[thirdparty/git.git] / userdiff.c

#include "cache.h"
#include "userdiff.h"
#include "cache.h"
#include "attr.h"

static struct userdiff_driver *drivers;
static int ndrivers;
static int drivers_alloc;

#define PATTERNS(name, pattern, word_regex)			\
	{ name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
#define IPATTERN(name, pattern, word_regex)			\
	{ name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, word_regex }
static struct userdiff_driver builtin_drivers[] = {
IPATTERN("fortran",
	 "!^([C*]|[ \t]*!)\n"
	 "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
	 "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
		"|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
	 /* -- */
	 "[a-zA-Z][a-zA-Z0-9_]*"
	 "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
	 /* numbers and format statements like 2E14.4, or ES12.6, 9X.
	  * Don't worry about format statements without leading digits since
	  * they would have been matched above as a variable anyway. */
	 "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
	 "|//|\\*\\*|::|[/<>=]="
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
	 "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("java",
	 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
	 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]="
	 "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("objc",
	 /* Negate C statements that can look like functions */
	 "!^[ \t]*(do|for|if|else|return|switch|while)\n"
	 /* Objective-C methods */
	 "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
	 /* C functions */
	 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
	 /* Objective-C class/protocol definitions */
	 "^(@(implementation|interface|protocol)[ \t].*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("pascal",
	 "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
		"implementation|initialization|finalization)[ \t]*.*)$"
	 "\n"
	 "^(.*=[ \t]*(class|record).*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
	 "|<>|<=|>=|:=|\\.\\."
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("perl",
	 "^[ \t]*package .*;\n"
	 "^[ \t]*sub .* \\{\n"
	 "^[A-Z]+ \\{\n"	/* BEGIN, END, ... */
	 "^=head[0-9] ",	/* POD */
	 /* -- */
	 "[[:alpha:]_'][[:alnum:]_']*"
	 "|0[xb]?[0-9a-fA-F_]*"
	 /* taking care not to interpret 3..5 as (3.)(.5) */
	 "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
	 "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
	 "|&&=|\\|\\|=|//=|\\*\\*="
	 "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
	 "|[-+*/%.^&<>=!|]="
	 "|=~|!~"
	 "|<<|<>|<=>|>>"
	 "|[^[:space:]]"),
PATTERNS("php",
	 "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
	 "^[\t ]*(class.*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
	 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
	 "|[^[:space:]]|[\x80-\xff]+"),
	 /* -- */
PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
	 /* -- */
	 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
	 "[={}\"]|[^={}\" \t]+"),
PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
	 "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
PATTERNS("cpp",
	 /* Jump targets or access declarations */
	 "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
	 /* C/++ functions/methods at top level */
	 "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
	 /* compound type at top level */
	 "^((struct|class|enum)[^;]*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
	 "|[^[:space:]]|[\x80-\xff]+"),
PATTERNS("csharp",
	 /* Keywords */
	 "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
	 /* Methods and constructors */
	 "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
	 /* Properties */
	 "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
	 /* Type definitions */
	 "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
	 /* Namespace */
	 "^[ \t]*(namespace[ \t]+.*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
	 "|[^[:space:]]|[\x80-\xff]+"),
{ "default", NULL, -1, { NULL, 0 } },
};
#undef PATTERNS
#undef IPATTERN

static struct userdiff_driver driver_true = {
	"diff=true",
	NULL,
	0,
	{ NULL, 0 }
};

static struct userdiff_driver driver_false = {
	"!diff",
	NULL,
	1,
	{ NULL, 0 }
};

static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
{
	int i;
	for (i = 0; i < ndrivers; i++) {
		struct userdiff_driver *drv = drivers + i;
		if (!strncmp(drv->name, k, len) && !drv->name[len])
			return drv;
	}
	for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
		struct userdiff_driver *drv = builtin_drivers + i;
		if (!strncmp(drv->name, k, len) && !drv->name[len])
			return drv;
	}
	return NULL;
}

static struct userdiff_driver *parse_driver(const char *var,
		const char *value, const char *type)
{
	struct userdiff_driver *drv;
	const char *dot;
	const char *name;
	int namelen;

	if (prefixcmp(var, "diff."))
		return NULL;
	dot = strrchr(var, '.');
	if (dot == var + 4)
		return NULL;
	if (strcmp(type, dot+1))
		return NULL;

