Andrew's git / gitweb.git / userdiff.c
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userdiff.con commit docs: fix filter-branch subdir example for exotic repo names (6cb0186)
   1#include "cache.h"
   2#include "userdiff.h"
   3#include "cache.h"
   4#include "attr.h"
   5
   6static struct userdiff_driver *drivers;
   7static int ndrivers;
   8static 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 }
  14static struct userdiff_driver builtin_drivers[] = {
  15IPATTERN("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].*)$",
  20         /* -- */
  21         "[a-zA-Z][a-zA-Z0-9_]*"
  22         "|\\.([Ee][Qq]|[Nn][Ee]|[Gg][TtEe]|[Ll][TtEe]|[Tt][Rr][Uu][Ee]|[Ff][Aa][Ll][Ss][Ee]|[Aa][Nn][Dd]|[Oo][Rr]|[Nn]?[Ee][Qq][Vv]|[Nn][Oo][Tt])\\."
  23         /* numbers and format statements like 2E14.4, or ES12.6, 9X.
  24          * Don't worry about format statements without leading digits since
  25          * they would have been matched above as a variable anyway. */
  26         "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?"
  27         "|//|\\*\\*|::|[/<>=]="
  28         "|[^[:space:]]|[\x80-\xff]+"),
  29PATTERNS("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$",
  30         "[^<>= \t]+|[^[:space:]]|[\x80-\xff]+"),
  31PATTERNS("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]*\\([^;]*)$",
  34         /* -- */
  35         "[a-zA-Z_][a-zA-Z0-9_]*"
  36         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
  37         "|[-+*/<>%&^|=!]="
  38         "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"
  39         "|[^[:space:]]|[\x80-\xff]+"),
  40PATTERNS("objc",
  41         /* Negate C statements that can look like functions */
  42         "!^[ \t]*(do|for|if|else|return|switch|while)\n"
  43         /* Objective-C methods */
  44         "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\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]+"),
  54PATTERNS("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]+"),
  64PATTERNS("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:]]"),
  81PATTERNS("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]+"),
  89PATTERNS("python", "^[ \t]*((class|def)[ \t].*)$",
  90         /* -- */
  91         "[a-zA-Z_][a-zA-Z0-9_]*"
  92         "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?"
  93         "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"
  94         "|[^[:space:]]|[\x80-\xff]+"),
  95         /* -- */
  96PATTERNS("ruby", "^[ \t]*((class|module|def)[ \t].*)$",
  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]+"),
 102PATTERNS("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$",
 103         "[={}\"]|[^={}\" \t]+"),
 104PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
 105         "\\\\[a-zA-Z@]+|\\\\.|[a-zA-Z0-9\x80-\xff]+|[^[:space:]]"),
 106PATTERNS("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)[^;]*)$",
 113         /* -- */
 114         "[a-zA-Z_][a-zA-Z0-9_]*"
 115         "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?"
 116         "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"
 117         "|[^[:space:]]|[\x80-\xff]+"),
 118PATTERNS("csharp",
 119         /* Keywords */
 120         "!^[ \t]*(do|while|for|if|else|instanceof|new|return|switch|case|throw|catch|using)\n"
 121         /* Methods and constructors */
 122         "^[ \t]*(((static|public|internal|private|protected|new|virtual|sealed|override|unsafe)[ \t]+)*[][<>@.~_[:alnum:]]+[ \t]+[<>@._[:alnum:]]+[ \t]*\\(.*\\))[ \t]*$\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
 139static struct userdiff_driver driver_true = {
 140        "diff=true",
 141        NULL,
 142        0,
 143        { NULL, 0 }
 144};
 145
 146static struct userdiff_driver driver_false = {
 147        "!diff",
 148        NULL,
 149        1,
 150        { NULL, 0 }
 151};
 152
 153static 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
 169static 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
 198static 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
 207static 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
 214static 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
 223static int parse_bool(int *b, const char *k, const char *v)
 224{
 225        *b = git_config_bool(k, v);
 226        return 1;
 227}
 228
 229int 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
 251struct userdiff_driver *userdiff_find_by_name(const char *name) {
 252        int len = strlen(name);
 253        return userdiff_find_by_namelen(name, len);
 254}
 255
 256struct 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}