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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFSIZE 1024
#define MAX_COMMANDSIZE 4096
static void addc(char, int);
static void blank(size_t);
static void dotemplate();
static void shtpl(FILE*);
enum states {
TEXT = 0,
BEGIN_T,
IN_T,
END_T
};
char cmd[MAX_COMMANDSIZE];
int
main(int argc, char **argv)
{
FILE *f;
int i;
if (argc == 1)
shtpl(stdin);
else {
for (i = 1; i < argc; i++) {
f = fopen(argv[i], "r");
if (f == NULL) {
fprintf(stderr, "Error opening %s\n", argv[i]);
continue;
}
shtpl(f);
fclose(f);
}
}
return 0;
}
static void
addc(char c, int pos)
{
if (pos + 2 >= MAX_COMMANDSIZE) {
fprintf(stderr, "Command too long %s\n", cmd);
exit(1);
}
cmd[pos] = c;
}
static void
blank(size_t size)
{
memset(cmd, 0, size);
}
static void
dotemplate()
{
char c1, c2;
FILE *pipe;
pipe = popen(cmd, "r");
c1 = getc(pipe);
while ((c2 = getc(pipe)) != EOF) {
printf("%c", c1);
c1 = c2;
}
if (c1 != '\n')
printf("%c", c1);
pclose(pipe);
}
static void
shtpl(FILE *f)
{
char c;
char buf[BUFSIZE];
size_t i;
enum states state;
int pos;
blank(MAX_COMMANDSIZE);
state = TEXT;
pos = 0;
while (fgets(buf, BUFSIZE, f)) {
for (i = 0, c = buf[i]; i < BUFSIZE && c != '\0'; i++, c = buf[i] )
switch (state) {
case TEXT:
if (c == '{')
state = BEGIN_T;
else
printf("%c", c);
break;
case BEGIN_T:
if (c == '{')
state = IN_T;
else {
state = TEXT;
printf("{%c", c);
}
break;
case END_T:
if (c == '}') {
state = TEXT;
addc('\0', pos);
dotemplate();
blank(MAX_COMMANDSIZE);
pos = 0;
} else {
state = IN_T;
addc('}', pos++);
addc(c, pos++);
}
break;
case IN_T:
if (c == '}')
state = END_T;
else
addc(c, pos++);
break;
default:
assert(0 && "Unknown state");
}
}
}
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