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comparison lwlib/lw_cmdline.c @ 5:0e01d1343c02

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Added basic --help routine to lw_cmdline
author lost@l-w.ca
date Fri, 21 Jan 2011 23:19:19 -0700
parents a4812d57ed13
children 1e5e8ec406fb
comparison
equal deleted inserted replaced
4:a4812d57ed13 5:0e01d1343c02
131 /* clean up scratch lists */ 131 /* clean up scratch lists */
132 lw_free(slist); 132 lw_free(slist);
133 lw_free(llist); 133 lw_free(llist);
134 } 134 }
135 135
136 static void lw_cmdline_help(struct lw_cmdline_parser *parser) 136 static void lw_cmdline_help(struct lw_cmdline_parser *parser, char *name)
137 { 137 {
138 printf("TODO: help\n"); 138 struct lw_cmdline_options **llist;
139 int nopt;
140 int i;
141 int t;
142 char *tstr;
143
144 tstr = parser -> doc;
145 for (nopt = 0; parser -> options[nopt].name; nopt++)
146 /* do nothing */ ;
147
148 llist = lw_alloc(sizeof(struct lw_cmdline_options *) * (nopt + 3));
149
150 for (i = 0; i < nopt; i++)
151 {
152 llist[i] = &(parser -> options[i]);
153 }
154
155 /* now sort the list */
156
157 /* now append the automatic options */
158 llist[nopt] = &(builtin[0]);
159 llist[nopt + 1] = &(builtin[1]);
160 llist[nopt + 2] = &(builtin[2]);
161
162 /* print brief usage */
163 printf("Usage: %s [OPTION...] %s\n", name, parser -> args_doc ? parser -> args_doc : "");
164 if (tstr)
165 {
166 while (*tstr && *tstr != '\v')
167 fputc(*tstr++, stdout);
168 if (*tstr)
169 tstr++;
170 }
171 fputc('\n', stdout);
172 fputc('\n', stdout);
173
174 /* display options - do it the naïve way for now */
175 for (i = 0; i < (nopt + 3); i++)
176 {
177 if (llist[i] -> key > 0x20 && llist[i] -> key < 0x7F)
178 {
179 printf(" -%c, ", llist[i] -> key);
180 }
181 else
182 {
183 printf(" ");
184 }
185
186 printf("--%s", llist[i] -> name);
187 if (llist[i] -> arg)
188 {
189 if (llist[i] -> flags & lw_cmdline_opt_optional)
190 {
191 printf("[=%s]", llist[i] -> arg);
192 }
193 else
194 {
195 printf("=%s", llist[i] -> arg);
196 }
197 }
198 if (llist[i] -> doc)
199 {
200 printf("\t\t%s", llist[i] -> doc);
201 }
202 fputc('\n', stdout);
203 }
204
205 printf("\nMandatory or optional arguments to long options are also mandatory or optional\nfor any corresponding short options.\n");
206
207 if (*tstr)
208 {
209 printf("\n%s\n", tstr);
210 }
211
212 /* clean up scratch lists */
213 lw_free(llist);
139 } 214 }
140 215
141 int lw_cmdline_parse(struct lw_cmdline_parser *parser, int argc, char **argv, unsigned flags, int *arg_index, void *input) 216 int lw_cmdline_parse(struct lw_cmdline_parser *parser, int argc, char **argv, unsigned flags, int *arg_index, void *input)
142 { 217 {
143 int i, j, r; 218 int i, j, r;
283 } 358 }
284 r = (*(parser -> parser))(lw_cmdline_key_end, NULL, input); 359 r = (*(parser -> parser))(lw_cmdline_key_end, NULL, input);
285 return r; 360 return r;
286 361
287 do_help: 362 do_help:
288 lw_cmdline_help(parser); 363 lw_cmdline_help(parser, argv[0]);
289 exit(0); 364 exit(0);
290 365
291 do_version: 366 do_version:
292 printf("%s\n", parser -> program_version); 367 printf("%s\n", parser -> program_version);
293 exit(0); 368 exit(0);