/**
* Show help information based on myoption->help values
* @param oindex (i) - if non-negative, show only help by myoption[oindex].help
* @param options (i) - array of `myoption`
*
* @exit: run `exit(-1)` !!!
*/
void showhelp(int oindex, myoption *options){
// ATTENTION: string `help` prints through macro PRNT(), by default it is gettext,
// but you can redefine it before `#include "parceargs.h"`
int max_opt_len = 0; // max len of options substring - for right indentation
const int bufsz = 255;
char buf[bufsz+1];
myoption *opts = options;
assert(opts);
assert(opts[0].name); // check whether there is at least one options
if(oindex > -1){ // print only one message
opts = &options[oindex];
printf(" ");
if(!opts->flag && isalpha(opts->val)) printf("-%c, ", opts->val);
printf("--%s", opts->name);
if(opts->has_arg == 1) printf("=arg");
else if(opts->has_arg == 2) printf("[=arg]");
printf(" %s\n", PRNT(opts->help));
exit(-1);
}
// header, by default is just "progname\n"
printf("\n");
if(strstr(helpstring, "%s")) // print progname
printf(helpstring, __progname);
else // only text
printf("%s", helpstring);
printf("\n");
// count max_opt_len
do{
int L = strlen(opts->name);
if(max_opt_len < L) max_opt_len = L;
}while((++opts)->name);
max_opt_len += 14; // format: '-S , --long[=arg]' - get addition 13 symbols
opts = options;
// Now print all help
do{
int p = sprintf(buf, " "); // a little indent
if(!opts->flag && isalpha(opts->val)) // .val is short argument
p += snprintf(buf+p, bufsz-p, "-%c, ", opts->val);
p += snprintf(buf+p, bufsz-p, "--%s", opts->name);
if(opts->has_arg == 1) // required argument
p += snprintf(buf+p, bufsz-p, "=arg");
else if(opts->has_arg == 2) // optional argument
p += snprintf(buf+p, bufsz-p, "[=arg]");
assert(p < max_opt_len); // there would be magic if p >= max_opt_len
printf("%-*s%s\n", max_opt_len+1, buf, PRNT(opts->help)); // write options & at least 2 spaces after
}while((++opts)->name);
printf("\n\n");
exit(-1);
}
void printTri(const double *A, const int n, const char *nm) {
int c, r, i, sl= strlen(nm);
PRNT("%s= [", nm);
for(r= 0; r<n; r++) {
for(c= 0; c<n; c++) {
if(r>c) {
i= (r*(r+1))/2 + c;
} else {
i= (c*(c+1))/2 + r;
}
PRNT("%g", A[i]);
if(c<(n-1)) {
PRNT(", ");
} else {
if(r<(n-1)) {
PRNT("\n ");
for(i= 0; i<sl; i++) PRNT(" ");
} else {
PRNT("]\n");
}
}
}
}
}
void printVec(const double *A, const int n, const char *nm) {
int i, nc, ns= 255-20;
char s[256], *ps;
ps= &s[0];
nc= sprintf(ps, "%s= [%g", nm, A[0]);
ns-= nc;
ps+= nc;
for(i= 1; i<n && ns>0; i++) {
nc= sprintf(ps, ", %g", A[i]);
ns-= nc;
ps+= nc;
}
if(ns>0) sprintf(ps, "]");
PRNT("%s\n",s);
}
void printMat(const double *A, const int n, const int m, const char *nm) {
int c, r, i, sl= strlen(nm);;
PRNT("%s= [", nm);
for(r= 0; r<n; r++) {
for(c= 0; c<m; c++) {
PRNT("%g", A[r + n*c]);
if(c<(m-1)) {
PRNT(", ");
} else {
if(r<(n-1)) {
PRNT("\n ");
for(i= 0; i<sl; i++) PRNT(" ");
} else {
PRNT("]\n");
}
}
}
}
}