[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 "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
#define IPATTERN(name, pattern, word_regex)			\
	{ name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
	  word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
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].*)$",
	 /* -- */
	 "[a-zA-Z][a-zA-Z0-9_]*"
	 "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
	 /* numbers and format statements like 2E14.4, or ES12.6, 9X.
	  * Don't worry about format statements without leading digits since
	  * they would have been matched above as a variable anyway. */
	 "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
	 "|//|\\*\\*|::|[/<>=]="),
PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
	 "[^<>= \t]+"),
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]*\\([^;]*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]="
	 "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
PATTERNS("objc",
	 /* Negate C statements that can look like functions */
	 "!^[ \t]*(do|for|if|else|return|switch|while)\n"
	 /* Objective-C methods */
	 "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\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]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
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]+"
	 "|<>|<=|>=|:=|\\.\\."),
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>]|~~|::"
	 "|&&=|\\|\\|=|//=|\\*\\*="
	 "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
	 "|[-+*/%.^&<>=!|]="
	 "|=~|!~"
	 "|<<|<>|<=>|>>"),
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]+"
	 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
	 /* -- */
PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
	 /* -- */
	 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
	 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
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]+"),
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)[^;]*)$",
	 /* -- */
	 "[a-zA-Z_][a-zA-Z0-9_]*"
	 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
PATTERNS("csharp",
	 /* Keywords */
	 "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
	 /* Methods and constructors */
	 "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\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]?"
	 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
{ "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	10	#define PATTERNS(name, pattern, word_regex) \
664d44ee JN	11	{ name, NULL, -1, { pattern, REG_EXTENDED }, \
664d44ee JN	12	word_regex "\|[^[:space:]]\|[\xc0-\xff][\x80-\xbf]+" }
909a5494	13	#define IPATTERN(name, pattern, word_regex) \
664d44ee JN	14	{ name, NULL, -1, { pattern, REG_EXTENDED \| REG_ICASE }, \
664d44ee JN	15	word_regex "\|[^[:space:]]\|[\xc0-\xff][\x80-\xbf]+" }
be58e70d	16	static struct userdiff_driver builtin_drivers[] = {
909a5494 BC	17	IPATTERN("fortran",
	18	"!^([C]\|[ \t]!)\n"
	19	"!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
	20	"^[ \t]*((END[ \t]+)?(PROGRAM\|MODULE\|BLOCK[ \t]+DATA"
	21	"\|([^'\" \t]+[ \t]+)(SUBROUTINE\|FUNCTION))[ \t]+[A-Z].)$",
	22	/* -- */
	23	"[a-zA-Z][a-zA-Z0-9_]*"
	24	"\|\\.([Ee][Qq]\|[Nn][Ee]\|[Gg][TtEe]\|[Ll][TtEe]\|[Tt][Rr][Uu][Ee]\|[Ff][Aa][Ll][Ss][Ee]\|[Aa][Nn][Dd]\|[Oo][Rr]\|[Nn]?[Ee][Qq][Vv]\|[Nn][Oo][Tt])\\."
	25	/* numbers and format statements like 2E14.4, or ES12.6, 9X.
	26	* Don't worry about format statements without leading digits since
	27	* they would have been matched above as a variable anyway. */
	28	"\|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.])?(_[a-zA-Z0-9][a-zA-Z0-9_])?"
