Merge branch 'jh/status-aheadbehind'
[git] / userdiff.c
1 #include "cache.h"
2 #include "config.h"
3 #include "userdiff.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 },            \
12           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
13 #define IPATTERN(name, pattern, word_regex)                     \
14         { name, NULL, -1, { pattern, REG_EXTENDED | REG_ICASE }, \
15           word_regex "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+" }
16 static struct userdiff_driver builtin_drivers[] = {
17 IPATTERN("ada",
18          "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n"
19          "!^[ \t]*with[ \t].*$\n"
20          "^[ \t]*((procedure|function)[ \t]+.*)$\n"
21          "^[ \t]*((package|protected|task)[ \t]+.*)$",
22          /* -- */
23          "[a-zA-Z][a-zA-Z0-9_]*"
24          "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?"
25          "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"),
26 IPATTERN("fortran",
27          "!^([C*]|[ \t]*!)\n"
28          "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n"
29          "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA"
30                 "|([^'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$",
31          /* -- */
32          "[a-zA-Z][a-zA-Z0-9_]*"
33          "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
34          /* numbers and format statements like 2E14.4, or ES12.6, 9X.
35           * Don't worry about format statements without leading digits since
36           * they would have been matched above as a variable anyway. */
37          "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
38          "|//|\\*\\*|::|[/<>=]="),
39 IPATTERN("fountain", "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$",
40          "[^ \t-]+"),
41 PATTERNS("golang",
42          /* Functions */
43          "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n"
44          /* Structs and interfaces */
45          "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)",
46          /* -- */
47          "[a-zA-Z_][a-zA-Z0-9_]*"
48          "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?"
49          "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"),
50 PATTERNS("html", "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$",
51          "[^<>= \t]+"),
52 PATTERNS("java",
53          "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
54          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$",
55          /* -- */
56          "[a-zA-Z_][a-zA-Z0-9_]*"
57          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
58          "|[-+*/<>%&^|=!]="
59          "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"),
60 PATTERNS("matlab",
61          /*
62           * Octave pattern is mostly the same as matlab, except that '%%%' and
63           * '##' can also be used to begin code sections, in addition to '%%'
64           * that is understood by both.
65           */
66          "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$",
67          "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"),
68 PATTERNS("objc",
69          /* Negate C statements that can look like functions */
70          "!^[ \t]*(do|for|if|else|return|switch|while)\n"
71          /* Objective-C methods */
72          "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
73          /* C functions */
74          "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n"
75          /* Objective-C class/protocol definitions */
76          "^(@(implementation|interface|protocol)[ \t].*)$",
77          /* -- */
78          "[a-zA-Z_][a-zA-Z0-9_]*"
79          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
80          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
81 PATTERNS("pascal",
82          "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface|"
83                 "implementation|initialization|finalization)[ \t]*.*)$"
84          "\n"
85          "^(.*=[ \t]*(class|record).*)$",
86          /* -- */
87          "[a-zA-Z_][a-zA-Z0-9_]*"
88          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
89          "|<>|<=|>=|:=|\\.\\."),
90 PATTERNS("perl",
91          "^package .*\n"
92          "^sub [[:alnum:]_':]+[ \t]*"
93                 "(\\([^)]*\\)[ \t]*)?" /* prototype */
94                 /*
95                  * Attributes.  A regex can't count nested parentheses,
96                  * so just slurp up whatever we see, taking care not
97                  * to accept lines like "sub foo; # defined elsewhere".
98                  *
99                  * An attribute could contain a semicolon, but at that
100                  * point it seems reasonable enough to give up.
101                  */
102                 "(:[^;#]*)?"
103                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
104                 "(#.*)?$\n" /* comment */
105          "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*"
106                 "(\\{[ \t]*)?" /* brace can come here or on the next line */
107                 "(#.*)?$\n"
108          "^=head[0-9] .*",      /* POD */
109          /* -- */
110          "[[:alpha:]_'][[:alnum:]_']*"
111          "|0[xb]?[0-9a-fA-F_]*"
112          /* taking care not to interpret 3..5 as (3.)(.5) */
113          "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?"
114          "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::"
115          "|&&=|\\|\\|=|//=|\\*\\*="
116          "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?"
117          "|[-+*/%.^&<>=!|]="
118          "|=~|!~"
119          "|<<|<>|<=>|>>"),
120 PATTERNS("php",
121          "^[\t ]*(((public|protected|private|static)[\t ]+)*function.*)$\n"
122          "^[\t ]*((((final|abstract)[\t ]+)?class|interface|trait).*)$",
123          /* -- */
124          "[a-zA-Z_][a-zA-Z0-9_]*"
125          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+"
126          "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"),
127 PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
128          /* -- */
129          "[a-zA-Z_][a-zA-Z0-9_]*"
130          "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
131          "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"),
132          /* -- */
133 PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
134          /* -- */
135          "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*"
136          "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?."
137          "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"),
138 PATTERNS("rust",
139          "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl)[< \t]+[^;]*)$",
140          /* -- */
141          "[a-zA-Z_][a-zA-Z0-9_]*"
142          "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?"
