rerere forget path: forget recorded resolution
[git/git.git] / userdiff.c
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1#include "userdiff.h"
2#include "cache.h"
3#include "attr.h"
4
5static struct userdiff_driver *drivers;
6static int ndrivers;
7static int drivers_alloc;
8
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9#define PATTERNS(name, pattern, word_regex) \
10 { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
be58e70d 11static struct userdiff_driver builtin_drivers[] = {
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12PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
13 "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
14PATTERNS("java",
be58e70d 15 "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
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16 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
17 /* -- */
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18 "[a-zA-Z_][a-zA-Z0-9_]*"
19 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
20 "|[-+*/<>%&^|=!]="
21 "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
22 "|[^[:space:]]|[\x80-\xff]+"),
23PATTERNS("objc",
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24 /* Negate C statements that can look like functions */
25 "!^[ \t]*(do|for|if|else|return|switch|while)\n"
26 /* Objective-C methods */
27 "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
28 /* C functions */
959e2e64 29 "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
be58e70d 30 /* Objective-C class/protocol definitions */
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31 "^(@(implementation|interface|protocol)[ \t].*)$",
32 /* -- */
33 "[a-zA-Z_][a-zA-Z0-9_]*"
34 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
35 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
36 "|[^[:space:]]|[\x80-\xff]+"),
37PATTERNS("pascal",
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38 "^((procedure|function|constructor|destructor|interface|"
39 "implementation|initialization|finalization)[ \t]*.*)$"
40 "\n"
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41 "^(.*=[ \t]*(class|record).*)$",
42 /* -- */
43 "[a-zA-Z_][a-zA-Z0-9_]*"
44 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
45 "|<>|<=|>=|:=|\\.\\."
46 "|[^[:space:]]|[\x80-\xff]+"),
47PATTERNS("php", "^[\t ]*((function|class).*)",
48 /* -- */
49 "[a-zA-Z_][a-zA-Z0-9_]*"
50 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
51 "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
52 "|[^[:space:]]|[\x80-\xff]+"),
53PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
54 /* -- */
55 "[a-zA-Z_][a-zA-Z0-9_]*"
56 "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
57 "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
58 "|[^[:space:]|[\x80-\xff]+"),
59 /* -- */
60PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
61 /* -- */
62 "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
63 "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
64 "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
65 "|[^[:space:]|[\x80-\xff]+"),
66PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
67 "[={}\"]|[^={}\" \t]+"),
68PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
69 "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
70PATTERNS("cpp",
71 /* Jump targets or access declarations */
72 "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
73 /* C/++ functions/methods at top level */
74 "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
75 /* compound type at top level */
76 "^((struct|class|enum)[^;]*)$",
77 /* -- */
78 "[a-zA-Z_][a-zA-Z0-9_]*"
79 "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
80 "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
81 "|[^[:space:]]|[\x80-\xff]+"),
122aa6f9 82{ "default", NULL, -1, { NULL, 0 } },
be58e70d 83};
80c49c3d 84#undef PATTERNS
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85
86static struct userdiff_driver driver_true = {
87 "diff=true",
88 NULL,
122aa6f9 89 0,
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90 { NULL, 0 }
91};
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92
93static struct userdiff_driver driver_false = {
94 "!diff",
95 NULL,
122aa6f9 96 1,
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97 { NULL, 0 }
98};
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99
100static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
101{
102 int i;
103 for (i = 0; i < ndrivers; i++) {
104 struct userdiff_driver *drv = drivers + i;
105 if (!strncmp(drv->name, k, len) && !drv->name[len])
106 return drv;
107 }
108 for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
109 struct userdiff_driver *drv = builtin_drivers + i;
110 if (!strncmp(drv->name, k, len) && !drv->name[len])
111 return drv;
112 }
113 return NULL;
114}
115
116static struct userdiff_driver *parse_driver(const char *var,
117 const char *value, const char *type)
118{
119 struct userdiff_driver *drv;
120 const char *dot;
121 const char *name;
122 int namelen;
123
124 if (prefixcmp(var, "diff."))
125 return NULL;
126 dot = strrchr(var, '.');
127 if (dot == var + 4)
128 return NULL;
129 if (strcmp(type, dot+1))
130 return NULL;
131
132 name = var + 5;
133 namelen = dot - name;
134 drv = userdiff_find_by_namelen(name, namelen);
135 if (!drv) {
136 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
137 drv = &drivers[ndrivers++];
138 memset(drv, 0, sizeof(*drv));
139 drv->name = xmemdupz(name, namelen);
122aa6f9 140 drv->binary = -1;
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141 }
142 return drv;
143}
144
145static int parse_funcname(struct userdiff_funcname *f, const char *k,
146 const char *v, int cflags)
147{
148 if (git_config_string(&f->pattern, k, v) < 0)
149 return -1;
150 f->cflags = cflags;
151 return 1;
152}
153
154static int parse_string(const char **d, const char *k, const char *v)
155{
156 if (git_config_string(d, k, v) < 0)
157 return -1;
158 return 1;
159}
160
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161static int parse_tristate(int *b, const char *k, const char *v)
162{
163 if (v && !strcasecmp(v, "auto"))
164 *b = -1;
165 else
166 *b = git_config_bool(k, v);
167 return 1;
168}
169
c7534ef4 170int userdiff_config(const char *k, const char *v)
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171{
172 struct userdiff_driver *drv;
173
174 if ((drv = parse_driver(k, v, "funcname")))
175 return parse_funcname(&drv->funcname, k, v, 0);
176 if ((drv = parse_driver(k, v, "xfuncname")))
177 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
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178 if ((drv = parse_driver(k, v, "binary")))
179 return parse_tristate(&drv->binary, k, v);
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180 if ((drv = parse_driver(k, v, "command")))
181 return parse_string(&drv->external, k, v);
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182 if ((drv = parse_driver(k, v, "textconv")))
183 return parse_string(&drv->textconv, k, v);
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184 if ((drv = parse_driver(k, v, "wordregex")))
185 return parse_string(&drv->word_regex, k, v);
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186
187 return 0;
188}
189
190struct userdiff_driver *userdiff_find_by_name(const char *name) {
191 int len = strlen(name);
192 return userdiff_find_by_namelen(name, len);
193}
194
195struct userdiff_driver *userdiff_find_by_path(const char *path)
196{
197 static struct git_attr *attr;
198 struct git_attr_check check;
199
200 if (!attr)
201 attr = git_attr("diff", 4);
202 check.attr = attr;
203
204 if (!path)
205 return NULL;
206 if (git_checkattr(path, 1, &check))
207 return NULL;
208
209 if (ATTR_TRUE(check.value))
210 return &driver_true;
211 if (ATTR_FALSE(check.value))
212 return &driver_false;
213 if (ATTR_UNSET(check.value))
214 return NULL;
215 return userdiff_find_by_name(check.value);
216}