664d44ee	29	"\|//\|\\\\\|::\|[/<>=]="),
80c49c3d	30	PATTERNS("html", "^[ \t](<[Hh][1-6][ \t].>.*)$",
664d44ee	31	"[^<>= \t]+"),
80c49c3d	32	PATTERNS("java",
be58e70d	33	"!^[ \t]*(catch\|do\|for\|if\|instanceof\|new\|return\|switch\|throw\|while)\n"
959e2e64 PB	34	"^[ \t](([A-Za-z_][A-Za-z_0-9][ \t]+)+[A-Za-z_][A-Za-z_0-9][ \t]\\([^;]*)$",
959e2e64 PB	35	/* -- */
80c49c3d TR	36	"[a-zA-Z_][a-zA-Z0-9_]*"
	37	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
	38	"\|[-+*/<>%&^\|=!]="
664d44ee	39	"\|--\|\\+\\+\|<<=?\|>>>?=?\|&&\|\\\|\\\|"),
80c49c3d	40	PATTERNS("objc",
be58e70d JK	41	/* Negate C statements that can look like functions */
	42	"!^[ \t]*(do\|for\|if\|else\|return\|switch\|while)\n"
	43	/* Objective-C methods */
	44	"^[ \t]([-+][ \t]\\([ \t][A-Za-z_][A-Za-z_0-9 \t]\\)[ \t][A-Za-z_].*)$\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]?"
664d44ee	52	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"),
80c49c3d	53	PATTERNS("pascal",
ad5b6942	54	"^(((class[ \t]+)?(procedure\|function)\|constructor\|destructor\|interface\|"
be58e70d JK	55	"implementation\|initialization\|finalization)[ \t].)$"
be58e70d JK	56	"\n"
80c49c3d TR	57	"^(.=[ \t](class\|record).*)$",
	58	/* -- */
	59	"[a-zA-Z_][a-zA-Z0-9_]*"
	60	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+"
664d44ee	61	"\|<>\|<=\|>=\|:=\|\\.\\."),
71a5d4bc JN	62	PATTERNS("perl",
71a5d4bc JN	63	"^[ \t]package .;\n"
a25e4737 JH	64	"^[ \t]sub . \\{\n"
	65	"^[A-Z]+ \\{\n" /* BEGIN, END, ... */
	66	"^=head[0-9] ", /* POD */
71a5d4bc JN	67	/* -- */
	68	"[[:alpha:]_'][[:alnum:]_']*"
	69	"\|0[xb]?[0-9a-fA-F_]*"
	70	/* taking care not to interpret 3..5 as (3.)(.5) */
	71	"\|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
	72	"\|=>\|-[rwxoRWXOezsfdlpSugkbctTBMAC>]\|~~\|::"
	73	"\|&&=\|\\\|\\\|=\|//=\|\\\\="
	74	"\|&&\|\\\|\\\|\|//\|\\+\\+\|--\|\\\\\|\\.\\.\\.?"
	75	"\|[-+*/%.^&<>=!\|]="
	76	"\|=~\|!~"
664d44ee	77	"\|<<\|<>\|<=>\|>>"),
6d2f208c BS	78	PATTERNS("php",
	79	"^[\t ](((public\|protected\|private\|static)[\t ]+)function.*)$\n"
	80	"^[\t ](class.)$",
80c49c3d TR	81	/* -- */
	82	"[a-zA-Z_][a-zA-Z0-9_]*"
	83	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+"
664d44ee	84	"\|[-+*/<>%&^\|=!.]=\|--\|\\+\\+\|<<=?\|>>=?\|===\|&&\|\\\|\\\|\|::\|->"),
80c49c3d TR	85	PATTERNS("python", "^[ \t]((class\|def)[ \t].)$",
	86	/* -- */
	87	"[a-zA-Z_][a-zA-Z0-9_]*"
	88	"\|[-+0-9.e]+[jJlL]?\|0[xX]?[0-9a-fA-F]+[lL]?"
664d44ee	89	"\|[-+/<>%&^\|=!]=\|//=?\|<<=?\|>>=?\|\\\\*=?"),
80c49c3d TR	90	/* -- */
	91	PATTERNS("ruby", "^[ \t]((class\|module\|def)[ \t].)$",
	92	/* -- */
	93	"(@\|@@\|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
	94	"\|[-+0-9.e]+\|0[xXbB]?[0-9a-fA-F]+\|\\?(\\\\C-)?(\\\\M-)?."