143          "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"),
144 PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
145          "[={}\"]|[^={}\" \t]+"),
146 PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
147          "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+"),
148 PATTERNS("cpp",
149          /* Jump targets or access declarations */
150          "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n"
151          /* functions/methods, variables, and compounds at top level */
152          "^((::[[:space:]]*)?[A-Za-z_].*)$",
153          /* -- */
154          "[a-zA-Z_][a-zA-Z0-9_]*"
155          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lLuU]*"
156          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*"),
157 PATTERNS("csharp",
158          /* Keywords */
159          "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
160          /* Methods and constructors */
161          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe|async)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\n"
162          /* Properties */
163          "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[@._[:alnum:]]+)[ \t]*$\n"
164          /* Type definitions */
165          "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct)[ \t]+.*)$\n"
166          /* Namespace */
167          "^[ \t]*(namespace[ \t]+.*)$",
168          /* -- */
169          "[a-zA-Z_][a-zA-Z0-9_]*"
170          "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
171          "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"),
172 IPATTERN("css",
173          "![:;][[:space:]]*$\n"
174          "^[_a-z0-9].*$",
175          /* -- */
176          /*
177           * This regex comes from W3C CSS specs. Should theoretically also
178           * allow ISO 10646 characters U+00A0 and higher,
179           * but they are not handled in this regex.
180           */
181          "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
182          "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
183 ),
184 { "default", NULL, -1, { NULL, 0 } },
185 };
186 #undef PATTERNS
187 #undef IPATTERN
188
189 static struct userdiff_driver driver_true = {
190         "diff=true",
191         NULL,
192         0,
193         { NULL, 0 }
194 };
195
196 static struct userdiff_driver driver_false = {
197         "!diff",
198         NULL,
199         1,
200         { NULL, 0 }
201 };
202
203 static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
204 {
205         int i;
206         for (i = 0; i < ndrivers; i++) {
207                 struct userdiff_driver *drv = drivers + i;
208                 if (!strncmp(drv->name, k, len) && !drv->name[len])
209                         return drv;
210         }
211         for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
212                 struct userdiff_driver *drv = builtin_drivers + i;
213                 if (!strncmp(drv->name, k, len) && !drv->name[len])
214                         return drv;
215         }
216         return NULL;
217 }
218
219 static int parse_funcname(struct userdiff_funcname *f, const char *k,
220                 const char *v, int cflags)
221 {
222         if (git_config_string(&f->pattern, k, v) < 0)
223                 return -1;
224         f->cflags = cflags;
225         return 0;
226 }
227
228 static int parse_tristate(int *b, const char *k, const char *v)
229 {
230         if (v && !strcasecmp(v, "auto"))
231                 *b = -1;
232         else
233                 *b = git_config_bool(k, v);
234         return 0;
235 }
236
237 static int parse_bool(int *b, const char *k, const char *v)
238 {
239         *b = git_config_bool(k, v);
240         return 0;
241 }
242
243 int userdiff_config(const char *k, const char *v)
244 {
245         struct userdiff_driver *drv;
246         const char *name, *type;
247         int namelen;
248
249         if (parse_config_key(k, "diff", &name, &namelen, &type) || !name)
250                 return 0;
251
252         drv = userdiff_find_by_namelen(name, namelen);
253         if (!drv) {
254                 ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
255                 drv = &drivers[ndrivers++];
256                 memset(drv, 0, sizeof(*drv));
257                 drv->name = xmemdupz(name, namelen);
258                 drv->binary = -1;
259         }
260
261         if (!strcmp(type, "funcname"))
262                 return parse_funcname(&drv->funcname, k, v, 0);
263         if (!strcmp(type, "xfuncname"))
264                 return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
265         if (!strcmp(type, "binary"))
266                 return parse_tristate(&drv->binary, k, v);
267         if (!strcmp(type, "command"))
268                 return git_config_string(&drv->external, k, v);
269         if (!strcmp(type, "textconv"))
270                 return git_config_string(&drv->textconv, k, v);
271         if (!strcmp(type, "cachetextconv"))
272                 return parse_bool(&drv->textconv_want_cache, k, v);
273         if (!strcmp(type, "wordregex"))
274                 return git_config_string(&drv->word_regex, k, v);
275
276         return 0;
277 }
278
279 struct userdiff_driver *userdiff_find_by_name(const char *name)
280 {
281         int len = strlen(name);
282         return userdiff_find_by_namelen(name, len);
283 }
284
285 struct userdiff_driver *userdiff_find_by_path(struct index_state *istate,
286                                               const char *path)
287 {
288         static struct attr_check *check;
289
290         if (!check)
291                 check = attr_check_initl("diff", NULL);
292         if (!path)
293                 return NULL;
294         git_check_attr(istate, path, check);
295
296         if (ATTR_TRUE(check->items[0].value))
297                 return &driver_true;
298         if (ATTR_FALSE(check->items[0].value))
299                 return &driver_false;
300         if (ATTR_UNSET(check->items[0].value))
301                 return NULL;
302         return userdiff_find_by_name(check->items[0].value);
303 }
304
305 struct userdiff_driver *userdiff_get_textconv(struct repository *r,
306                                               struct userdiff_driver *driver)
307 {
308         if (!driver->textconv)
309                 return NULL;
310
311         if (driver->textconv_want_cache && !driver->textconv_cache) {
312                 struct notes_cache *c = xmalloc(sizeof(*c));
313                 struct strbuf name = STRBUF_INIT;
314
315                 strbuf_addf(&name, "textconv/%s", driver->name);
316                 notes_cache_init(r, c, name.buf, driver->textconv);
317                 driver->textconv_cache = c;
318                 strbuf_release(&name);
319         }
320
321         return driver;
322 }