X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=git.c;h=0b40e3060d8d95a6da7c8603317c6e2cb6c5ec46;hb=692c7fc9cb81a2f68b23199d5b8612494fe4d317;hp=d18980135f469338cc65051c2c6664d2ac5d3838;hpb=8e49d50388211a0f3e7286f6ee600bf7736f4814;p=git.git

diff --git a/git.c b/git.c
index d1898013..0b40e306 100644
--- a/git.c
+++ b/git.c
@@ -1,11 +1,21 @@
 #include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdarg.h>
-#include <glob.h>
+#include <sys/ioctl.h>
+#include "git-compat-util.h"
+#include "exec_cmd.h"
+#include "common-cmds.h"
+
+#include "cache.h"
+#include "commit.h"
+#include "revision.h"
 
 #ifndef PATH_MAX
 # define PATH_MAX 4096
@@ -14,12 +24,6 @@
 static const char git_usage[] =
 	"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
 
-struct string_list {
-	size_t len;
-	char *str;
-	struct string_list *next;
-};
-
 /* most gui terms set COLUMNS (although some don't export it) */
 static int term_columns(void)
 {
@@ -29,33 +33,86 @@ static int term_columns(void)
 	if (col_string && (n_cols = atoi(col_string)) > 0)
 		return n_cols;
 
+#ifdef TIOCGWINSZ
+	{
+		struct winsize ws;
+		if (!ioctl(1, TIOCGWINSZ, &ws)) {
+			if (ws.ws_col)
+				return ws.ws_col;
+		}
+	}
+#endif
+
 	return 80;
 }
 
+static void oom(void)
+{
+	fprintf(stderr, "git: out of memory\n");
+	exit(1);
+}
+
 static inline void mput_char(char c, unsigned int num)
 {
 	while(num--)
 		putchar(c);
 }
 
-static void pretty_print_string_list(struct string_list *list, int longest)
+static struct cmdname {
+	size_t len;
+	char name[1];
+} **cmdname;
+static int cmdname_alloc, cmdname_cnt;
+
+static void add_cmdname(const char *name, int len)
+{
+	struct cmdname *ent;
+	if (cmdname_alloc <= cmdname_cnt) {
+		cmdname_alloc = cmdname_alloc + 200;
+		cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
+		if (!cmdname)
+			oom();
+	}
+	ent = malloc(sizeof(*ent) + len);
+	if (!ent)
+		oom();
+	ent->len = len;
+	memcpy(ent->name, name, len);
+	ent->name[len] = 0;
+	cmdname[cmdname_cnt++] = ent;
+}
+
+static int cmdname_compare(const void *a_, const void *b_)
+{
+	struct cmdname *a = *(struct cmdname **)a_;
+	struct cmdname *b = *(struct cmdname **)b_;
+	return strcmp(a->name, b->name);
+}
+
+static void pretty_print_string_list(struct cmdname **cmdname, int longest)
 {
-	int cols = 1;
+	int cols = 1, rows;
 	int space = longest + 1; /* min 1 SP between words */
 	int max_cols = term_columns() - 1; /* don't print *on* the edge */
+	int i, j;
 
 	if (space < max_cols)
 		cols = max_cols / space;
+	rows = (cmdname_cnt + cols - 1) / cols;
 
-	while (list) {
-		int c;
-		printf("  ");
+	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
 
-		for (c = cols; c && list; list = list->next) {
-			printf("%s", list->str);
+	for (i = 0; i < rows; i++) {
+		printf("  ");
 
-			if (--c)
-				mput_char(' ', space - list->len);
+		for (j = 0; j < cols; j++) {
+			int n = j * rows + i;
+			int size = space;
+			if (n >= cmdname_cnt)
+				break;
+			if (j == cols-1 || n + rows >= cmdname_cnt)
+				size = 1;
+			printf("%-*s", size, cmdname[n]->name);
 		}
 		putchar('\n');
 	}
@@ -63,62 +120,81 @@ static void pretty_print_string_list(struct string_list *list, int longest)
 
 static void list_commands(const char *exec_path, const char *pattern)
 {
-	struct string_list *list = NULL, *tail = NULL;
-	unsigned int longest = 0, i;
-	glob_t gl;
-
-	if (chdir(exec_path) < 0) {
-		printf("git: '%s': %s\n", exec_path, strerror(errno));
+	unsigned int longest = 0;
+	char path[PATH_MAX];
+	int dirlen;
+	DIR *dir = opendir(exec_path);
+	struct dirent *de;
+
+	if (!dir) {
+		fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
 		exit(1);
 	}
 