664d44ee	95	"\|//=?\|[-+*/<>%&^\|=!]=\|<<=?\|>>=?\|===\|\\.{1,3}\|::\|[!=]~"),
80c49c3d TR	96	PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]\\{{0,1}[ \t][^ \t\"@',\\#}{~%]).$",
	97	"[={}\"]\|[^={}\" \t]+"),
	98	PATTERNS("tex", "^(\\\\((sub)section\|chapter\|part)\\{0,1}\\{.*)$",
664d44ee	99	"\\\\[a-zA-Z@]+\|\\\\.\|[a-zA-Z0-9\x80-\xff]+"),
80c49c3d TR	100	PATTERNS("cpp",
	101	/* Jump targets or access declarations */
	102	"!^[ \t][A-Za-z_][A-Za-z_0-9]:.*$\n"
	103	/* C/++ functions/methods at top level */
	104	"^([A-Za-z_][A-Za-z_0-9]([ \t]+[A-Za-z_][A-Za-z_0-9]([ \t]::[ \t][^[:space:]]+)?){1,}[ \t]\\([^;])$\n"
	105	/* compound type at top level */
	106	"^((struct\|class\|enum)[^;]*)$",
	107	/* -- */
	108	"[a-zA-Z_][a-zA-Z0-9_]*"
	109	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
664d44ee	110	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"),
b221207d PO	111	PATTERNS("csharp",
	112	/* Keywords */
	113	"!^[ \t]*(do\|while\|for\|if\|else\|instanceof\|new\|return\|switch\|case\|throw\|catch\|using)\n"
	114	/* Methods and constructors */
	115	"^[ \t](((static\|public\|internal\|private\|protected\|new\|virtual\|sealed\|override\|unsafe)[ \t]+)[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]\\(.\\))[ \t]*$\n"
	116	/* Properties */
	117	"^[ \t](((static\|public\|internal\|private\|protected\|new\|virtual\|sealed\|override\|unsafe)[ \t]+)[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
	118	/* Type definitions */
	119	"^[ \t](((static\|public\|internal\|private\|protected\|new\|unsafe\|sealed\|abstract\|partial)[ \t]+)(class\|enum\|interface\|struct)[ \t]+.*)$\n"
	120	/* Namespace */
	121	"^[ \t](namespace[ \t]+.)$",
	122	/* -- */
	123	"[a-zA-Z_][a-zA-Z0-9_]*"
	124	"\|[-+0-9.e]+[fFlL]?\|0[xXbB]?[0-9a-fA-F]+[lL]?"
664d44ee	125	"\|[-+*/<>%&^\|=!]=\|--\|\\+\\+\|<<=?\|>>=?\|&&\|\\\|\\\|\|::\|->"),
122aa6f9	126	{ "default", NULL, -1, { NULL, 0 } },
be58e70d	127	};
80c49c3d	128	#undef PATTERNS
909a5494	129	#undef IPATTERN
be58e70d JK	130
	131	static struct userdiff_driver driver_true = {
	132	"diff=true",
	133	NULL,
122aa6f9	134	0,
be58e70d JK	135	{ NULL, 0 }
be58e70d JK	136	};
be58e70d JK	137
	138	static struct userdiff_driver driver_false = {
	139	"!diff",
	140	NULL,
122aa6f9	141	1,
be58e70d JK	142	{ NULL, 0 }
be58e70d JK	143	};
be58e70d JK	144
	145	static struct userdiff_driver userdiff_find_by_namelen(const char k, int len)
	146	{
	147	int i;
	148	for (i = 0; i < ndrivers; i++) {
	149	struct userdiff_driver *drv = drivers + i;
	150	if (!strncmp(drv->name, k, len) && !drv->name[len])
	151	return drv;
	152	}
	153	for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
	154	struct userdiff_driver *drv = builtin_drivers + i;
	155	if (!strncmp(drv->name, k, len) && !drv->name[len])
	156	return drv;
	157	}
	158	return NULL;
	159	}
	160
	161	static struct userdiff_driver parse_driver(const char var,
	162	const char value, const char type)
	163	{
	164	struct userdiff_driver *drv;
	165	const char *dot;
	166	const char *name;
	167	int namelen;
	168
	169	if (prefixcmp(var, "diff."))
