mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Jeff King](/assets/img/avatar_default.png)
The convention for helper scripts has been git-$TOOL--$HELPER. Since this is a "browse" helper for the "help" tool, git-help--browse is a more sensible name. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
399 lines
8.3 KiB
C
399 lines
8.3 KiB
C
/*
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* builtin-help.c
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*
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* Builtin help-related commands (help, usage, version)
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "exec_cmd.h"
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#include "common-cmds.h"
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static const char *help_default_format;
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static enum help_format {
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man_format,
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info_format,
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web_format,
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} help_format = man_format;
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static void parse_help_format(const char *format)
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{
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if (!format) {
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help_format = man_format;
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return;
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}
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if (!strcmp(format, "man")) {
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help_format = man_format;
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return;
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}
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if (!strcmp(format, "info")) {
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help_format = info_format;
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return;
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}
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if (!strcmp(format, "web") || !strcmp(format, "html")) {
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help_format = web_format;
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return;
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}
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die("unrecognized help format '%s'", format);
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}
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static int git_help_config(const char *var, const char *value)
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{
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if (!strcmp(var, "help.format")) {
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help_default_format = xstrdup(value);
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return 0;
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}
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return git_default_config(var, value);
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}
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/* most GUI terminals set COLUMNS (although some don't export it) */
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static int term_columns(void)
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{
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char *col_string = getenv("COLUMNS");
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int n_cols;
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if (col_string && (n_cols = atoi(col_string)) > 0)
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return n_cols;
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#ifdef TIOCGWINSZ
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{
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struct winsize ws;
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if (!ioctl(1, TIOCGWINSZ, &ws)) {
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if (ws.ws_col)
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return ws.ws_col;
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}
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}
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#endif
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return 80;
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}
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static inline void mput_char(char c, unsigned int num)
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{
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while(num--)
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putchar(c);
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}
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static struct cmdnames {
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int alloc;
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int cnt;
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struct cmdname {
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size_t len;
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char name[1];
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} **names;
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} main_cmds, other_cmds;
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static void add_cmdname(struct cmdnames *cmds, const char *name, int len)
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{
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struct cmdname *ent = xmalloc(sizeof(*ent) + len);
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ent->len = len;
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memcpy(ent->name, name, len);
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ent->name[len] = 0;
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ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
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cmds->names[cmds->cnt++] = ent;
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}
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static int cmdname_compare(const void *a_, const void *b_)
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{
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struct cmdname *a = *(struct cmdname **)a_;
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struct cmdname *b = *(struct cmdname **)b_;
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return strcmp(a->name, b->name);
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}
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static void uniq(struct cmdnames *cmds)
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{
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int i, j;
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if (!cmds->cnt)
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return;
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for (i = j = 1; i < cmds->cnt; i++)
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if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
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cmds->names[j++] = cmds->names[i];
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cmds->cnt = j;
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}
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static void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
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{
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int ci, cj, ei;
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int cmp;
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ci = cj = ei = 0;
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while (ci < cmds->cnt && ei < excludes->cnt) {
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cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
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if (cmp < 0)
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cmds->names[cj++] = cmds->names[ci++];
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else if (cmp == 0)
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ci++, ei++;
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else if (cmp > 0)
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ei++;
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}
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while (ci < cmds->cnt)
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cmds->names[cj++] = cmds->names[ci++];
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cmds->cnt = cj;
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}
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static void pretty_print_string_list(struct cmdnames *cmds, int longest)
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{
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int cols = 1, rows;
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int space = longest + 1; /* min 1 SP between words */
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int max_cols = term_columns() - 1; /* don't print *on* the edge */
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int i, j;
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if (space < max_cols)
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cols = max_cols / space;
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rows = (cmds->cnt + cols - 1) / cols;
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for (i = 0; i < rows; i++) {
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printf(" ");
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for (j = 0; j < cols; j++) {
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int n = j * rows + i;
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int size = space;
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if (n >= cmds->cnt)
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break;
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if (j == cols-1 || n + rows >= cmds->cnt)
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size = 1;
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printf("%-*s", size, cmds->names[n]->name);
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}
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putchar('\n');
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}
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}
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static unsigned int list_commands_in_dir(struct cmdnames *cmds,
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const char *path)
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{
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unsigned int longest = 0;
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const char *prefix = "git-";
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int prefix_len = strlen(prefix);
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DIR *dir = opendir(path);
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struct dirent *de;
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if (!dir || chdir(path))
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return 0;
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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int entlen;
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if (prefixcmp(de->d_name, prefix))
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continue;
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if (stat(de->d_name, &st) || /* stat, not lstat */
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!S_ISREG(st.st_mode) ||
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!(st.st_mode & S_IXUSR))
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continue;
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entlen = strlen(de->d_name) - prefix_len;
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if (has_extension(de->d_name, ".exe"))
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entlen -= 4;
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if (longest < entlen)
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longest = entlen;
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add_cmdname(cmds, de->d_name + prefix_len, entlen);
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}
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closedir(dir);
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return longest;
