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/* Extract downloadable example scripts from the tex files that constitute
the Gretl User's Guide, 2020-12-06, revised 2022-08-09, revised again
2024-02-12.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
char line[1024];
char label[32];
/* max scripts per chapter, should be generous */
#define MAX_SCRIPTS 20
char *labels[MAX_SCRIPTS] = {NULL};
int nlines[MAX_SCRIPTS] = {0};
const char *destpath;
int get_chapter_label (char *label, const char *line)
{
const char *targ = "\\label{chap:";
const char *s = strstr(line, targ);
if (s != NULL) {
s += strlen(targ);
*label = '\0';
strncat(label, s, strcspn(s, "}"));
return 1;
} else {
return 0;
}
}
char *get_script_label (const char *line)
{
const char *targ = "\\scriptinfo{";
const char *s = strstr(line, targ) + strlen(targ);
int n = strcspn(s, "}");
char *label = calloc(n+1, 1);
strncat(label, s, n);
return label;
}
int process_tex_file (const char *fname)
{
char outtemp[32];
char chaplabel[32];
FILE *fp, *fs;
int n_scripts = 0;
int err = 0;
fp = fopen(fname, "r");
if (fp == NULL) {
fprintf(stderr, "%s: not found\n", fname);
return 1;
} else {
printf("\nprocessing %s\n", fname);
}
while (fgets(line, sizeof line, fp)) {
if (get_chapter_label(chaplabel, line)) {
continue;
}
if (strstr(line, "begin{script}")) {
int record = 0;
sprintf(outtemp, "script%d", n_scripts + 1);
fs = fopen(outtemp, "w");
if (fs == NULL) {
fprintf(stderr, "couldn't write to '%s'\n", outtemp);
exit(EXIT_FAILURE);
}
nlines[n_scripts] = 0;
while (fgets(line, sizeof line, fp)) {
if (strstr(line, "scriptinfo")) {
labels[n_scripts] = get_script_label(line);
record = 1;
n_scripts++;
}
if (record) {
if (strstr(line, "begin{scode}")) {
while (fgets(line, sizeof line, fp)) {
if (strstr(line, "end{scode}")) {
break;
} else {
fputs(line, fs);
nlines[n_scripts-1] += 1;
}
}
}
}
if (strstr(line, "end{script}")) {
fclose(fs);
break;
}
}
}
}
fclose(fp);
if (n_scripts > 0) {
char outname[32];
int i;
printf("Chapter ID '%s': %d script(s)\n", chaplabel, n_scripts);
for (i=0; i<n_scripts; i++) {
sprintf(outtemp, "script%d", i + 1);
printf(" %d: '%s'\n", i+1, labels[i]);
if (nlines[i] < 5) {
printf(" nlines = %d, fail\n", nlines[i]);
remove(outtemp);
err = 1;
} else {
sprintf(outname, "%s.inp", labels[i]);
rename(outtemp, outname);
}
free(labels[i]);
labels[i] = NULL;
nlines[i] = 0;
}
} else {
printf("Chapter ID '%s': no downloadable scripts\n", chaplabel);
}
return err;
}
int main (int argc, char **argv)
{
const char *texpath;
char fullname[512];
char chap[32];
FILE *fp;
int err = 0;
if (argc < 2) {
fprintf(stderr, "%s: need path to tex files\n", argv[0]);
exit(EXIT_FAILURE);
}
texpath = argv[1];
printf("tex files: '%s'\n", texpath);
destpath = getenv("DESTDIR");
sprintf(fullname, "%s/gretl-guide.tex", texpath);
fp = fopen(fullname, "rb");
if (fp == NULL) {
printf("%s: can't open '%s'\n", argv[0], fullname);
exit(EXIT_FAILURE);
}
while (fgets(line, sizeof line, fp) && !err) {
if (!strncmp(line, "\\guidechap{", 11)) {
sscanf(line + 11, "%[^}]", chap);
sprintf(fullname, "%s/%s.tex", texpath, chap);
err = process_tex_file(fullname);
}
}
fclose(fp);
if (err) {
exit(EXIT_FAILURE);
}
return 0;
}
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