	name = var + 5;
	namelen = dot - name;
	drv = userdiff_find_by_namelen(name, namelen);
	if (!drv) {
		ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
		drv = &drivers[ndrivers++];
		memset(drv, 0, sizeof(*drv));
		drv->name = xmemdupz(name, namelen);
		drv->binary = -1;
	}
	return drv;
}

static int parse_funcname(struct userdiff_funcname *f, const char *k,
		const char *v, int cflags)
{
	if (git_config_string(&f->pattern, k, v) < 0)
		return -1;
	f->cflags = cflags;
	return 1;
}

static int parse_string(const char **d, const char *k, const char *v)
{
	if (git_config_string(d, k, v) < 0)
		return -1;
	return 1;
}

static int parse_tristate(int *b, const char *k, const char *v)
{
	if (v && !strcasecmp(v, "auto"))
		*b = -1;
	else
		*b = git_config_bool(k, v);
	return 1;
}

static int parse_bool(int *b, const char *k, const char *v)
{
	*b = git_config_bool(k, v);
	return 1;
}

int userdiff_config(const char *k, const char *v)
{
	struct userdiff_driver *drv;

	if ((drv = parse_driver(k, v, "funcname")))
		return parse_funcname(&drv->funcname, k, v, 0);
	if ((drv = parse_driver(k, v, "xfuncname")))
		return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
	if ((drv = parse_driver(k, v, "binary")))
		return parse_tristate(&drv->binary, k, v);
	if ((drv = parse_driver(k, v, "command")))
		return parse_string(&drv->external, k, v);
	if ((drv = parse_driver(k, v, "textconv")))
		return parse_string(&drv->textconv, k, v);
	if ((drv = parse_driver(k, v, "cachetextconv")))
		return parse_bool(&drv->textconv_want_cache, k, v);
	if ((drv = parse_driver(k, v, "wordregex")))
		return parse_string(&drv->word_regex, k, v);

	return 0;
}

struct userdiff_driver *userdiff_find_by_name(const char *name) {
	int len = strlen(name);
	return userdiff_find_by_namelen(name, len);
}

struct userdiff_driver *userdiff_find_by_path(const char *path)
{
	static struct git_attr *attr;
	struct git_attr_check check;

	if (!attr)
		attr = git_attr("diff");
	check.attr = attr;

	if (!path)
		return NULL;
	if (git_checkattr(path, 1, &check))
		return NULL;

