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![Junio C Hamano](/assets/img/avatar_default.png)
This attempts to set up built-in "git grep" to further reduce our dependence on the shell, while at the same time optionally allowing to run grep against object database. You could do funky things like these: git grep --cached -e pattern ;# grep from index git grep -e pattern master ;# or in a rev git grep -e pattern master next ;# or in multiple revs git grep -e pattern pu^@ ;# even like this with an ;# extension from another topic ;-) git grep -e pattern master..next ;# or even from rev ranges git grep -e pattern master~20:Documentation ;# or an arbitrary tree git grep -e pattern next:git-commit.sh ;# or an arbitrary blob Right now, it does not understand and/or obey many options grep should accept, and the pattern must be given with -e option due to the way the parameter parser is structured, both of which obviously need to be fixed for usability. But this is going in the right direction. The shell script version is one of the worst Portability offender in the git barebone Porcelainish; it uses xargs -0 to pass paths around and shell arrays to sift flags and parameters. Signed-off-by: Junio C Hamano <junkio@cox.net>
171 lines
3.6 KiB
C
171 lines
3.6 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include "git-compat-util.h"
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#include "exec_cmd.h"
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#include "builtin.h"
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static void prepend_to_path(const char *dir, int len)
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{
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char *path, *old_path = getenv("PATH");
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int path_len = len;
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if (!old_path)
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old_path = "/usr/local/bin:/usr/bin:/bin";
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path_len = len + strlen(old_path) + 1;
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path = malloc(path_len + 1);
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memcpy(path, dir, len);
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path[len] = ':';
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memcpy(path + len + 1, old_path, path_len - len);
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setenv("PATH", path, 1);
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}
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const char git_version_string[] = GIT_VERSION;
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static void handle_internal_command(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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static struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, char **);
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} commands[] = {
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{ "version", cmd_version },
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{ "help", cmd_help },
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{ "log", cmd_log },
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{ "whatchanged", cmd_whatchanged },
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{ "show", cmd_show },
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{ "grep", cmd_grep },
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};
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int i;
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/* Turn "git cmd --help" into "git help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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if (strcmp(p->cmd, cmd))
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continue;
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exit(p->fn(argc, argv, envp));
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}
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}
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int main(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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char *slash = strrchr(cmd, '/');
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char git_command[PATH_MAX + 1];
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const char *exec_path = NULL;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if it's an absolute path and we don't have
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* anything better.
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*/
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if (slash) {
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*slash++ = 0;
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if (*cmd == '/')
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exec_path = cmd;
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!strncmp(cmd, "git-", 4)) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv, envp);
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die("cannot handle %s internally", cmd);
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}
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/* Default command: "help" */
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cmd = "help";
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/* Look for flags.. */
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while (argc > 1) {
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cmd = *++argv;
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argc--;
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if (strncmp(cmd, "--", 2))
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break;
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cmd += 2;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "help"))
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break;
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if (!strcmp(cmd, "version"))
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break;
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/*
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* Check remaining flags (which by now must be
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* "--exec-path", but maybe we will accept
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* other arguments some day)
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*/
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if (!strncmp(cmd, "exec-path", 9)) {
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cmd += 9;
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if (*cmd == '=') {
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git_set_exec_path(cmd + 1);
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continue;
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}
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puts(git_exec_path());
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exit(0);
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}
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cmd_usage(0, NULL, NULL);
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}
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argv[0] = cmd;
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/*
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* We search for git commands in the following order:
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* - git_exec_path()
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* - the path of the "git" command if we could find it
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* in $0
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* - the regular PATH.
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*/
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if (exec_path)
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prepend_to_path(exec_path, strlen(exec_path));
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exec_path = git_exec_path();
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prepend_to_path(exec_path, strlen(exec_path));
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/* See if it's an internal command */
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handle_internal_command(argc, argv, envp);
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/* .. then try the external ones */
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execv_git_cmd(argv);
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if (errno == ENOENT)
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cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
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fprintf(stderr, "Failed to run command '%s': %s\n",
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git_command, strerror(errno));
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return 1;
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}
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