Code

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