diff options
Diffstat (limited to 'userdiff.c')
| -rw-r--r-- | userdiff.c | 589 |
1 files changed, 589 insertions, 0 deletions
diff --git a/userdiff.c b/userdiff.c new file mode 100644 index 0000000000..fe710a68bf --- /dev/null +++ b/userdiff.c @@ -0,0 +1,589 @@ +#define USE_THE_REPOSITORY_VARIABLE +#define DISABLE_SIGN_COMPARE_WARNINGS + +#include "git-compat-util.h" +#include "config.h" +#include "userdiff.h" +#include "attr.h" +#include "strbuf.h" +#include "environment.h" + +static struct userdiff_driver *drivers; +static int ndrivers; +static int drivers_alloc; + +#define PATTERNS(lang, rx, wrx) { \ + .name = lang, \ + .binary = -1, \ + .funcname = { \ + .pattern = rx, \ + .cflags = REG_EXTENDED, \ + }, \ + .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \ + .word_regex_multi_byte = wrx "|[^[:space:]]", \ +} +#define IPATTERN(lang, rx, wrx) { \ + .name = lang, \ + .binary = -1, \ + .funcname = { \ + .pattern = rx, \ + .cflags = REG_EXTENDED | REG_ICASE, \ + }, \ + .word_regex = wrx "|[^[:space:]]|[\xc0-\xff][\x80-\xbf]+", \ + .word_regex_multi_byte = wrx "|[^[:space:]]", \ +} + +/* + * Built-in drivers for various languages, sorted by their names + * (except that the "default" is left at the end). + * + * When writing or updating patterns, assume that the contents these + * patterns are applied to are syntactically correct. The patterns + * can be simple without implementing all syntactical corner cases, as + * long as they are sufficiently permissive. + */ +static struct userdiff_driver builtin_drivers[] = { +IPATTERN("ada", + "!^(.*[ \t])?(is[ \t]+new|renames|is[ \t]+separate)([ \t].*)?$\n" + "!^[ \t]*with[ \t].*$\n" + "^[ \t]*((procedure|function)[ \t]+.*)$\n" + "^[ \t]*((package|protected|task)[ \t]+.*)$", + /* -- */ + "[a-zA-Z][a-zA-Z0-9_]*" + "|[-+]?[0-9][0-9#_.aAbBcCdDeEfF]*([eE][+-]?[0-9_]+)?" + "|=>|\\.\\.|\\*\\*|:=|/=|>=|<=|<<|>>|<>"), +PATTERNS("bash", + /* Optional leading indentation */ + "^[ \t]*" + /* Start of captured text */ + "(" + "(" + /* POSIX identifier with mandatory parentheses */ + "([a-zA-Z_][a-zA-Z0-9_]*[ \t]*\\([ \t]*\\))" + "|" + /* Bashism identifier with optional parentheses */ + "(function[ \t]+[a-zA-Z_][a-zA-Z0-9_]*(([ \t]*\\([ \t]*\\))|([ \t]+)))" + ")" + /* Everything after the function header is captured */ + ".*$" + /* End of captured text */ + ")", + /* -- */ + /* Identifiers: variable and function names */ + "[a-zA-Z_][a-zA-Z0-9_]*" + /* Shell variables: $VAR, ${VAR} */ + "|\\$[a-zA-Z0-9_]+|\\$\\{" + /*Command list separators and redirection operators */ + "|\\|\\||&&|<<|>>" + /* Operators ending in '=' (comparison + compound assignment) */ + "|==|!=|<=|>=|[-+*/%&|^]=" + /* Additional parameter expansion operators */ + "|:=|:-|:\\+|:\\?|##|%%|\\^\\^|,," + /* Command-line options (to avoid splitting -option) */ + "|[-a-zA-Z0-9_]+" + /* Brackets and grouping symbols */ + "|\\(|\\)|\\{|\\}|\\[|\\]"), +PATTERNS("bibtex", + "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$", + /* -- */ + "[={}\"]|[^={}\" \t]+"), +PATTERNS("cpp", + /* Jump targets or access declarations */ + "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])\n" + /* functions/methods, variables, and compounds at top level */ + "^((::[[:space:]]*)?