Merge branch 'jn/gitweb-plackup'
[git] / userdiff.c
1 #include "cache.h"
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
10 #define PATTERNS(name, pattern, word_regex)                     \
11         { name, NULL, -1, { pattern, REG_EXTENDED }, word_regex }
12 static struct userdiff_driver builtin_drivers[] = {
13 PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
14          "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
15 PATTERNS("java",
16          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
17          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
18          /* -- */
19          "[a-zA-Z_][a-zA-Z0-9_]*"
20          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
21          "|[-+*/<>%&^|=!]="
22          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
23          "|[^[:space:]]|[\x80-\xff]+"),
24 PATTERNS("objc",
25          /* Negate C statements that can look like functions */
26          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
27          /* Objective-C methods */
28          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
29          /* C functions */
30          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
31          /* Objective-C class/protocol definitions */
32          "^(@(implementation|interface|protocol)[ \t].*)$",
33          /* -- */
34          "[a-zA-Z_][a-zA-Z0-9_]*"
35          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
36          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
37          "|[^[:space:]]|[\x80-\xff]+"),
38 PATTERNS("pascal",
39          "^((procedure|function|constructor|destructor|interface|"
40                 "implementation|initialization|finalization)[ \t]*.*)$"
41          "\n"
42          "^(.*=[ \t]*(class|record).*)$",
43          /* -- */
44          "[a-zA-Z_][a-zA-Z0-9_]*"
45          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
46          "|<>|<=|>=|:=|\\.\\."
47          "|[^[:space:]]|[\x80-\xff]+"),
48 PATTERNS("php",
49          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
50          "^[\t ]*(class.*)$",
51          /* -- */
52          "[a-zA-Z_][a-zA-Z0-9_]*"
53          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
54          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"
55          "|[^[:space:]]|[\x80-\xff]+"),
56 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
57          /* -- */
58          "[a-zA-Z_][a-zA-Z0-9_]*"
59          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
60          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
61          "|[^[:space:]|[\x80-\xff]+"),
62          /* -- */
63 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
64          /* -- */
65          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
66          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
67          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
68          "|[^[:space:]|[\x80-\xff]+"),
69 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
70          "[={}\"]|[^={}\" \t]+"),
71 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
72          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
73 PATTERNS("cpp",
74          /* Jump targets or access declarations */
75          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
76          /* C/++ functions/methods at top level */
77          "^([A-Za-z_][A-Za-z_0-9]*([ \t]+[A-Za-z_][A-Za-z_0-9]*([ \t]*::[ \t]*[^[:space:]]+)?){1,}[ \t]*\\([^;]*)$\n"
78          /* compound type at top level */
79          "^((struct|class|enum)[^;]*)$",
80          /* -- */
81          "[a-zA-Z_][a-zA-Z0-9_]*"
82          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
83          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
84          "|[^[:space:]]|[\x80-\xff]+"),
85 { "default", NULL, -1, { NULL, 0 } },
86 };
87 #undef PATTERNS
88
89 static struct userdiff_driver driver_true = {
90         "diff=true",
91         NULL,
92         0,
93         { NULL, 0 }
94 };
95
96 static struct userdiff_driver driver_false = {
97         "!diff",
98         NULL,
99         1,
100         { NULL, 0 }
101 };
102
103 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
104 {
105         int i;
106         for (i = 0; i < ndrivers; i++) {
107                 struct userdiff_driver *drv = drivers + i;
108                 if (!strncmp(drv->name, k, len) && !drv->name[len])
109                         return drv;
110         }
111         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
112                 struct userdiff_driver *drv = builtin_drivers + i;
113                 if (!strncmp(drv->name, k, len) && !drv->name[len])
114                         return drv;
115         }
116         return NULL;
117 }
118
119 static struct userdiff_driver *parse_driver(const char *var,
120                 const char *value, const char *type)
121 {
122         struct userdiff_driver *drv;
123         const char *dot;
124         const char *name;
125         int namelen;
126
127         if (prefixcmp(var, "diff."))
128                 return NULL;
129         dot = strrchr(var, '.');
130         if (dot == var + 4)
131                 return NULL;
132         if (strcmp(type, dot+1))
133                 return NULL;
134
135         name = var + 5;
136         namelen = dot - name;
137         drv = userdiff_find_by_namelen(name, namelen);
138         if (!drv) {
139                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
140                 drv = &drivers[ndrivers++];
141                 memset(drv, 0, sizeof(*drv));
142                 drv->name = xmemdupz(name, namelen);
143                 drv->binary = -1;
144         }
145         return drv;
146 }
147
148 static int parse_funcname(struct userdiff_funcname *f, const char *k,
149                 const char *v, int cflags)
150 {
151         if (git_config_string(&f->pattern, k, v) < 0)
152                 return -1;
153         f->cflags = cflags;
154         return 1;
155 }
156
157 static int parse_string(const char **d, const char *k, const char *v)
158 {
159         if (git_config_string(d, k, v) < 0)
160                 return -1;
161         return 1;
162 }
163
164 static int parse_tristate(int *b, const char *k, const char *v)
165 {
166         if (v && !strcasecmp(v, "auto"))
167                 *b = -1;
168         else
169                 *b = git_config_bool(k, v);
170         return 1;
171 }
172
173 static int parse_bool(int *b, const char *k, const char *v)
174 {
175         *b = git_config_bool(k, v);
176         return 1;
177 }
178
179 int userdiff_config(const char *k, const char *v)
180 {
181         struct userdiff_driver *drv;
182
183         if ((drv = parse_driver(k, v, "funcname")))
184                 return parse_funcname(&drv->funcname, k, v, 0);
185         if ((drv = parse_driver(k, v, "xfuncname")))
186                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
187         if ((drv = parse_driver(k, v, "binary")))
188                 return parse_tristate(&drv->binary, k, v);
189         if ((drv = parse_driver(k, v, "command")))
190                 return parse_string(&drv->external, k, v);
191         if ((drv = parse_driver(k, v, "textconv")))
192                 return parse_string(&drv->textconv, k, v);
193         if ((drv = parse_driver(k, v, "cachetextconv")))
194                 return parse_bool(&drv->textconv_want_cache, k, v);
195         if ((drv = parse_driver(k, v, "wordregex")))
196                 return parse_string(&drv->word_regex, k, v);
197
198         return 0;
199 }
200
201 struct userdiff_driver *userdiff_find_by_name(const char *name) {
202         int len = strlen(name);
203         return userdiff_find_by_namelen(name, len);
204 }
205
206 struct userdiff_driver *userdiff_find_by_path(const char *path)
207 {
208         static struct git_attr *attr;
209         struct git_attr_check check;
210
211         if (!attr)
212                 attr = git_attr("diff");
213         check.attr = attr;
214
215         if (!path)
216                 return NULL;
217         if (git_checkattr(path, 1, &check))
218                 return NULL;
219
220         if (ATTR_TRUE(check.value))
221                 return &driver_true;
222         if (ATTR_FALSE(check.value))
223                 return &driver_false;
224         if (ATTR_UNSET(check.value))
225                 return NULL;
226         return userdiff_find_by_name(check.value);
227 }