	170	return NULL;
	171	dot = strrchr(var, '.');
	172	if (dot == var + 4)
	173	return NULL;
	174	if (strcmp(type, dot+1))
	175	return NULL;
	176
	177	name = var + 5;
	178	namelen = dot - name;
	179	drv = userdiff_find_by_namelen(name, namelen);
	180	if (!drv) {
	181	ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
	182	drv = &drivers[ndrivers++];
	183	memset(drv, 0, sizeof(*drv));
	184	drv->name = xmemdupz(name, namelen);
122aa6f9	185	drv->binary = -1;
be58e70d JK	186	}
	187	return drv;
	188	}
	189
	190	static int parse_funcname(struct userdiff_funcname f, const char k,
	191	const char *v, int cflags)
	192	{
	193	if (git_config_string(&f->pattern, k, v) < 0)
	194	return -1;
	195	f->cflags = cflags;
	196	return 1;
	197	}
	198
	199	static int parse_string(const char *d, const char k, const char *v)
	200	{
	201	if (git_config_string(d, k, v) < 0)
	202	return -1;
	203	return 1;
	204	}
	205
122aa6f9 JK	206	static int parse_tristate(int b, const char k, const char *v)
	207	{
	208	if (v && !strcasecmp(v, "auto"))
	209	*b = -1;
	210	else
	211	*b = git_config_bool(k, v);
	212	return 1;
	213	}
	214
d9bae1a1 JK	215	static int parse_bool(int b, const char k, const char *v)
	216	{
	217	*b = git_config_bool(k, v);
	218	return 1;
	219	}
	220
c7534ef4	221	int userdiff_config(const char k, const char v)
be58e70d JK	222	{
	223	struct userdiff_driver *drv;
	224
	225	if ((drv = parse_driver(k, v, "funcname")))
	226	return parse_funcname(&drv->funcname, k, v, 0);
	227	if ((drv = parse_driver(k, v, "xfuncname")))
	228	return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
122aa6f9 JK	229	if ((drv = parse_driver(k, v, "binary")))
122aa6f9 JK	230	return parse_tristate(&drv->binary, k, v);
be58e70d JK	231	if ((drv = parse_driver(k, v, "command")))
be58e70d JK	232	return parse_string(&drv->external, k, v);
9cb92c39 JK	233	if ((drv = parse_driver(k, v, "textconv")))
9cb92c39 JK	234	return parse_string(&drv->textconv, k, v);
d9bae1a1 JK	235	if ((drv = parse_driver(k, v, "cachetextconv")))
d9bae1a1 JK	236	return parse_bool(&drv->textconv_want_cache, k, v);
80c49c3d TR	237	if ((drv = parse_driver(k, v, "wordregex")))
80c49c3d TR	238	return parse_string(&drv->word_regex, k, v);
be58e70d JK	239
	240	return 0;
	241	}
	242
	243	struct userdiff_driver userdiff_find_by_name(const char name) {
	244	int len = strlen(name);
	245	return userdiff_find_by_namelen(name, len);
	246	}
	247
	248	struct userdiff_driver userdiff_find_by_path(const char path)
	249	{
	250	static struct git_attr *attr;
	251	struct git_attr_check check;
	252
	253	if (!attr)
7fb0eaa2	254	attr = git_attr("diff");
be58e70d JK	255	check.attr = attr;
	256
	257	if (!path)
	258	return NULL;
	259	if (git_checkattr(path, 1, &check))
	260	return NULL;
	261
	262	if (ATTR_TRUE(check.value))
	263	return &driver_true;
	264	if (ATTR_FALSE(check.value))
	265	return &driver_false;
	266	if (ATTR_UNSET(check.value))
	267	return NULL;
	268	return userdiff_find_by_name(check.value);
	269	}