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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 | ||
96 | static void list_commands(const char *exec_path, const char *pattern) | |
97 | { | |
98 | unsigned int longest = 0; | |
99 | char path[PATH_MAX]; | |
100 | int dirlen; | |
101 | DIR *dir = opendir(exec_path); | |
102 | struct dirent *de; | |
103 | ||
104 | if (!dir) { | |
105 | fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno)); | |
106 | exit(1); | |
107 | } | |
108 | ||
109 | dirlen = strlen(exec_path); | |
110 | if (PATH_MAX - 20 < dirlen) { | |
111 | fprintf(stderr, "git: insanely long exec-path '%s'\n", | |
112 | exec_path); | |
113 | exit(1); | |
114 | } | |
115 | ||
116 | memcpy(path, exec_path, dirlen); | |
117 | path[dirlen++] = '/'; | |
118 | ||
119 | while ((de = readdir(dir)) != NULL) { | |
120 | struct stat st; | |
121 | int entlen; | |
122 | ||
cc44c765 | 123 | if (prefixcmp(de->d_name, "git-")) |
70827b15 LT |
124 | continue; |
125 | strcpy(path+dirlen, de->d_name); | |
126 | if (stat(path, &st) || /* stat, not lstat */ | |
127 | !S_ISREG(st.st_mode) || | |
128 | !(st.st_mode & S_IXUSR)) | |
129 | continue; | |
130 | ||
131 | entlen = strlen(de->d_name); | |
5bb1cda5 | 132 | if (has_extension(de->d_name, ".exe")) |
70827b15 LT |
133 | entlen -= 4; |
134 | ||
135 | if (longest < entlen) | |
136 | longest = entlen; | |
137 | ||
138 | add_cmdname(de->d_name + 4, entlen-4); | |
139 | } | |
140 | closedir(dir); | |
141 | ||
142 | printf("git commands available in '%s'\n", exec_path); | |
143 | printf("----------------------------"); | |
144 | mput_char('-', strlen(exec_path)); | |
145 | putchar('\n'); | |
146 | pretty_print_string_list(cmdname, longest - 4); | |
147 | putchar('\n'); | |
148 | } | |
149 | ||
150 | static void list_common_cmds_help(void) | |
151 | { | |
152 | int i, longest = 0; | |
153 | ||
154 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
155 | if (longest < strlen(common_cmds[i].name)) | |
156 | longest = strlen(common_cmds[i].name); | |
157 | } | |
158 | ||
159 | puts("The most commonly used git commands are:"); | |
160 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
4f75b115 RS |
161 | printf(" %s ", common_cmds[i].name); |
162 | mput_char(' ', longest - strlen(common_cmds[i].name)); | |
70827b15 LT |
163 | puts(common_cmds[i].help); |
164 | } | |
165 | puts("(use 'git help -a' to get a list of all installed git commands)"); | |
166 | } | |
167 | ||
70827b15 LT |
168 | static void show_man_page(const char *git_cmd) |
169 | { | |
170 | const char *page; | |
171 | ||
cc44c765 | 172 | if (!prefixcmp(git_cmd, "git")) |
70827b15 LT |
173 | page = git_cmd; |
174 | else { | |
175 | int page_len = strlen(git_cmd) + 4; | |
2d7320d0 | 176 | char *p = xmalloc(page_len + 1); |
70827b15 LT |
177 | strcpy(p, "git-"); |
178 | strcpy(p + 4, git_cmd); | |
179 | p[page_len] = 0; | |
180 | page = p; | |
181 | } | |
182 | ||
183 | execlp("man", "man", page, NULL); | |
184 | } | |
185 | ||
822a7d50 RJ |
186 | void help_unknown_cmd(const char *cmd) |
187 | { | |
188 | printf("git: '%s' is not a git-command\n\n", cmd); | |
189 | list_common_cmds_help(); | |
190 | exit(1); | |
191 | } | |
192 | ||
a633fca0 | 193 | int cmd_version(int argc, const char **argv, const char *prefix) |
70827b15 LT |
194 | { |
195 | printf("git version %s\n", git_version_string); | |
196 | return 0; | |
197 | } | |
198 | ||
a633fca0 | 199 | int cmd_help(int argc, const char **argv, const char *prefix) |
70827b15 | 200 | { |
6acbcb92 | 201 | const char *help_cmd = argc > 1 ? argv[1] : NULL; |
822a7d50 RJ |
202 | const char *exec_path = git_exec_path(); |
203 | ||
204 | if (!help_cmd) { | |
205 | printf("usage: %s\n\n", git_usage_string); | |
206 | list_common_cmds_help(); | |
207 | exit(1); | |
208 | } | |
209 | ||
210 | else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) { | |
211 | printf("usage: %s\n\n", git_usage_string); | |
212 | if(exec_path) | |
213 | list_commands(exec_path, "git-*"); | |
214 | exit(1); | |
215 | } | |
216 | ||
70827b15 LT |
217 | else |
218 | show_man_page(help_cmd); | |
822a7d50 | 219 | |
70827b15 LT |
220 | return 0; |
221 | } |