[A-Za-z_].*)$", + /* -- */ + /* identifiers and keywords */ + "[a-zA-Z_][a-zA-Z0-9_]*" + /* decimal and octal integers as well as floatingpoint numbers */ + "|[0-9][0-9.]*([Ee][-+]?[0-9]+)?[fFlLuU]*" + /* hexadecimal and binary integers */ + "|0[xXbB][0-9a-fA-F]+[lLuU]*" + /* floatingpoint numbers that begin with a decimal point */ + "|\\.[0-9][0-9]*([Ee][-+]?[0-9]+)?[fFlL]?" + "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->\\*?|\\.\\*|<=>"), +PATTERNS("csharp", + /* + * Jump over reserved keywords which are illegal method names, but which + * can be followed by parentheses without special characters in between, + * making them look like methods. + */ + "!(^|[ \t]+)" /* Start of line or whitespace. */ + "(do|while|for|foreach|if|else|new|default|return|switch|case|throw" + "|catch|using|lock|fixed)" + "([ \t(]+|$)\n" /* Whitespace, "(", or end of line. */ + /* + * Methods/constructors: + * The strategy is to identify a minimum of two groups (any combination + * of keywords/type/name) before the opening parenthesis, and without + * final unexpected characters, normally only used in ordinary statements. + */ + "^[ \t]*" /* Remove leading whitespace. */ + "(" /* Start chunk header capture. */ + "(" /* First group. */ + "[][[:alnum:]@_.]" /* Name. */ + "(<[][[:alnum:]@_, \t<>]+>)?" /* Optional generic parameters. */ + ")+" + "([ \t]+" /* Subsequent groups, prepended with space. */ + "([][[:alnum:]@_.](<[][[:alnum:]@_, \t<>]+>)?)+" + ")+" + "[ \t]*" /* Optional space before parameters start. */ + "\\(" /* Start of method parameters. */ + "[^;]*" /* Allow complex parameters, but exclude statements (;). */ + ")$\n" /* Close chunk header capture. */ + /* + * Properties: + * As with methods, expect a minimum of two groups. But, more trivial than + * methods, the vast majority of properties long enough to be worth + * showing a chunk header for don't include "=:;,()" on the line they are + * defined, since they don't have a parameter list. + */ + "^[ \t]*(" + "([][[:alnum:]@_.](<[][[:alnum:]@_, \t<>]+>)?)+" + "([ \t]+" + "([][[:alnum:]@_.](<[][[:alnum:]@_, \t<>]+>)?)+" + ")+" /* Up to here, same as methods regex. */ + "[^;=:,()]*" /* Compared to methods, no parameter list allowed. */ + ")$\n" + /* Type definitions */ + "^[ \t]*(((static|public|internal|private|protected|new|unsafe|sealed|abstract|partial)[ \t]+)*(class|enum|interface|struct|record)[ \t]+.*)$\n" + /* Namespace */ + "^[ \t]*(namespace[ \t]+.*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?" + "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"), +IPATTERN("css", + "![:;][[:space:]]*$\n" + "^[:[@.#]?[_a-z0-9].*$", + /* -- */ + /* + * This regex comes from W3C CSS specs. Should theoretically also + * allow ISO 10646 characters U+00A0 and higher, + * but they are not handled in this regex. + */ + "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */ + "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */ +), +PATTERNS("dts", + "!;\n" + "!=\n" + /* lines beginning with a word optionally preceded by '&' or the root */ + "^[ \t]*((/[ \t]*\\{|&?[a-zA-Z_]).*)", + /* -- */ + /* Property names and math operators */ + "[a-zA-Z0-9,._+?