	if (ATTR_TRUE(check.value))
		return &driver_true;
	if (ATTR_FALSE(check.value))
		return &driver_false;
	if (ATTR_UNSET(check.value))
		return NULL;
	return userdiff_find_by_name(check.value);
}
Commit	Line	Data
d9bae1a1	1	#include "cache.h"
be58e70d JK	2	#include "userdiff.h"
	3	#include "cache.h"
	4	#include "attr.h"
	5
	6	static struct userdiff_driver *drivers;
	7	static int ndrivers;
	8	static int drivers_alloc;
	9
ae3b970a BSSJ	10	#define PATTERNS(name, pattern, word_regex) \
ae3b970a BSSJ	11	{ name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
909a5494 BC	12	#define IPATTERN(name, pattern, word_regex) \
909a5494 BC	13	{ name, NULL, -1, { pattern, REG_EXTENDED \| REG_ICASE }, word_regex }
be58e70d	14	static struct userdiff_driver builtin_drivers[] = {
909a5494 BC	15	IPATTERN("fortran",
	16	"!^([C]\|[ \t]!)\n"
	17	"!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
	18	"^[ \t]*((END[ \t]+)?(PROGRAM\|MODULE\|BLOCK[ \t]+DATA"
	19	"\|([^'\" \t]+[ \t]+)(SUBROUTINE\|FUNCTION))[ \t]+[A-Z].)$",
	20	/* -- */
	21	"[a-zA-Z][a-zA-Z0-9_]*"
	22	"\|\\.([Ee][Qq]\|[Nn][Ee]\|[Gg][TtEe]\|[Ll][TtEe]\|[Tt][Rr][Uu][Ee]\|[Ff][Aa][Ll][Ss][Ee]\|[Aa][Nn][Dd]\|[Oo][Rr]\|[Nn]?[Ee][Qq][Vv]\|[Nn][Oo][Tt])\\."
	23	/* numbers and format statements like 2E14.4, or ES12.6, 9X.
	24	* Don't worry about format statements without leading digits since
	25	* they would have been matched above as a variable anyway. */
	26	"\|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.])?(_[a-zA-Z0-9][a-zA-Z0-9_])?"
	27	"\|//\|\\\\\|::\|[/<>=]="
	28	"\|[^[:space:]]\|[\x80-\xff]+"),
80c49c3d TR	29	PATTERNS("html", "^[ \t](<[Hh][1-6][ \t].>.*)$",
	30	"[^<>= \t]+\|[^[:space:]]\|[\x80-\xff]+"),
	31	PATTERNS("java",
be58e70d	32	"!^[ \t]*(catch\|do\|for\|if\|instanceof\|new\|return\|switch\|throw\|while)\n"
959e2e64 PB	33	"^[ \t](([A-Za-z_][A-Za-z_0-9][ \t]+)+[A-Za-z_][A-Za-z_0-9][ \t]\\([^;]*)$",
959e2e64 PB	34	/* -- */
80c49c3d TR	35	"[a-zA-Z_][a-zA-Z0-9_]*"
	36	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
	37	"\|[-+*/<>%&^\|=!]="
	38	"\|--\|\\+\\+\|<<=?\|>>>?=?\|&&\|\\\|\\\|"
	39	"\|[^[:space:]]\|[\x80-\xff]+"),
	40	PATTERNS("objc",
be58e70d JK	41	/* Negate C statements that can look like functions */
	42	"!^[ \t]*(do\|for\|if\|else\|return\|switch\|while)\n"
	43	/* Objective-C methods */
	44	"^[ \t]([-+][ \t]\\([ \t][A-Za-z_][A-Za-z_0-9 \t]\\)[ \t][A-Za-z_].*)$\n"
	45	/* C functions */
959e2e64	46	"^[ \t](([A-Za-z_][A-Za-z_0-9][ \t]+)+[A-Za-z_][A-Za-z_0-9][ \t]\\([^;]*)$\n"
be58e70d	47	/* Objective-C class/protocol definitions */
80c49c3d TR	48	"^(@(implementation\|interface\|protocol)[ \t].*)$",
	49	/* -- */
	50	"[a-zA-Z_][a-zA-Z0-9_]*"
	51	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
	52	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"
	53	"\|[^[:space:]]\|[\x80-\xff]+"),
	54	PATTERNS("pascal",
ad5b6942	55	"^(((class[ \t]+)?(procedure\|function)\|constructor\|destructor\|interface\|"
be58e70d JK	56	"implementation\|initialization\|finalization)[ \t].)$"
be58e70d JK	57	"\n"
80c49c3d TR	58	"^(.=[ \t](class\|record).*)$",
	59	/* -- */
	60	"[a-zA-Z_][a-zA-Z0-9_]*"
	61	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+"
	62	"\|<>\|<=\|>=\|:=\|\\.\\."
	63	"\|[^[:space:]]\|[\x80-\xff]+"),
71a5d4bc JN	64	PATTERNS("perl",
71a5d4bc JN	65	"^[ \t]package .;\n"
a25e4737 JH	66	"^[ \t]sub . \\{\n"
	67	"^[A-Z]+ \\{\n" /* BEGIN, END, ... */
	68	"^=head[0-9] ", /* POD */
71a5d4bc JN	69	/* -- */
	70	"[[:alpha:]_'][[:alnum:]_']*"
	71	"\|0[xb]?[0-9a-fA-F_]*"
	72	/* taking care not to interpret 3..5 as (3.)(.5) */
	73	"\|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
