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