#-]+" + "|[-+*/%&^|!~]|>>|<<|&&|\\|\\|"), +PATTERNS("elixir", + "^[ \t]*((def(macro|module|impl|protocol|p)?|test)[ \t].*)$", + /* -- */ + /* Atoms, names, and module attributes */ + "[@:]?[a-zA-Z0-9@_?!]+" + /* Numbers with specific base */ + "|[-+]?0[xob][0-9a-fA-F]+" + /* Numbers */ + "|[-+]?[0-9][0-9_.]*([eE][-+]?[0-9_]+)?" + /* Operators and atoms that represent them */ + "|:?(\\+\\+|--|\\.\\.|~~~|<>|\\^\\^\\^|<?\\|>|<<<?|>?>>|<<?~|~>?>|<~>|<=|>=|===?|!==?|=~|&&&?|\\|\\|\\|?|=>|<-|\\\\\\\\|->)" + /* Not real operators, but should be grouped */ + "|:?%[A-Za-z0-9_.]\\{\\}?"), +IPATTERN("fortran", + /* Don't match comment lines */ + "!^([C*]|[ \t]*!)\n" + /* Don't match 'module procedure' lines */ + "!^[ \t]*MODULE[ \t]+PROCEDURE[ \t]\n" + /* Program, module, block data */ + "^[ \t]*((END[ \t]+)?(PROGRAM|MODULE|BLOCK[ \t]+DATA" + /* Subroutines and functions */ + "|([^!'\" \t]+[ \t]+)*(SUBROUTINE|FUNCTION))[ \t]+[A-Z].*)$", + /* -- */ + "[a-zA-Z][a-zA-Z0-9_]*" + "|\\.([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])\\." + /* numbers and format statements like 2E14.4, or ES12.6, 9X. + * Don't worry about format statements without leading digits since + * they would have been matched above as a variable anyway. */ + "|[-+]?[0-9.]+([AaIiDdEeFfLlTtXx][Ss]?[-+]?[0-9.]*)?(_[a-zA-Z0-9][a-zA-Z0-9_]*)?" + "|//|\\*\\*|::|[/<>=]="), +IPATTERN("fountain", + "^((\\.[^.]|(int|ext|est|int\\.?/ext|i/e)[. ]).*)$", + /* -- */ + "[^ \t-]+"), +PATTERNS("golang", + /* Functions */ + "^[ \t]*(func[ \t]*.*(\\{[ \t]*)?)\n" + /* Structs and interfaces */ + "^[ \t]*(type[ \t].*(struct|interface)[ \t]*(\\{[ \t]*)?)", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.eE]+i?|0[xX]?[0-9a-fA-F]+i?" + "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&\\^=?|&&|\\|\\||<-|\\.{3}"), +PATTERNS("html", + "^[ \t]*(<[Hh][1-6]([ \t].*)?>.*)$", + /* -- */ + "[^<>= \t]+"), +PATTERNS("ini", + "^[ \t]*\\[[^]]+\\]", + /* -- */ + "[^ \t]+"), +PATTERNS("java", + "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n" + /* Class, enum, interface, and record declarations */ + "^[ \t]*(([a-z-]+[ \t]+)*(class|enum|interface|record)[ \t]+.*)$\n" + /* Method definitions; note that constructor signatures are not */ + /* matched because they are indistinguishable from method calls. */ + "^[ \t]*(([A-Za-z_<>&][][?&<>.,A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?" + "|[-+*/<>%&^|=!]=" + "|--|\\+\\+|<<=?|>>>?=?|&&|\\|\\|"), +PATTERNS("kotlin", + "^[ \t]*(([a-z]+[ \t]+)*(fun|class|interface)[ \t]+.*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + /* hexadecimal and binary numbers */ + "|0[xXbB][0-9a-fA-F_]+[lLuU]*" + /* integers and floats */ + "|[0-9][0-9_]*([.][0-9_]*)?([Ee][-+]?[0-9]+)?[fFlLuU]*" + /* floating point numbers beginning with decimal point */ + "|[.][0-9][0-9_]*([Ee][-+]?[0-9]+)?[fFlLuU]?" + /* unary and binary operators */ + "|[-+*/<>%&^|=!]==?|--|\\+\\+|<<=|>>=|&&|\\|\\||->|\\.\\*|!!|[?:.][.:]"), +PATTERNS("markdown", + "^ {0,3}#{1,6}[ \t].*", + /* -- */ + "[^<>= \t]+"), +PATTERNS("matlab", + /* + * Octave pattern is mostly the same as matlab, except that '%%%' and + * '##' can also be used to begin code sections, in addition to '%%' + * that is understood by both. + */ + "^[[:space:]]*((classdef|function)[[:space:]].