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/*
* ion/mod_query/history.h
*
* Copyright (c) Tuomo Valkonen 1999-2007.
*
* See the included file LICENSE for details.
*/
#include <string.h>
#include <ioncore/common.h>
#include <libextl/extl.h>
#include "history.h"
#define HISTORY_SIZE 1024
static int hist_head=HISTORY_SIZE;
static int hist_count=0;
static char *hist[HISTORY_SIZE];
int get_index(int i)
{
if(i<0 || i>=hist_count)
return -1;
return (hist_head+i)%HISTORY_SIZE;
}
/*EXTL_DOC
* Push an entry into line editor history.
*/
EXTL_EXPORT
bool mod_query_history_push(const char *str)
{
char *s=scopy(str);
if(s==NULL)
return FALSE;
mod_query_history_push_(s);
return TRUE;
}
void mod_query_history_push_(char *str)
{
int ndx=mod_query_history_search(str, 0, FALSE, TRUE);
if(ndx==0){
free(str);
return; /* First entry already */
}else if(ndx>0){
int i, j;
i=get_index(ndx);
free(hist[i]);
while(++ndx<hist_count){
j=get_index(ndx);
hist[i]=hist[j];
i=j;
}
hist_count--;
}
hist_head--;
if(hist_head<0)
hist_head=HISTORY_SIZE-1;
if(hist_count==HISTORY_SIZE)
free(hist[hist_head]);
else
hist_count++;
hist[hist_head]=str;
}
/*EXTL_DOC
* Get entry at index \var{n} in line editor history, 0 being the latest.
*/
EXTL_SAFE
EXTL_EXPORT
const char *mod_query_history_get(int n)
{
int i=get_index(n);
return (i<0 ? NULL : hist[i]);
}
/*EXTL_DOC
* Clear line editor history.
*/
EXTL_EXPORT
void mod_query_history_clear()
{
while(hist_count!=0){
free(hist[hist_head]);
hist_count--;
if(++hist_head==HISTORY_SIZE)
hist_head=0;
}
hist_head=HISTORY_SIZE;
}
static bool match(const char *h, const char *b, bool exact)
{
const char *h_;
if(b==NULL)
return TRUE;
/* Special case: search in any context. */
if(*b=='*' && *(b+1)==':'){
b=b+2;
h_=strchr(h, ':');
if(h_!=NULL)
h=h_+1;
}
return (exact
? strcmp(h, b)==0
: strncmp(h, b, strlen(b))==0);
}
static const char *skip_colon(const char *s)
{
const char *p=strchr(s, ':');
return (p!=NULL ? p+1 : s);
}
/*EXTL_DOC
* Try to find matching history entry. Returns -1 if none was
* found. The parameter \var{from} specifies where to start
* searching from, and \var{bwd} causes backward search from
* that point. If \var{exact} is not set, \var{s} only required
* to be a prefix of the match.
*/
EXTL_SAFE
EXTL_EXPORT
int mod_query_history_search(const char *s, int from, bool bwd, bool exact)
{
while(1){
int i=get_index(from);
if(i<0)
return -1;
if(match(hist[i], s, exact))
return from;
if(bwd)
from--;
else
from++;
}
}
uint mod_query_history_complete(const char *s, char ***h_ret)
{
char **h=ALLOC_N(char *, hist_count);
int i, n=0;
if(h==NULL)
return 0;
for(i=0; i<hist_count; i++){
int j=get_index(i);
if(j<0)
break;
if(match(hist[j], s, FALSE)){
h[n]=scopy(skip_colon(hist[j]));
if(h[n]!=NULL)
n++;
}
}
if(n==0)
free(h);
else
*h_ret=h;
return n;
}
/*EXTL_DOC
* Return table of history entries.
*/
EXTL_SAFE
EXTL_EXPORT
ExtlTab mod_query_history_table()
{
ExtlTab tab=extl_create_table();
int i;
for(i=0; i<hist_count; i++){
int j=get_index(i);
extl_table_seti_s(tab, i+1, hist[j]);
}
return tab;
}
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