#include <stdio.h>

#include <stdio.h>
#ifdef __STDC__
# include <stdlib.h>
#endif
#include <ctype.h>
#include <string.h>

#define ML 512
#define streq(A,B) (strcmp((A),(B))==0)
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif

int indent;
int wrap_index = 78;

#ifdef __STDC__
void kilspaces(char *t)
#else
kilspaces(t)
char *t;
#endif
{
int i=0, j=0;

strcat(t," ");

while(t[i]!='\0')
{
while( t[i]!='\0' && strchr("\t\r\n ",t[i]) )
i++;
while( t[i]!='\0' && !strchr("\t\r\n ",t[i]) )
{
t[j]=t[i];
j++;
i++;
}
t[j++]=' ';
}
t[j]='\0';

return;
}

#ifdef __STDC__
void force_out(char *t)
#else
force_out(t)
char *t;
#endif
{
int i, j;

kilspaces(t);

if(t[0]=='\0')
{
putchar('\n');
return;
}

if(strlen(t)>wrap_index)
{
for(i=wrap_index-5*indent;t[i]!=' ';i--)
;
t[i++]='\0'; /* i indexes the beginning of the next string */
}
else
i=0;

if(indent)
fputs(" ",stdout);

for(j=0;t[j]!='\0';j++)
{
if(t[j]=='~')
putchar(' ');
else if(t[j]=='.' && t[j+1]==' ')
fputs(". ",stdout);
else
putchar(t[j]);
}
putchar('\n');

if(i)
strcpy(t,t+i);
else
t[0]='\0';

indent=FALSE;

return;
}

#ifdef __STDC__
void usage(void)
#else
usage()
#endif
{
puts("usage: tex2asc [-w wrap_limit]");
return;
}

#ifdef __STDC__
int main(int argc, char **argv)
#else
main(argc, argv)
int argc;
char **argv;
#endif
{
char c, cc, s[ML], t[ML];
int i, cr=0, t_index=0, chapter=1;
int control=FALSE, print_line=FALSE, center=FALSE;

while(*++argv!=NULL)
{
if((*argv)[0]!='-')
{
usage();
return 1;
}
else
while(*(++*argv)!='\0')
switch(**argv)
{
case 'w':
if(*++argv!=NULL)
{
wrap_index = atoi(*argv);
*argv+=(strlen(*argv)-1);
break;
}
default:
usage();
return 1;
}
}

indent=TRUE;
memset(t,'\0',ML-1);
while((c=getchar())!=EOF)
{
if(c=='%') /* TeX comments */
while((c=getchar())!=EOF && c!='\n')
;
if(cr && c=='\n')
{
if(t_index)
{
t[t_index]='\0';
while(t[0]!='\0')
force_out(t);
}
t_index=0;
indent=TRUE; /* paragraph beginning */
}
if(control && isspace(c))
continue;
else
control=FALSE;
if(strchr("${}",c)) /* ignore these characters: ${} */
continue;
if(c=='\n')
{
cr++;
if(print_line)
{
cr=0;
t[t_index]='\0';
kilspaces(t);
if(center && wrap_index > strlen(t))
for(i=0;i<(wrap_index-strlen(t))/2;i++)
putchar(' ');

for(i=0;t[i]!='\0';i++)
if(t[i]=='~')
putchar(' ');
else
putchar(t[i]);
putchar('\n');

t_index = 0;
indent=FALSE;
print_line = FALSE;
center = FALSE;
memset(t,'\0',ML);

continue;
}
else
c=' ';
}
else
cr=0;

if(c!='\\')
t[t_index++]=c;
else
{
control_code:
control=TRUE;
i=0;
while((c=getchar())!=EOF
&& !strchr("{}\\",c)
&& !isspace(c))
{
s[i++]=c;
if(!isalnum(c))
break;
}
s[i]='\0';
cc=c;
if(streq(s,"-") || streq(s,"\""))
; /* ignore */
else if(streq(s,"%"))
t[t_index++]='%';
else if(streq(s,"bf"))
;
else if(streq(s,"bigskip"))
{
t[t_index]='\0';
while(t[0]!='\0')
force_out(t);
putchar('\n');
t_index = 0;
}
else if(streq(s,"centerline"))
{
center++;
print_line++;
}
else if(streq(s,"chap"))
{
sprintf(t+t_index," [%d] ",chapter++);
if(chapter >= 100)
t_index+= 2;
else if(chapter >= 10)
t_index += 1;
t_index += strlen(" [1] ");
}
else if(streq(s,"dag"))
t[t_index++]='%';
else if(streq(s,"end"))
;
else if(streq(s,"hbox"))
;
else if(streq(s,"input"))
while((c=getchar())!='\n')
;
else if(streq(s,"langle"))
t[t_index++]='<';
else if(streq(s,"line"))
print_line++;
else if(streq(s,"linline"))
{
print_line++;
indent++;
}
else if(streq(s,"lline"))
print_line++;
else if(streq(s,"narrower"))
;
else if(streq(s,"noindent"))
indent=FALSE;
else if(streq(s,"poetrysize"))
wrap_index=50;
else if(streq(s,"raggedbottom"))
;
else if(streq(s,"rangle"))
t[t_index++]='>';
else if(streq(s,"sc"))
;
else if(streq(s,"sec"))
;
else if(streq(s,"vbox"))
;
else if(streq(s,"vfill"))
;
if((c=cc)=='\\')
goto control_code;
}
if( !print_line && isspace(t[t_index-1]) && t_index >
wrap_index+20 )
{
t[t_index]='\0';
force_out(t);
t_index = strlen(t);
}
}
return 0;
}