*)$|^(%%%?|##)[[:space:]].*$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*|[-+0-9.e]+|[=~<>]=|\\.[*/\\^']|\\|\\||&&"), +PATTERNS("objc", + /* Negate C statements that can look like functions */ + "!^[ \t]*(do|for|if|else|return|switch|while)\n" + /* Objective-C methods */ + "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n" + /* C functions */ + "^[ \t]*(([A-Za-z_][A-Za-z_0-9]*[ \t]+)+[A-Za-z_][A-Za-z_0-9]*[ \t]*\\([^;]*)$\n" + /* Objective-C class/protocol definitions */ + "^(@(implementation|interface|protocol)[ \t].*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+[fFlL]?|0[xXbB]?[0-9a-fA-F]+[lL]?" + "|[-+*/<>%&^|=!]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\||::|->"), +PATTERNS("pascal", + "^(((class[ \t]+)?(procedure|function)|constructor|destructor|interface" + "|implementation|initialization|finalization)[ \t]*.*)$\n" + "^(.*=[ \t]*(class|record).*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+" + "|<>|<=|>=|:=|\\.\\."), +PATTERNS("perl", + "^package .*\n" + "^sub [[:alnum:]_':]+[ \t]*" + "(\\([^)]*\\)[ \t]*)?" /* prototype */ + /* + * Attributes. A regex can't count nested parentheses, + * so just slurp up whatever we see, taking care not + * to accept lines like "sub foo; # defined elsewhere". + * + * An attribute could contain a semicolon, but at that + * point it seems reasonable enough to give up. + */ + "(:[^;#]*)?" + "(\\{[ \t]*)?" /* brace can come here or on the next line */ + "(#.*)?$\n" /* comment */ + "^(BEGIN|END|INIT|CHECK|UNITCHECK|AUTOLOAD|DESTROY)[ \t]*" + "(\\{[ \t]*)?" /* brace can come here or on the next line */ + "(#.*)?$\n" + "^=head[0-9] .*", /* POD */ + /* -- */ + "[[:alpha:]_'][[:alnum:]_']*" + "|0[xb]?[0-9a-fA-F_]*" + /* taking care not to interpret 3..5 as (3.)(.5) */ + "|[0-9a-fA-F_]+(\\.[0-9a-fA-F_]+)?([eE][-+]?[0-9_]+)?" + "|=>|-[rwxoRWXOezsfdlpSugkbctTBMAC>]|~~|::" + "|&&=|\\|\\|=|//=|\\*\\*=" + "|&&|\\|\\||//|\\+\\+|--|\\*\\*|\\.\\.\\.?" + "|[-+*/%.^&<>=!|]=" + "|=~|!~" + "|<<|<>|<=>|>>"), +PATTERNS("php", + "^[\t ]*(((public|protected|private|static|abstract|final)[\t ]+)*function.*)$\n" + "^[\t ]*((((final|abstract)[\t ]+)?class|enum|interface|trait).*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+" + "|[-+*/<>%&^|=!.]=|--|\\+\\+|<<=?|>>=?|===|&&|\\|\\||::|->"), +PATTERNS("python", + "^[ \t]*((class|(async[ \t]+)?def)[ \t].*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+[jJlL]?|0[xX]?[0-9a-fA-F]+[lL]?" + "|[-+*/<>%&^|=!]=|//=?|<<=?|>>=?|\\*\\*=?"), + /* -- */ +PATTERNS("r", + "^[ \t]*([a-zA-z][a-zA-Z0-9_.]*[ \t]*(<-|=)[ \t]*function.*)$", + /* -- */ + "[^ \t]+"), +PATTERNS("ruby", + "^[ \t]*((class|module|def)[ \t].*)$", + /* -- */ + "(@|@@|\\$)?[a-zA-Z_][a-zA-Z0-9_]*" + "|[-+0-9.e]+|0[xXbB]?[0-9a-fA-F]+|\\?(\\\\C-)?(\\\\M-)?." + "|//=?|[-+*/<>%&^|=!]=|<<=?|>>=?|===|\\.{1,3}|::|[!=]~"), +PATTERNS("rust", + "^[\t ]*((pub(\\([^\\)]+\\))?[\t ]+)?((async|const|unsafe|extern([\t ]+\"[^\"]+\"))[\t ]+)?(struct|enum|union|mod|trait|fn|impl|macro_rules!)[< \t]+[^;]*)$", + /* -- */ + "[a-zA-Z_][a-zA-Z0-9_]*" + "|[0-9][0-9_a-fA-Fiosuxz]*(\\.([0-9]*[eE][+-]?)?[0-9_fF]*)?" + "|[-+*\\/<>%&^|=!:]=|<<=?