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#include "toys.h"
// Humor toys.h
struct toy_context toys;
char libbuf[4096], toybuf[4096];
void show_help(void) {;}
void toy_exec(char *argv[]) {;}
// Parse config files into data structures.
struct symbol {
struct symbol *next;
int enabled;
char *name, *depends;
struct double_list *help;
} *sym;
char *keyword(char *name, char *line)
{
int len = strlen(name);
while (isspace(*line)) line++;
if (strncmp(name, line, len)) return 0;
line += len;
if (*line && !isspace(*line)) return 0;
while (isspace(*line)) line++;
return line;
}
void parse(char *filename)
{
FILE *fp = xfopen(filename, "r");
struct symbol *new = 0;
int help = 0;
for (;;) {
char *s, *line = NULL;
size_t len;
// Read line, trim whitespace at right edge.
if (getline(&line, &len, fp) < 1) break;
s = line+strlen(line);
while (--s >= line) {
if (!isspace(*s)) break;
*s = 0;
}
// source or config keyword at left edge?
if (*line && !isspace(*line)) {
help = 0;
if ((s = keyword("config", line))) {
new = xzalloc(sizeof(struct symbol));
new->next = sym;
new->name = s;
sym = new;
} else if ((s = keyword("source", line))) parse(s);
continue;
}
if (!new) continue;
if (help) dlist_add(&(new->help), line);
else if ((s = keyword("depends", line)) && (s = keyword("on", s)))
new->depends = s;
else if (keyword("help", line)) help++;
}
fclose(fp);
}
int main(int argc, char *argv[])
{
FILE *fp;
char *file;
if (argc != 3) {
fprintf(stderr, "usage: config2help Config.in .config\n");
exit(1);
}
// Read Config.in
parse(argv[1]);
// read .config
fp = xfopen(argv[2], "r");
for (;;) {
char *line = NULL;
size_t len;
if (getline(&line, &len, fp) < 1) break;
if (!strncmp("CONFIG_", line, 7)) {
struct symbol *try;
char *s = line+7;
for (try=sym; try; try=try->next) {
len = strlen(try->name);
if (!strncmp(try->name, s, len) && s[len]=='=' && s[len+1]=='y') {
try->enabled++;
break;
}
}
}
}
// Collate help according to usage, depends, and .config
// Loop through each entry, finding duplicate enabled "usage:" names
for (;;) {
struct symbol *throw = 0, *catch;
char *this, *that, *name;
int len;
// find a usage: name and collate all enabled entries with that name
for (catch = sym; catch; catch = catch->next) {
if (catch->enabled != 1) continue;
if (catch->help && (this = keyword("usage:", catch->help->data))) {
struct double_list *bang;
if (!throw) {
throw = catch;
catch->enabled++;
name = this;
while (!isspace(*this) && *this) this++;
len = (that = this)-name;
while (isspace(*that)) that++;
continue;
}
if (strncmp(name, this, len) || !isspace(this[len])) continue;
catch->enabled++;
// Suck help text out of throw into catch.
throw->enabled = 0;
// splice together circularly linked lists
bang = throw->help->prev;
throw->help->prev->next = catch->help;
throw->help->prev = catch->help->prev;
catch->help->prev->next = throw->help;
catch->help->prev = bang;
throw->help = 0;
throw = catch;
}
}
// Did we find one?
if (!throw) break;
// Collate first [-abc] option block?
// if (*s == '[' && s[1] == '-' && s[2] != '-') {
// }
}
// Print out help #defines
while (sym) {
struct double_list *dd;
if (sym->help) {
int i, padlen = 0;
char *s = xstrdup(sym->name);
for (i = 0; s[i]; i++) s[i] = tolower(s[i]);
printf("#define help_%s \"", s);
free(s);
// Measure leading whitespace of first line
dd = sym->help;
while (isspace(dd->data[padlen])) padlen++;
for (;;) {
i = padlen;
// Trim leading whitespace
s = dd->data;
while (isspace(*s) && i) {
s++;
i--;
}
for (i=0; s[i]; i++) {
if (s[i] == '"' || s[i] == '\\') putchar('\\');
putchar(s[i]);
}
putchar('\\');
putchar('n');
dd = dd->next;
if (dd == sym->help) break;
}
printf("\"\n");
}
sym = sym->next;
}
}
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