-	i = glob(pattern, 0, NULL, &gl);
-	switch(i) {
-	case GLOB_NOSPACE:
-		puts("Out of memory when running glob()");
-		exit(2);
-	case GLOB_ABORTED:
-		printf("'%s': Read error: %s\n", exec_path, strerror(errno));
-		exit(2);
-	case GLOB_NOMATCH:
-		printf("No git commands available in '%s'.\n", exec_path);
-		printf("Do you need to specify --exec-path or set GIT_EXEC_PATH?\n");
+	dirlen = strlen(exec_path);
+	if (PATH_MAX - 20 < dirlen) {
+		fprintf(stderr, "git: insanely long exec-path '%s'\n",
+			exec_path);
 		exit(1);
 	}
 
-	for (i = 0; i < gl.gl_pathc; i++) {
-		int len = strlen(gl.gl_pathv[i] + 4);
+	memcpy(path, exec_path, dirlen);
+	path[dirlen++] = '/';
 
-		if (access(gl.gl_pathv[i], X_OK))
+	while ((de = readdir(dir)) != NULL) {
+		struct stat st;
+		int entlen;
+
+		if (strncmp(de->d_name, "git-", 4))
+			continue;
+		strcpy(path+dirlen, de->d_name);
+		if (stat(path, &st) || /* stat, not lstat */
+		    !S_ISREG(st.st_mode) ||
+		    !(st.st_mode & S_IXUSR))
 			continue;
 
-		if (longest < len)
-			longest = len;
+		entlen = strlen(de->d_name);
+		if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
+			entlen -= 4;
 
-		if (!tail)
-			tail = list = malloc(sizeof(struct string_list));
-		else {
-			tail->next = malloc(sizeof(struct string_list));
-			tail = tail->next;
-		}
-		tail->len = len;
-		tail->str = gl.gl_pathv[i] + 4;
-		tail->next = NULL;
+		if (longest < entlen)
+			longest = entlen;
+
+		add_cmdname(de->d_name + 4, entlen-4);
 	}
+	closedir(dir);
 
 	printf("git commands available in '%s'\n", exec_path);
 	printf("----------------------------");
 	mput_char('-', strlen(exec_path));
 	putchar('\n');
-	pretty_print_string_list(list, longest);
+	pretty_print_string_list(cmdname, longest - 4);
 	putchar('\n');
 }
 
+static void list_common_cmds_help()
+{
+	int i, longest = 0;
+
+	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		if (longest < strlen(common_cmds[i].name))
+			longest = strlen(common_cmds[i].name);
+	}
+
+	puts("The most commonly used git commands are:");
+	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		printf("    %s", common_cmds[i].name);
+		mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
+		puts(common_cmds[i].help);
+	}
+	puts("(use 'git help -a' to get a list of all installed git commands)");
+}
+
 #ifdef __GNUC__
-static void usage(const char *exec_path, const char *fmt, ...)
-	__attribute__((__format__(__printf__, 2, 3), __noreturn__));
+static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
+	__attribute__((__format__(__printf__, 3, 4), __noreturn__));
 #endif
-static void usage(const char *exec_path, const char *fmt, ...)
+static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
 {
 	if (fmt) {
 		va_list ap;
@@ -132,10 +208,13 @@ static void usage(const char *exec_path, const char *fmt, ...)
 	else
 		puts(git_usage);
 
-	putchar('\n');
-
-	if(exec_path)
-		list_commands(exec_path, "git-*");
+	if (exec_path) {
+		putchar('\n');
+		if (show_all)
+			list_commands(exec_path, "git-*");
+		else
+			list_common_cmds_help();
+        }
 
 	exit(1);
 }
@@ -146,12 +225,11 @@ static void prepend_to_path(const char *dir, int len)
 	int path_len = len;
 
 	if (!old_path)
-		old_path = "/bin:/usr/bin:.";
+		old_path = "/usr/local/bin:/usr/bin:/bin";
 
 	path_len = len + strlen(old_path) + 1;
 
 	path = malloc(path_len + 1);
-	path[path_len + 1] = '\0';
 
 	memcpy(path, dir, len);
 	path[len] = ':';
@@ -160,70 +238,238 @@ static void prepend_to_path(const char *dir, int len)
 	setenv("PATH", path, 1);
 }
 