	74	"\|=>\|-[rwxoRWXOezsfdlpSugkbctTBMAC>]\|~~\|::"
	75	"\|&&=\|\\\|\\\|=\|//=\|\\\\="
	76	"\|&&\|\\\|\\\|\|//\|\\+\\+\|--\|\\\\\|\\.\\.\\.?"
	77	"\|[-+*/%.^&<>=!\|]="
	78	"\|=~\|!~"
	79	"\|<<\|<>\|<=>\|>>"
	80	"\|[^[:space:]]"),
6d2f208c BS	81	PATTERNS("php",
	82	"^[\t ](((public\|protected\|private\|static)[\t ]+)function.*)$\n"
	83	"^[\t ](class.)$",
80c49c3d TR	84	/* -- */
	85	"[a-zA-Z_][a-zA-Z0-9_]*"
	86	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+"
	87	"\|[-+*/<>%&^\|=!.]=\|--\|\\+\\+\|<<=?\|>>=?\|===\|&&\|\\\|\\\|\|::\|->"
	88	"\|[^[:space:]]\|[\x80-\xff]+"),
	89	PATTERNS("python", "^[ \t]((class\|def)[ \t].)$",
	90	/* -- */
	91	"[a-zA-Z_][a-zA-Z0-9_]*"
	92	"\|[-+0-9.e]+[jJlL]?\|0[xX]?[0-9a-fA-F]+[lL]?"
	93	"\|[-+/<>%&^\|=!]=\|//=?\|<<=?\|>>=?\|\\\\*=?"
b34f69f9	94	"\|[^[:space:]]\|[\x80-\xff]+"),
80c49c3d TR	95	/* -- */
	96	PATTERNS("ruby", "^[ \t]((class\|module\|def)[ \t].)$",
	97	/* -- */
	98	"(@\|@@\|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
	99	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+\|\\?(\\\\C-)?(\\\\M-)?."
	100	"\|//=?\|[-+*/<>%&^\|=!]=\|<<=?\|>>=?\|===\|\\.{1,3}\|::\|[!=]~"
b34f69f9	101	"\|[^[:space:]]\|[\x80-\xff]+"),
80c49c3d TR	102	PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]\\{{0,1}[ \t][^ \t\"@',\\#}{~%]).$",
	103	"[={}\"]\|[^={}\" \t]+"),
	104	PATTERNS("tex", "^(\\\\((sub)section\|chapter\|part)\\{0,1}\\{.*)$",
	105	"\\\\[a-zA-Z@]+\|\\\\.\|[a-zA-Z0-9\x80-\xff]+\|[^[:space:]]"),
	106	PATTERNS("cpp",
	107	/* Jump targets or access declarations */
	108	"!^[ \t][A-Za-z_][A-Za-z_0-9]:.*$\n"
	109	/* C/++ functions/methods at top level */
	110	"^([A-Za-z_][A-Za-z_0-9]([ \t]+[A-Za-z_][A-Za-z_0-9]([ \t]::[ \t][^[:space:]]+)?){1,}[ \t]\\([^;])$\n"
	111	/* compound type at top level */
	112	"^((struct\|class\|enum)[^;]*)$",
	113	/* -- */
	114	"[a-zA-Z_][a-zA-Z0-9_]*"
	115	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
	116	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"
	117	"\|[^[:space:]]\|[\x80-\xff]+"),
b221207d PO	118	PATTERNS("csharp",
	119	/* Keywords */
	120	"!^[ \t]*(do\|while\|for\|if\|else\|instanceof\|new\|return\|switch\|case\|throw\|catch\|using)\n"
	121	/* Methods and constructors */
	122	"^[ \t](((static\|public\|internal\|private\|protected\|new\|virtual\|sealed\|override\|unsafe)[ \t]+)[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]\\(.\\))[ \t]*$\n"
	123	/* Properties */
	124	"^[ \t](((static\|public\|internal\|private\|protected\|new\|virtual\|sealed\|override\|unsafe)[ \t]+)[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
	125	/* Type definitions */
	126	"^[ \t](((static\|public\|internal\|private\|protected\|new\|unsafe\|sealed\|abstract\|partial)[ \t]+)(class\|enum\|interface\|struct)[ \t]+.*)$\n"
	127	/* Namespace */
	128	"^[ \t](namespace[ \t]+.)$",
	129	/* -- */
	130	"[a-zA-Z_][a-zA-Z0-9_]*"
	131	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
	132	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"
	133	"\|[^[:space:]]\|[\x80-\xff]+"),
122aa6f9	134	{ "default", NULL, -1, { NULL, 0 } },
be58e70d	135	};
80c49c3d	136	#undef PATTERNS
909a5494	137	#undef IPATTERN
be58e70d JK	138
	139	static struct userdiff_driver driver_true = {
	140	"diff=true",
	141	NULL,
122aa6f9	142	0,
be58e70d JK	143	{ NULL, 0 }
be58e70d JK	144	};
be58e70d JK	145
	146	static struct userdiff_driver driver_false = {
	147	"!diff",
	148	NULL,
122aa6f9	149	1,
be58e70d JK	150	{ NULL, 0 }
be58e70d JK	151	};
be58e70d JK	152
	153	static struct userdiff_driver userdiff_find_by_namelen(const char k, int len)
	154	{
	155	int i;
