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Commit | Line | Data |
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70827b15 LT |
1 | /* |
2 | * builtin-help.c | |
3 | * | |
4 | * Builtin help-related commands (help, usage, version) | |
5 | */ | |
6 | #include "cache.h" | |
7 | #include "builtin.h" | |
8 | #include "exec_cmd.h" | |
9 | #include "common-cmds.h" | |
85023577 | 10 | #include <sys/ioctl.h> |
70827b15 | 11 | |
82e5a82f | 12 | /* most GUI terminals set COLUMNS (although some don't export it) */ |
70827b15 LT |
13 | static int term_columns(void) |
14 | { | |
15 | char *col_string = getenv("COLUMNS"); | |
96f1e58f | 16 | int n_cols; |
70827b15 LT |
17 | |
18 | if (col_string && (n_cols = atoi(col_string)) > 0) | |
19 | return n_cols; | |
20 | ||
21 | #ifdef TIOCGWINSZ | |
22 | { | |
23 | struct winsize ws; | |
24 | if (!ioctl(1, TIOCGWINSZ, &ws)) { | |
25 | if (ws.ws_col) | |
26 | return ws.ws_col; | |
27 | } | |
28 | } | |
29 | #endif | |
30 | ||
31 | return 80; | |
32 | } | |
33 | ||
70827b15 LT |
34 | static inline void mput_char(char c, unsigned int num) |
35 | { | |
36 | while(num--) | |
37 | putchar(c); | |
38 | } | |
39 | ||
40 | static struct cmdname { | |
41 | size_t len; | |
42 | char name[1]; | |
43 | } **cmdname; | |
44 | static int cmdname_alloc, cmdname_cnt; | |
45 | ||
46 | static void add_cmdname(const char *name, int len) | |
47 | { | |
48 | struct cmdname *ent; | |
49 | if (cmdname_alloc <= cmdname_cnt) { | |
50 | cmdname_alloc = cmdname_alloc + 200; | |
c6e0caa3 | 51 | cmdname = xrealloc(cmdname, cmdname_alloc * sizeof(*cmdname)); |
70827b15 | 52 | } |
3301521a | 53 | ent = xmalloc(sizeof(*ent) + len); |
70827b15 LT |
54 | ent->len = len; |
55 | memcpy(ent->name, name, len); | |
56 | ent->name[len] = 0; | |
57 | cmdname[cmdname_cnt++] = ent; | |
58 | } | |
59 | ||
60 | static int cmdname_compare(const void *a_, const void *b_) | |
61 | { | |
62 | struct cmdname *a = *(struct cmdname **)a_; | |
63 | struct cmdname *b = *(struct cmdname **)b_; | |
64 | return strcmp(a->name, b->name); | |
65 | } | |
66 | ||
67 | static void pretty_print_string_list(struct cmdname **cmdname, int longest) | |
68 | { | |
69 | int cols = 1, rows; | |
70 | int space = longest + 1; /* min 1 SP between words */ | |
71 | int max_cols = term_columns() - 1; /* don't print *on* the edge */ | |
72 | int i, j; | |
73 | ||
74 | if (space < max_cols) | |
75 | cols = max_cols / space; | |
76 | rows = (cmdname_cnt + cols - 1) / cols; | |
77 | ||
78 | qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare); | |
79 | ||
80 | for (i = 0; i < rows; i++) { | |
81 | printf(" "); | |
82 | ||
83 | for (j = 0; j < cols; j++) { | |
84 | int n = j * rows + i; | |
85 | int size = space; | |
86 | if (n >= cmdname_cnt) | |
87 | break; | |
88 | if (j == cols-1 || n + rows >= cmdname_cnt) | |
89 | size = 1; | |
90 | printf("%-*s", size, cmdname[n]->name); | |
91 | } | |
92 | putchar('\n'); | |
93 | } | |
94 | } | |
95 | ||
edb6ddc5 | 96 | static void list_commands(const char *exec_path) |
70827b15 LT |
97 | { |
98 | unsigned int longest = 0; | |
99 | char path[PATH_MAX]; | |
edb6ddc5 SP |
100 | const char *prefix = "git-"; |
101 | int prefix_len = strlen(prefix); | |
70827b15 LT |
102 | int dirlen; |
103 | DIR *dir = opendir(exec_path); | |
104 | struct dirent *de; | |
105 | ||
106 | if (!dir) { | |
107 | fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno)); | |
108 | exit(1); | |
109 | } | |
110 | ||
111 | dirlen = strlen(exec_path); | |
112 | if (PATH_MAX - 20 < dirlen) { | |
113 | fprintf(stderr, "git: insanely long exec-path '%s'\n", | |
114 | exec_path); | |