|>>=?|&&|\\|\\||->|=>|\\.{2}=|\\.{3}|::"), +PATTERNS("scheme", + "^[\t ]*(\\(((define|def(struct|syntax|class|method|rules|record|proto|alias)?)[-*/ \t]|(library|module|struct|class)[*+ \t]).*)$", + /* + * R7RS valid identifiers include any sequence enclosed + * within vertical lines having no backslashes + */ + "\\|([^\\\\]*)\\|" + /* All other words should be delimited by spaces or parentheses */ + "|([^][)(}{[ \t])+"), +PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$", + "\\\\[a-zA-Z@]+|\\\\.|([a-zA-Z0-9]|[^\x01-\x7f])+"), +{ .name = "default", .binary = -1 }, +}; +#undef PATTERNS +#undef IPATTERN + +static struct userdiff_driver driver_true = { + .name = "diff=true", + .binary = 0, +}; + +static struct userdiff_driver driver_false = { + .name = "!diff", + .binary = 1, +}; + +struct find_by_namelen_data { + const char *name; + size_t len; + struct userdiff_driver *driver; +}; + +static int userdiff_find_by_namelen_cb(struct userdiff_driver *driver, + enum userdiff_driver_type type UNUSED, + void *priv) +{ + struct find_by_namelen_data *cb_data = priv; + + if (!xstrncmpz(driver->name, cb_data->name, cb_data->len)) { + cb_data->driver = driver; + return 1; /* tell the caller to stop iterating */ + } + return 0; +} + +static int regexec_supports_multi_byte_chars(void) +{ + static const char not_space[] = "[^[:space:]]"; + static const char utf8_multi_byte_char[] = "\xc2\xa3"; + regex_t re; + regmatch_t match; + static int result = -1; + + if (result != -1) + return result; + if (regcomp(&re, not_space, REG_EXTENDED)) + BUG("invalid regular expression: %s", not_space); + result = !regexec(&re, utf8_multi_byte_char, 1, &match, 0) && + match.rm_so == 0 && + match.rm_eo == strlen(utf8_multi_byte_char); + regfree(&re); + return result; +} + +static struct userdiff_driver *userdiff_find_by_namelen(const char *name, size_t len) +{ + struct find_by_namelen_data udcbdata = { + .name = name, + .len = len, + }; + for_each_userdiff_driver(userdiff_find_by_namelen_cb, &udcbdata); + return udcbdata.driver; +} + +static int parse_funcname(struct userdiff_funcname *f, const char *k, + const char *v, int cflags) +{ + f->pattern = NULL; + FREE_AND_NULL(f->pattern_owned); + if (git_config_string(&f->pattern_owned, k, v) < 0) + return -1; + f->pattern = f->pattern_owned; + f->cflags = cflags; + return 0; +} + +static int parse_tristate(int *b, const char *k, const char *v) +{ + if (v && !strcasecmp(v, "auto")) + *b = -1; + else + *b = git_config_bool(k, v); + return 0; +} + +static int parse_bool(int *b, const char *k, const char *v) +{ + *b = git_config_bool(k, v); + return 0; +} + +int userdiff_config(const char *k, const char *v) +{ + struct userdiff_driver *drv; + const char *name, *type; + size_t namelen; + + if (parse_config_key(k, "diff", &name, &namelen, &type) || !name) + return 0; + + drv = userdiff_find_by_namelen(name, namelen); + if (!drv) { + ALLOC_GROW(drivers, ndrivers+1, drivers_alloc); + drv = &drivers[ndrivers++]; + memset(drv, 0, sizeof(*drv)); + drv->name = xmemdupz(name, namelen); + drv->binary = -1; + } + + if (!strcmp(type, "funcname")) + return parse_funcname(&drv->funcname, k, v, 0); + if (!strcmp(type, "xfuncname")) + return