-int main(int argc, char **argv, char **envp)
+static void show_man_page(const char *git_cmd)
 {
-	char git_command[PATH_MAX + 1];
-	char wd[PATH_MAX + 1];
-	int i, len, show_help = 0;
-	char *exec_path = getenv("GIT_EXEC_PATH");
+	const char *page;
+
+	if (!strncmp(git_cmd, "git", 3))
+		page = git_cmd;
+	else {
+		int page_len = strlen(git_cmd) + 4;
+		char *p = malloc(page_len + 1);
+		strcpy(p, "git-");
+		strcpy(p + 4, git_cmd);
+		p[page_len] = 0;
+		page = p;
+	}
 
-	getcwd(wd, PATH_MAX);
+	execlp("man", "man", page, NULL);
+}
 
-	if (!exec_path)
-		exec_path = GIT_EXEC_PATH;
+static int cmd_version(int argc, const char **argv, char **envp)
+{
+	printf("git version %s\n", GIT_VERSION);
+	return 0;
+}
 
-	for (i = 1; i < argc; i++) {
-		char *arg = argv[i];
+static int cmd_help(int argc, const char **argv, char **envp)
+{
+	const char *help_cmd = argv[1];
+	if (!help_cmd)
+		cmd_usage(0, git_exec_path(), NULL);
+	else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
+		cmd_usage(1, git_exec_path(), NULL);
+	else
+		show_man_page(help_cmd);
+	return 0;
+}
 
-		if (strncmp(arg, "--", 2))
-			break;
+#define LOGSIZE (65536)
 
-		arg += 2;
+static int cmd_log(int argc, const char **argv, char **envp)
+{
+	struct rev_info rev;
+	struct commit *commit;
+	char *buf = xmalloc(LOGSIZE);
+	static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
+	int abbrev = DEFAULT_ABBREV;
+	int show_parents = 0;
+	const char *commit_prefix = "commit ";
+
+	argc = setup_revisions(argc, argv, &rev, "HEAD");
+	while (1 < argc) {
+		const char *arg = argv[1];
+		if (!strncmp(arg, "--pretty", 8)) {
+			commit_format = get_commit_format(arg + 8);
+			if (commit_format == CMIT_FMT_ONELINE)
+				commit_prefix = "";
+		}
+		else if (!strcmp(arg, "--parents")) {
+			show_parents = 1;
+		}
+		else if (!strcmp(arg, "--no-abbrev")) {
+			abbrev = 0;
+		}
+		else if (!strncmp(arg, "--abbrev=", 9)) {
+			abbrev = strtoul(arg + 9, NULL, 10);
+			if (abbrev && abbrev < MINIMUM_ABBREV)
+				abbrev = MINIMUM_ABBREV;
+			else if (40 < abbrev)
+				abbrev = 40;
+		}
+		else
+			die("unrecognized argument: %s", arg);
+		argc--; argv++;
+	}
 
-		if (!strncmp(arg, "exec-path", 9)) {
-			arg += 9;
-			if (*arg == '=')
-				exec_path = arg + 1;
-			else {
-				puts(exec_path);
-				exit(0);
+	prepare_revision_walk(&rev);
+	setup_pager();
+	while ((commit = get_revision(&rev)) != NULL) {
+		printf("%s%s", commit_prefix,
+		       sha1_to_hex(commit->object.sha1));
+		if (show_parents) {
+			struct commit_list *parents = commit->parents;
+			while (parents) {
+				struct object *o = &(parents->item->object);
+				parents = parents->next;
+				if (o->flags & TMP_MARK)
+					continue;
+				printf(" %s", sha1_to_hex(o->sha1));
+				o->flags |= TMP_MARK;
 			}
+			/* TMP_MARK is a general purpose flag that can
+			 * be used locally, but the user should clean
+			 * things up after it is done with them.
+			 */
+			for (parents = commit->parents;
+			     parents;
+			     parents = parents->next)
+				parents->item->object.flags &= ~TMP_MARK;
 		}
-		else if (!strcmp(arg, "version")) {
-			printf("git version %s\n", GIT_VERSION);
-			exit(0);
-		}
-		else if (!strcmp(arg, "help"))
-			show_help = 1;
-		else if (!show_help)
-			usage(NULL, NULL);
+		if (commit_format == CMIT_FMT_ONELINE)
+			putchar(' ');
+		else
+			putchar('\n');
+		pretty_print_commit(commit_format, commit, ~0, buf,
+				    LOGSIZE, abbrev);
+		printf("%s\n", buf);
 	}
+	free(buf);
+	return 0;
+}
 