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}
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static void list_commands(void)
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{
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unsigned int longest = 0;
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unsigned int len;
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const char *env_path = getenv("PATH");
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char *paths, *path, *colon;
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const char *exec_path = git_exec_path();
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if (exec_path)
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longest = list_commands_in_dir(&main_cmds, exec_path);
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if (!env_path) {
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fprintf(stderr, "PATH not set\n");
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exit(1);
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}
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path = paths = xstrdup(env_path);
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while (1) {
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if ((colon = strchr(path, ':')))
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*colon = 0;
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len = list_commands_in_dir(&other_cmds, path);
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if (len > longest)
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longest = len;
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if (!colon)
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break;
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path = colon + 1;
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}
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free(paths);
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qsort(main_cmds.names, main_cmds.cnt,
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sizeof(*main_cmds.names), cmdname_compare);
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uniq(&main_cmds);
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qsort(other_cmds.names, other_cmds.cnt,
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sizeof(*other_cmds.names), cmdname_compare);
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uniq(&other_cmds);
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exclude_cmds(&other_cmds, &main_cmds);
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if (main_cmds.cnt) {
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printf("available git commands in '%s'\n", exec_path);
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printf("----------------------------");
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mput_char('-', strlen(exec_path));
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putchar('\n');
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pretty_print_string_list(&main_cmds, longest);
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putchar('\n');
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}
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if (other_cmds.cnt) {
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printf("git commands available from elsewhere on your $PATH\n");
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printf("---------------------------------------------------\n");
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pretty_print_string_list(&other_cmds, longest);
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putchar('\n');
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}
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}
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void list_common_cmds_help(void)
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{
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int i, longest = 0;
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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if (longest < strlen(common_cmds[i].name))
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longest = strlen(common_cmds[i].name);
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}
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puts("The most commonly used git commands are:");
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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printf(" %s ", common_cmds[i].name);
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mput_char(' ', longest - strlen(common_cmds[i].name));
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puts(common_cmds[i].help);
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}
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}
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static const char *cmd_to_page(const char *git_cmd)
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{
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if (!git_cmd)
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return "git";
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else if (!prefixcmp(git_cmd, "git"))
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return git_cmd;
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else {
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int page_len = strlen(git_cmd) + 4;
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char *p = xmalloc(page_len + 1);
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strcpy(p, "git-");
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strcpy(p + 4, git_cmd);
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p[page_len] = 0;
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return p;
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}
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}
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static void setup_man_path(void)
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{
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struct strbuf new_path;
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const char *old_path = getenv("MANPATH");
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strbuf_init(&new_path, 0);
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/* We should always put ':' after our path. If there is no
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* old_path, the ':' at the end will let 'man' to try
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* system-wide paths after ours to find the manual page. If
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* there is old_path, we need ':' as delimiter. */
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strbuf_addstr(&new_path, GIT_MAN_PATH);
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strbuf_addch(&new_path, ':');
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if (old_path)
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strbuf_addstr(&new_path, old_path);
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setenv("MANPATH", new_path.buf, 1);
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strbuf_release(&new_path);
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}
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static void show_man_page(const char *git_cmd)
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{
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const char *page = cmd_to_page(git_cmd);
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setup_man_path();
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execlp("man", "man", page, NULL);
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}
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static void show_info_page(const char *git_cmd)
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{
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const char *page = cmd_to_page(git_cmd);
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setenv("INFOPATH", GIT_INFO_PATH, 1);
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execlp("info", "info", "gitman", page, NULL);
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}
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static void show_html_page(const char *git_cmd)
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{
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const char *page = cmd_to_page(git_cmd);
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execl_git_cmd("help--browse", page, NULL);
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}
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void help_unknown_cmd(const char *cmd)
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{
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fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
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exit(1);
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}
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int cmd_version(int argc, const char **argv, const char *prefix)
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{
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printf("git version %s\n", git_version_string);
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return 0;
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}
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int cmd_help(int argc, const char **argv, const char *prefix)
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{
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const char *help_cmd = argv[1];
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if (argc < 2) {
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printf("usage: %s\n\n", git_usage_string);
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list_common_cmds_help();
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exit(0);
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}
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if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
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printf("usage: %s\n\n", git_usage_string);
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list_commands();
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}
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else if (!strcmp(help_cmd, "--web") || !strcmp(help_cmd, "-w")) {
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show_html_page(argc > 2 ? argv[2] : NULL);
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}
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else if (!strcmp(help_cmd, "--info") || !strcmp(help_cmd, "-i")) {
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show_info_page(argc > 2 ? argv[2] : NULL);
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}
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else if (!strcmp(help_cmd, "--man") || !strcmp(help_cmd, "-m")) {
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show_man_page(argc > 2 ? argv[2] : NULL);
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}
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else {
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int nongit;
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setup_git_directory_gently(&nongit);
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git_config(git_help_config);
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if (help_default_format)
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parse_help_format(help_default_format);
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switch (help_format) {
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case man_format:
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show_man_page(help_cmd);
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break;
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case info_format:
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show_info_page(help_cmd);
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break;
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case web_format:
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show_html_page(help_cmd);
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break;
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}
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}
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return 0;
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}
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