	156	for (i = 0; i < ndrivers; i++) {
	157	struct userdiff_driver *drv = drivers + i;
	158	if (!strncmp(drv->name, k, len) && !drv->name[len])
	159	return drv;
	160	}
	161	for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
	162	struct userdiff_driver *drv = builtin_drivers + i;
	163	if (!strncmp(drv->name, k, len) && !drv->name[len])
	164	return drv;
	165	}
	166	return NULL;
	167	}
	168
	169	static struct userdiff_driver parse_driver(const char var,
	170	const char value, const char type)
	171	{
	172	struct userdiff_driver *drv;
	173	const char *dot;
	174	const char *name;
	175	int namelen;
	176
	177	if (prefixcmp(var, "diff."))
	178	return NULL;
	179	dot = strrchr(var, '.');
	180	if (dot == var + 4)
	181	return NULL;
	182	if (strcmp(type, dot+1))
	183	return NULL;
	184
	185	name = var + 5;
	186	namelen = dot - name;
	187	drv = userdiff_find_by_namelen(name, namelen);
	188	if (!drv) {
	189	ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
	190	drv = &drivers[ndrivers++];
	191	memset(drv, 0, sizeof(*drv));
	192	drv->name = xmemdupz(name, namelen);
122aa6f9	193	drv->binary = -1;
be58e70d JK	194	}
	195	return drv;
	196	}
	197
	198	static int parse_funcname(struct userdiff_funcname f, const char k,
	199	const char *v, int cflags)
	200	{
	201	if (git_config_string(&f->pattern, k, v) < 0)
	202	return -1;
	203	f->cflags = cflags;
	204	return 1;
	205	}
	206
	207	static int parse_string(const char *d, const char k, const char *v)
	208	{
	209	if (git_config_string(d, k, v) < 0)
	210	return -1;
	211	return 1;
	212	}
	213
122aa6f9 JK	214	static int parse_tristate(int b, const char k, const char *v)
	215	{
	216	if (v && !strcasecmp(v, "auto"))
	217	*b = -1;
	218	else
	219	*b = git_config_bool(k, v);
	220	return 1;
	221	}
	222
d9bae1a1 JK	223	static int parse_bool(int b, const char k, const char *v)
	224	{
	225	*b = git_config_bool(k, v);
	226	return 1;
	227	}
	228
c7534ef4	229	int userdiff_config(const char k, const char v)
be58e70d JK	230	{
	231	struct userdiff_driver *drv;
	232
	233	if ((drv = parse_driver(k, v, "funcname")))
	234	return parse_funcname(&drv->funcname, k, v, 0);
	235	if ((drv = parse_driver(k, v, "xfuncname")))
	236	return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
122aa6f9 JK	237	if ((drv = parse_driver(k, v, "binary")))
122aa6f9 JK	238	return parse_tristate(&drv->binary, k, v);
be58e70d JK	239	if ((drv = parse_driver(k, v, "command")))
be58e70d JK	240	return parse_string(&drv->external, k, v);
9cb92c39 JK	241	if ((drv = parse_driver(k, v, "textconv")))
9cb92c39 JK	242	return parse_string(&drv->textconv, k, v);
d9bae1a1 JK	243	if ((drv = parse_driver(k, v, "cachetextconv")))
d9bae1a1 JK	244	return parse_bool(&drv->textconv_want_cache, k, v);
80c49c3d TR	245	if ((drv = parse_driver(k, v, "wordregex")))
80c49c3d TR	246	return parse_string(&drv->word_regex, k, v);
be58e70d JK	247
	248	return 0;
	249	}
	250
	251	struct userdiff_driver userdiff_find_by_name(const char name) {
	252	int len = strlen(name);
	253	return userdiff_find_by_namelen(name, len);
	254	}
	255
	256	struct userdiff_driver userdiff_find_by_path(const char path)
	257	{
	258	static struct git_attr *attr;
	259	struct git_attr_check check;
	260
	261	if (!attr)
7fb0eaa2	262	attr = git_attr("diff");
be58e70d JK	263	check.attr = attr;
	264
	265	if (!path)
	266	return NULL;
	267	if (git_checkattr(path, 1, &check))
	268	return NULL;
	269
	270	if (ATTR_TRUE(check.value))
	271	return &driver_true;
	272	if (ATTR_FALSE(check.value))
	273	return &driver_false;
	274	if (ATTR_UNSET(check.value))
	275	return NULL;
	276	return userdiff_find_by_name(check.value);
	277	}