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readline: Update initial readline commit -- make option configurable. Add an interface to de-couple the readline implementation from NSH. Misc. updates for coding style

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This commit is contained in:
Gregory Nutt 2015-07-28 07:17:50 -06:00
parent 264b84860d
commit 766886310d
4 changed files with 190 additions and 104 deletions
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31
include/readline.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* apps/include/readline.h
*
* Copyright (C) 2011, 2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2011, 2013, 2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -63,6 +63,35 @@ extern "C"
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: readline_prompt
*
* If a prompt string is used by the application, then the application
* must provide the prompt string to readline by calling this function.
* This is needed only for tab completion in cases where is it necessary
* to reprint the prompt string.
*
* Input Parameters:
* prompt - The prompt string.
*
* Returned values:
* None
*
* Assumptions:
* The prompt string is statically allocated a global. readline will
* simply remember the pointer to the string. The string must stay
* allocated and available. Only one prompt string is supported. If
* there are multiple clients of readline, they must all share the same
* prompt string (with exceptions in the case of the kernel build).
*
**************************************************************************/
#ifdef CONFIG_READLINE_TABCOMPLETION
void readline_prompt(FAR const *prompt);
#else
# define readline_prompt(p)
#endif
/****************************************************************************
* Name: readline
*

8
nshlib/nsh_init.c
View File

@ -1,7 +1,7 @@
/****************************************************************************
* apps/nshlib/nsh_init.c
*
* Copyright (C) 2007-2012, 2014 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2012, 2014-2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -103,4 +103,10 @@ void nsh_initialize(void)
/* Bring up the network */
(void)nsh_netinit();
#ifdef CONFIG_READLINE_TABCOMPLETION
/* Configure the NSH prompt */
readline_prompt(g_nshprompt);
#endif
}

8
system/readline/Kconfig
View File

@ -20,4 +20,12 @@ config READLINE_ECHO
already has local echo support or you need to suppress the back-channel
responses for any other reason.
config READLINE_TABCOMPLETION
bool "Tab completion"
default n
depends on BUILD_FLAT && BUILTIN
---help---
Build in support for Unix-style tab completion. This feature was
provided by Nghia.
endif

247
system/readline/readline_common.c
View File

@ -48,27 +48,11 @@
#include <nuttx/ascii.h>
#include <nuttx/vt100.h>
#include <nuttx/binfmt/builtin.h>
#include <apps/readline.h>
#include "readline.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
extern const char g_nshprompt[];
/****************************************************************************
* Private Data
****************************************************************************/
@ -76,18 +60,155 @@ extern const char g_nshprompt[];
static const char g_erasetoeol[] = VT100_CLEAREOL;
#ifdef CONFIG_READLINE_TABCOMPLETION
/* Prompt string to present at the beginning of the line */
static const *char g_readline_prompt = NULL;
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
static void tab_completion(FAR struct rl_common_s *vtbl, char *buf, int *len);
/****************************************************************************
* Name: tab_completion
*
* Description:
* Nghia - Unix like tab completion, only for builtin apps
*
* Input Parameters:
* vtbl - vtbl used to access implementation specific interface
* buf - The user allocated buffer to be filled.
* buflen - the size of the buffer.
*
* Returned Value:
* None.
*
**************************************************************************/
#ifdef CONFIG_READLINE_TABCOMPLETION
void tab_completion(FAR struct rl_common_s *vtbl, char *buf, int *nch)
{
FAR const char *name = NULL;
int num_matches = 0;
int matches[128];
int len = *nch;
int i;
int j;
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 */
if (g_readline_prompt != NULL)
{
for (i = 0; i < strlen(g_readline_prompt); i++)
{
RL_PUTC(vtbl, g_readline_prompt[i]);
}
}
for (i = 0; i < len; i++)
{
RL_PUTC(vtbl, buf[i]);
}
}
}
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: readline_prompt
*
* If a prompt string is used by the application, then the application
* must provide the prompt string to readline by calling this function.
* This is needed only for tab completion in cases where is it necessary
* to reprint the prompt string.
*
* Input Parameters:
* prompt - The prompt string.
*
* Returned values:
* None
*
* Assumptions:
* The prompt string is statically allocated a global. readline will
* simply remember the pointer to the string. The string must stay
* allocated and available. Only one prompt string is supported. If
* there are multiple clients of readline, they must all share the same
* prompt string (with exceptions in the case of the kernel build).
*
**************************************************************************/
#ifdef CONFIG_READLINE_TABCOMPLETION
void readline_prompt(FAR const *prompt)
{
g_readline_prompt = prompt;
}
#endif
/****************************************************************************
* Name: readline_common
*
* Description:
* readline() reads in at most one less than 'buflen' characters from
* 'instream' and stores them into the buffer pointed to by 'buf'.
* Characters are echoed on 'outstream'. Reading stops after an EOF or a
@ -102,12 +223,11 @@ static void tab_completion(FAR struct rl_common_s *vtbl, char *buf, int *len);
* different creature.
*
* Input Parameters:
* buf - The user allocated buffer to be filled.
* buflen - the size of the buffer.
* instream - The stream to read characters from
* outstream - The stream to each characters to.
* vtbl - vtbl used to access implementation specific interface
* buf - The user allocated buffer to be filled.
* buflen - the size of the buffer.
*
* Returned values:
* Returned Value:
* On success, the (positive) number of bytes transferred is returned.
* EOF is returned to indicate either an end of file condition or a
* failure.
@ -285,88 +405,11 @@ ssize_t readline_common(FAR struct rl_common_s *vtbl, FAR char *buf, int buflen)
return nch;
}
}
#ifdef CONFIG_READLINE_TABCOMPLETION
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]);
}
}
#endif
}
}