-	if (i >= argc || show_help)
-		usage(exec_path, NULL);
+static void handle_internal_command(int argc, const char **argv, char **envp)
+{
+	const char *cmd = argv[0];
+	static struct cmd_struct {
+		const char *cmd;
+		int (*fn)(int, const char **, char **);
+	} commands[] = {
+		{ "version", cmd_version },
+		{ "help", cmd_help },
+		{ "log", cmd_log },
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(commands); i++) {
+		struct cmd_struct *p = commands+i;
+		if (strcmp(p->cmd, cmd))
+			continue;
+		exit(p->fn(argc, argv, envp));
+	}
+}
 
-	/* allow relative paths, but run with exact */
-	if (chdir(exec_path)) {
-		printf("git: '%s': %s\n", exec_path, strerror(errno));
-		exit (1);
+int main(int argc, const char **argv, char **envp)
+{
+	const char *cmd = argv[0];
+	char *slash = strrchr(cmd, '/');
+	char git_command[PATH_MAX + 1];
+	const char *exec_path = NULL;
+
+	/*
+	 * Take the basename of argv[0] as the command
+	 * name, and the dirname as the default exec_path
+	 * if it's an absolute path and we don't have
+	 * anything better.
+	 */
+	if (slash) {
+		*slash++ = 0;
+		if (*cmd == '/')
+			exec_path = cmd;
+		cmd = slash;
 	}
 
-	getcwd(git_command, sizeof(git_command));
-	chdir(wd);
+	/*
+	 * "git-xxxx" is the same as "git xxxx", but we obviously:
+	 *
+	 *  - cannot take flags in between the "git" and the "xxxx".
+	 *  - cannot execute it externally (since it would just do
+	 *    the same thing over again)
+	 *
+	 * So we just directly call the internal command handler, and
+	 * die if that one cannot handle it.
+	 */
+	if (!strncmp(cmd, "git-", 4)) {
+		cmd += 4;
+		argv[0] = cmd;
+		handle_internal_command(argc, argv, envp);
+		die("cannot handle %s internally", cmd);
+	}
 
-	len = strlen(git_command);
-	prepend_to_path(git_command, len);
+	/* Default command: "help" */
+	cmd = "help";
 
-	strncat(&git_command[len], "/git-", sizeof(git_command) - len);
-	len += 5;
-	strncat(&git_command[len], argv[i], sizeof(git_command) - len);
+	/* Look for flags.. */
+	while (argc > 1) {
+		cmd = *++argv;
+		argc--;
 
-	if (access(git_command, X_OK))
-		usage(exec_path, "'%s' is not a git-command", argv[i]);
+		if (strncmp(cmd, "--", 2))
+			break;
 
-	/* execve() can only ever return if it fails */
-	execve(git_command, &argv[i], envp);
-	printf("Failed to run command '%s': %s\n", git_command, strerror(errno));
+		cmd += 2;
+
+		/*
+		 * For legacy reasons, the "version" and "help"
+		 * commands can be written with "--" prepended
+		 * to make them look like flags.
+		 */
+		if (!strcmp(cmd, "help"))
+			break;
+		if (!strcmp(cmd, "version"))
+			break;
+
+		/*
+		 * Check remaining flags (which by now must be
+		 * "--exec-path", but maybe we will accept
+		 * other arguments some day)
+		 */
+		if (!strncmp(cmd, "exec-path", 9)) {
+			cmd += 9;
+			if (*cmd == '=') {
+				git_set_exec_path(cmd + 1);
+				continue;
+			}
+			puts(git_exec_path());
+			exit(0);
+		}
+		cmd_usage(0, NULL, NULL);
+	}
+	argv[0] = cmd;
+
+	/*
+	 * We search for git commands in the following order:
+	 *  - git_exec_path()
+	 *  - the path of the "git" command if we could find it
+	 *    in $0
+	 *  - the regular PATH.
+	 */
+	if (exec_path)
+		prepend_to_path(exec_path, strlen(exec_path));
+	exec_path = git_exec_path();
+	prepend_to_path(exec_path, strlen(exec_path));
+
+	/* See if it's an internal command */
+	handle_internal_command(argc, argv, envp);
+
+	/* .. then try the external ones */
+	execv_git_cmd(argv);
+
+	if (errno == ENOENT)
+		cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
+
+	fprintf(stderr, "Failed to run command '%s': %s\n",
+		git_command, strerror(errno));
 
 	return 1;
 }