parse_funcname(&drv->funcname, k, v, REG_EXTENDED); + if (!strcmp(type, "binary")) + return parse_tristate(&drv->binary, k, v); + if (!strcmp(type, "command")) { + FREE_AND_NULL(drv->external.cmd); + return git_config_string(&drv->external.cmd, k, v); + } + if (!strcmp(type, "trustexitcode")) { + drv->external.trust_exit_code = git_config_bool(k, v); + return 0; + } + if (!strcmp(type, "textconv")) { + int ret; + FREE_AND_NULL(drv->textconv_owned); + ret = git_config_string(&drv->textconv_owned, k, v); + drv->textconv = drv->textconv_owned; + return ret; + } + if (!strcmp(type, "cachetextconv")) + return parse_bool(&drv->textconv_want_cache, k, v); + if (!strcmp(type, "wordregex")) { + int ret; + FREE_AND_NULL(drv->word_regex_owned); + ret = git_config_string(&drv->word_regex_owned, k, v); + drv->word_regex = drv->word_regex_owned; + return ret; + } + if (!strcmp(type, "algorithm")) { + int ret; + FREE_AND_NULL(drv->algorithm_owned); + ret = git_config_string(&drv->algorithm_owned, k, v); + drv->algorithm = drv->algorithm_owned; + return ret; + } + + return 0; +} + +struct userdiff_driver *userdiff_find_by_name(const char *name) +{ + int len = strlen(name); + struct userdiff_driver *driver = userdiff_find_by_namelen(name, len); + if (driver && driver->word_regex_multi_byte) { + if (regexec_supports_multi_byte_chars()) + driver->word_regex = driver->word_regex_multi_byte; + driver->word_regex_multi_byte = NULL; + } + return driver; +} + +struct userdiff_driver *userdiff_find_by_path(struct index_state *istate, + const char *path) +{ + static struct attr_check *check; + + if (!check) + check = attr_check_initl("diff", NULL); + if (!path) + return NULL; + git_check_attr(istate, path, check); + + if (ATTR_TRUE(check->items[0].value)) + return &driver_true; + if (ATTR_FALSE(check->items[0].value)) + return &driver_false; + if (ATTR_UNSET(check->items[0].value)) + return NULL; + return userdiff_find_by_name(check->items[0].value); +} + +struct userdiff_driver *userdiff_get_textconv(struct repository *r, + struct userdiff_driver *driver) +{ + if (!driver->textconv) + return NULL; + + if (driver->textconv_want_cache && !driver->textconv_cache && + have_git_dir()) { + struct notes_cache *c = xmalloc(sizeof(*c)); + struct strbuf name = STRBUF_INIT; + + strbuf_addf(&name, "textconv/%s", driver->name); + notes_cache_init(r, c, name.buf, driver->textconv); + driver->textconv_cache = c; + strbuf_release(&name); + } + + return driver; +} + +static int for_each_userdiff_driver_list(each_userdiff_driver_fn fn, + enum userdiff_driver_type type, void *cb_data, + struct userdiff_driver *drv, + int drv_size) +{ + int i; + int ret; + for (i = 0; i < drv_size; i++) { + struct userdiff_driver *item = drv + i; + if ((ret = fn(item, type, cb_data))) + return ret; + } + return 0; +} + +int for_each_userdiff_driver(each_userdiff_driver_fn fn, void *cb_data) +{ + int ret; + + ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_CUSTOM, + cb_data, drivers, ndrivers); + if (ret) + return ret; + + ret = for_each_userdiff_driver_list(fn, USERDIFF_DRIVER_TYPE_BUILTIN, + cb_data, builtin_drivers, + ARRAY_SIZE(builtin_drivers)); + if (ret) + return ret; + + return 0; +} |