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Unix style TAB compleition, for builtin apps only

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This commit is contained in:
Nghia Ho 2015-07-27 22:47:24 -07:00
parent ae2e61c764
commit bc1c74387f
1 changed files with 84 additions and 0 deletions
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84
system/readline/readline_common.c
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@ -67,6 +67,7 @@
/****************************************************************************
* Public Data
****************************************************************************/
extern const char g_nshprompt[];
/****************************************************************************
* Private Data
@ -78,6 +79,7 @@ static const char g_erasetoeol[] = VT100_CLEAREOL;
/****************************************************************************
* Private Functions
****************************************************************************/
static void tab_completion(FAR struct rl_common_s *vtbl, char *buf, int *len);
/****************************************************************************
* Public Functions
@ -283,6 +285,88 @@ ssize_t readline_common(FAR struct rl_common_s *vtbl, FAR char *buf, int buflen)
return nch;
}
}
else if (ch == '\t') /* Nghia - TAB character */
{
tab_completion(vtbl, buf, &nch);
}
}
}
/*
* Nghia - Unix like tab completion, only for builtin apps
*/
void tab_completion(FAR struct rl_common_s *vtbl, char *buf, int *nch)
{
int i, j;
int num_matches = 0;
int matches[128];
FAR const char *name = NULL;
int len = *nch;
if (len >= 1)
{
for (i = 0; (name = builtin_getname(i)) != NULL; i++)
{
if (!strncmp(buf, name, len))
{
matches[num_matches] = i;
num_matches++;
if (num_matches >= sizeof(matches) / sizeof(int))
{
break;
}
}
}
if (num_matches == 1)
{
name = builtin_getname(matches[0]);
int name_len = strlen(name);
for (j = len; j < name_len; j++)
{
buf[j] = name[j];
RL_PUTC(vtbl, name[j]);
}
// don't remove extra characters after the completed word, if any
if (len < name_len)
{
*nch = name_len;
}
}
else if (num_matches > 1)
{
RL_PUTC(vtbl, '\n');
// possible completion
for (i = 0; i < num_matches; i++)
{
name = builtin_getname(matches[i]);
RL_PUTC(vtbl, ' ');
RL_PUTC(vtbl, ' ');
for (j = 0; j < strlen(name); j++)
{
RL_PUTC(vtbl, name[j]);
}
RL_PUTC(vtbl, '\n');
}
// output the original prompt
for (i = 0; i < strlen(g_nshprompt); i++)
{
RL_PUTC(vtbl, g_nshprompt[i]);
}
for (i = 0; i < len; i++)
{
RL_PUTC(vtbl, buf[i]);
}
}
}
}