git_config_open_ondisk(git_config **out, const char *path);
 GIT_EXTERN(int) git_config_open_level(
 	git_config **out,
 	const git_config *parent,
-	unsigned int level);
+	git_config_level_t level);
 
 /**
  * Open the global/XDG configuration file according to git's rules

include/git2/sys/config.h

@@ -29,7 +29,7 @@ struct git_config_backend {
 	struct git_config *cfg;
 
 	/* Open means open the file/database and parse if necessary */
-	int (*open)(struct git_config_backend *, unsigned int level);
+	int (*open)(struct git_config_backend *, git_config_level_t level);
 	int (*get)(const struct git_config_backend *, const char *key, const git_config_entry **entry);
 	int (*get_multivar)(struct git_config_backend *, const char *key, const char *regexp, git_config_foreach_cb callback, void *payload);
 	int (*set)(struct git_config_backend *, const char *key, const char *value);
@@ -63,7 +63,7 @@ struct git_config_backend {
 GIT_EXTERN(int) git_config_add_backend(
 	git_config *cfg,
 	git_config_backend *file,
-	unsigned int level,
+	git_config_level_t level,
 	int force);
 
 /** @} */

src/config.c

@@ -23,7 +23,7 @@ typedef struct {
 	git_refcount rc;
 
 	git_config_backend *file;
-	unsigned int level;
+	git_config_level_t level;
 } file_internal;
 
 static void file_internal_free(file_internal *internal)
@@ -87,7 +87,7 @@ int git_config_new(git_config **out)
 int git_config_add_file_ondisk(
 	git_config *cfg,
 	const char *path,
-	unsigned int level,
+	git_config_level_t level,
 	int force)
 {
 	git_config_backend *file = NULL;
@@ -138,11 +138,11 @@ int git_config_open_ondisk(git_config **out, const char *path)
 static int find_internal_file_by_level(
 	file_internal **internal_out,
 	const git_config *cfg,
-	int level)
+	git_config_level_t level)
 {
 	int pos = -1;
 	file_internal *internal;
-	unsigned int i;
+	size_t i;
 
 	/* when passing GIT_CONFIG_HIGHEST_LEVEL, the idea is to get the config file
 	 * which has the highest level. As config files are stored in a vector
@@ -153,14 +153,14 @@ static int find_internal_file_by_level(
 		pos = 0;
 	} else {
 		git_vector_foreach(&cfg->files, i, internal) {
-			if (internal->level == (unsigned int)level)
+			if (internal->level == level)
 				pos = i;
 		}
 	}
 
 	if (pos == -1) {
 		giterr_set(GITERR_CONFIG,
-			"No config file exists for the given level '%i'", level);
+			"No config file exists for the given level '%i'", (int)level);
 		return GIT_ENOTFOUND;
 	}
 
@@ -175,17 +175,17 @@ static int duplicate_level(void **old_raw, void *new_raw)
 
 	GIT_UNUSED(new_raw);
 
-	giterr_set(GITERR_CONFIG, "A file with the same level (%i) has already been added to the config", (*old)->level);
+	giterr_set(GITERR_CONFIG, "A file with the same level (%i) has already been added to the config", (int)(*old)->level);
 	return GIT_EEXISTS;
 }
 
 static void try_remove_existing_file_internal(
 	git_config *cfg,
-	unsigned int level)
+	git_config_level_t level)
 {
 	int pos = -1;
 	file_internal *internal;
-	unsigned int i;
+	size_t i;
 
 	git_vector_foreach(&cfg->files, i, internal) {
 		if (internal->level == level)
@@ -206,7 +206,7 @@ static void try_remove_existing_file_internal(
 static int git_config__add_internal(
 	git_config *cfg,
 	file_internal *internal,
-	unsigned int level,
+	git_config_level_t level,
 	int force)
 {
 	int result;
@@ -238,7 +238,7 @@ int git_config_open_global(git_config **cfg_out, git_config *cfg)
 int git_config_open_level(
 	git_config **cfg_out,
 	const git_config *cfg_parent,
-	unsigned int level)
+	git_config_level_t level)
 {
 	git_config *cfg;
 	file_internal *internal;
@@ -263,7 +263,7 @@ int git_config_open_level(
 int git_config_add_backend(
 	git_config *cfg,
 	git_config_backend *file,
-	unsigned int level,
+	git_config_level_t level,
 	int force)
 {
 	file_internal *internal;

src/config_file.c

@@ -81,10 +81,10 @@ typedef struct {
 	time_t file_mtime;
 	size_t file_size;
 
-	unsigned int level;
+	git_config_level_t level;
 } diskfile_backend;
 
-static int config_parse(diskfile_backend *cfg_file, unsigned int level);
+static int config_parse(diskfile_backend *cfg_file, git_config_level_t level);
 static int parse_variable(diskfile_backend *cfg, char **var_name, char **var_value);
 static int config_write(diskfile_backend *cfg, const char *key, const regex_t *preg, const char *value);
 static char *escape_value(const char *ptr);
@@ -181,7 +181,7 @@ static void free_vars(git_strmap *values)
 	git_strmap_free(values);
 }
 
-static int config_open(git_config_backend *cfg, unsigned int level)
+static int config_open(git_config_backend *cfg, git_config_level_t level)
 {
 	int res;
 	diskfile_backend *b = (diskfile_backend *)cfg;
@@ -965,7 +965,7 @@ static int strip_comments(char *line, int in_quotes)
 	return quote_count;
 }
 
-static int config_parse(diskfile_backend *cfg_file, unsigned int level)
+static int config_parse(diskfile_backend *cfg_file, git_config_level_t level)
 {
 	int c;
 	char *current_section = NULL;