Merge branch 'jc/index-update-if-able' 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          "^(((class[ \t]+)?(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("perl",
65          "^[ \t]*package .*;\n"
66          "^[ \t]*sub .* \\{\n"
67          "^[A-Z]+ \\{\n"        /* BEGIN, END, ... */
68          "^=head[0-9] ",        /* POD */
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:]]"),
81 PATTERNS("php",
82          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
83          "^[\t ]*(class.*)$",
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].*)$",
90          /* -- */
91          "[a-zA-Z_][a-zA-Z0-9_]*"
92          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
93          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
94          "|[^[:space:]]|[\x80-\xff]+"),
95          /* -- */
96 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
97          /* -- */
98          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
99          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
100          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"
101          "|[^[:space:]]|[\x80-\xff]+"),
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)[^;]*)$",
113          /* -- */
114          "[a-zA-Z_][a-zA-Z0-9_]*"
115          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
116          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
117          "|[^[:space:]]|[\x80-\xff]+"),
118 PATTERNS("csharp",
119          /* Keywords */
120          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
121          /* Methods and constructors */
122          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\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]+"),
134 { "default", NULL, -1, { NULL, 0 } },
135 };
136 #undef PATTERNS
137 #undef IPATTERN
138
139 static struct userdiff_driver driver_true = {
140         "diff=true",
141         NULL,
142         0,
143         { NULL, 0 }
144 };
145
146 static struct userdiff_driver driver_false = {
147         "!diff",
148         NULL,
149         1,
150         { NULL, 0 }
151 };
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);
193                 drv->binary = -1;
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
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
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
229 int userdiff_config(const char *k, const char *v)
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);
237         if ((drv = parse_driver(k, v, "binary")))
238                 return parse_tristate(&drv->binary, k, v);
239         if ((drv = parse_driver(k, v, "command")))
240                 return parse_string(&drv->external, k, v);
241         if ((drv = parse_driver(k, v, "textconv")))
242                 return parse_string(&drv->textconv, k, v);
243         if ((drv = parse_driver(k, v, "cachetextconv")))
244                 return parse_bool(&drv->textconv_want_cache, k, v);
245         if ((drv = parse_driver(k, v, "wordregex")))
246                 return parse_string(&drv->word_regex, k, v);
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)
262                 attr = git_attr("diff");
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 }