115 | exit(1); | |
116 | } | |
117 | ||
118 | memcpy(path, exec_path, dirlen); | |
119 | path[dirlen++] = '/'; | |
120 | ||
121 | while ((de = readdir(dir)) != NULL) { | |
122 | struct stat st; | |
123 | int entlen; | |
124 | ||
edb6ddc5 | 125 | if (prefixcmp(de->d_name, prefix)) |
70827b15 LT |
126 | continue; |
127 | strcpy(path+dirlen, de->d_name); | |
128 | if (stat(path, &st) || /* stat, not lstat */ | |
129 | !S_ISREG(st.st_mode) || | |
130 | !(st.st_mode & S_IXUSR)) | |
131 | continue; | |
132 | ||
edb6ddc5 | 133 | entlen = strlen(de->d_name) - prefix_len; |
5bb1cda5 | 134 | if (has_extension(de->d_name, ".exe")) |
70827b15 LT |
135 | entlen -= 4; |
136 | ||
137 | if (longest < entlen) | |
138 | longest = entlen; | |
139 | ||
edb6ddc5 | 140 | add_cmdname(de->d_name + prefix_len, entlen); |
70827b15 LT |
141 | } |
142 | closedir(dir); | |
143 | ||
144 | printf("git commands available in '%s'\n", exec_path); | |
145 | printf("----------------------------"); | |
146 | mput_char('-', strlen(exec_path)); | |
147 | putchar('\n'); | |
edb6ddc5 | 148 | pretty_print_string_list(cmdname, longest); |
70827b15 LT |
149 | putchar('\n'); |
150 | } | |
151 | ||
3d7e2d85 | 152 | void list_common_cmds_help(void) |
70827b15 LT |
153 | { |
154 | int i, longest = 0; | |
155 | ||
156 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
157 | if (longest < strlen(common_cmds[i].name)) | |
158 | longest = strlen(common_cmds[i].name); | |
159 | } | |
160 | ||
161 | puts("The most commonly used git commands are:"); | |
162 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
4f75b115 RS |
163 | printf(" %s ", common_cmds[i].name); |
164 | mput_char(' ', longest - strlen(common_cmds[i].name)); | |
70827b15 LT |
165 | puts(common_cmds[i].help); |
166 | } | |
167 | puts("(use 'git help -a' to get a list of all installed git commands)"); | |
168 | } | |
169 | ||
70827b15 LT |
170 | static void show_man_page(const char *git_cmd) |
171 | { | |
172 | const char *page; | |
173 | ||
cc44c765 | 174 | if (!prefixcmp(git_cmd, "git")) |
70827b15 LT |
175 | page = git_cmd; |
176 | else { | |
177 | int page_len = strlen(git_cmd) + 4; | |
2d7320d0 | 178 | char *p = xmalloc(page_len + 1); |
70827b15 LT |
179 | strcpy(p, "git-"); |
180 | strcpy(p + 4, git_cmd); | |
181 | p[page_len] = 0; | |
182 | page = p; | |
183 | } | |
184 | ||
185 | execlp("man", "man", page, NULL); | |
186 | } | |
187 | ||
822a7d50 RJ |
188 | void help_unknown_cmd(const char *cmd) |
189 | { | |
a238917b | 190 | fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd); |
822a7d50 RJ |
191 | exit(1); |
192 | } | |
193 | ||
a633fca0 | 194 | int cmd_version(int argc, const char **argv, const char *prefix) |
70827b15 LT |
195 | { |
196 | printf("git version %s\n", git_version_string); | |
197 | return 0; | |
198 | } | |
199 | ||
a633fca0 | 200 | int cmd_help(int argc, const char **argv, const char *prefix) |
70827b15 | 201 | { |
6acbcb92 | 202 | const char *help_cmd = argc > 1 ? argv[1] : NULL; |
822a7d50 RJ |
203 | const char *exec_path = git_exec_path(); |
204 | ||
205 | if (!help_cmd) { | |
206 | printf("usage: %s\n\n", git_usage_string); | |
207 | list_common_cmds_help(); | |
3d7e2d85 | 208 | exit(0); |
822a7d50 RJ |
209 | } |
210 | ||
211 | else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) { | |
212 | printf("usage: %s\n\n", git_usage_string); | |
213 | if(exec_path) | |
edb6ddc5 | 214 | list_commands(exec_path); |
3d7e2d85 | 215 | exit(0); |
822a7d50 RJ |
216 | } |
217 | ||
70827b15 LT |
218 | else |
219 | show_man_page(help_cmd); | |
822a7d50 | 220 | |
70827b15 LT |
221 | return 0; |
222 | } |