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authorGravatar Paul Fox <pgf@brightstareng.com>2005-08-04 19:04:46 +0000
committerGravatar Paul Fox <pgf@brightstareng.com>2005-08-04 19:04:46 +0000
commit3f11b1bf634536cb01d9913d1a3d10da5bf24541 (patch)
treefd76457b91cc91d8ae6091729f981acd1b321888 /shell
parent8eeb655661a0d59be478681425682543b228b5a1 (diff)
downloadbusybox-3f11b1bf634536cb01d9913d1a3d10da5bf24541.tar.gz
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commiting:
0000025: vi-editing mode for ash
Diffstat (limited to 'shell')
-rw-r--r--shell/Config.in8
-rw-r--r--shell/ash.c17
-rw-r--r--shell/cmdedit.c393
-rw-r--r--shell/cmdedit.h4
4 files changed, 388 insertions, 34 deletions
diff --git a/shell/Config.in b/shell/Config.in
index 1a3c388a4..0d39e5bae 100644
--- a/shell/Config.in
+++ b/shell/Config.in
@@ -201,6 +201,14 @@ config CONFIG_FEATURE_COMMAND_EDITING
help
Enable command editing in shell.
+config CONFIG_FEATURE_COMMAND_EDITING_VI
+ bool "vi-style line editing commands"
+ default n
+ depends on CONFIG_FEATURE_COMMAND_EDITING
+ help
+ Enable vi-style line editing in the shell. This mode can be
+ turned on and off with "set -o vi" and "set +o vi".
+
config CONFIG_FEATURE_COMMAND_HISTORY
int "history size"
default 15
diff --git a/shell/ash.c b/shell/ash.c
index 783204933..7f77594a7 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1949,19 +1949,21 @@ struct shparam {
#define bflag optlist[11]
#define uflag optlist[12]
#define qflag optlist[13]
+#define viflag optlist[14]
#ifdef DEBUG
-#define nolog optlist[14]
-#define debug optlist[15]
-#define NOPTS 16
-#else
-#define NOPTS 14
+#define nolog optlist[15]
+#define debug optlist[16]
+#endif
+
+#ifndef CONFIG_FEATURE_COMMAND_EDITING_VI
+#define setvimode(on) viflag = 0 /* forcibly keep the option off */
#endif
/* $NetBSD: options.c,v 1.33 2003/01/22 20:36:04 dsl Exp $ */
-static const char *const optletters_optnames[NOPTS] = {
+static const char *const optletters_optnames[] = {
"e" "errexit",
"f" "noglob",
"I" "ignoreeof",
@@ -1976,6 +1978,7 @@ static const char *const optletters_optnames[NOPTS] = {
"b" "notify",
"u" "nounset",
"q" "quietprofile",
+ "\0" "vi",
#ifdef DEBUG
"\0" "nolog",
"\0" "debug",
@@ -1985,6 +1988,7 @@ static const char *const optletters_optnames[NOPTS] = {
#define optletters(n) optletters_optnames[(n)][0]
#define optnames(n) (&optletters_optnames[(n)][1])
+#define NOPTS (sizeof(optletters_optnames)/sizeof(optletters_optnames[0]))
static char optlist[NOPTS];
@@ -8862,6 +8866,7 @@ optschanged(void)
#endif
setinteractive(iflag);
setjobctl(mflag);
+ setvimode(viflag);
}
static inline void
diff --git a/shell/cmdedit.c b/shell/cmdedit.c
index 3380dffe9..c67283f4a 100644
--- a/shell/cmdedit.c
+++ b/shell/cmdedit.c
@@ -441,27 +441,61 @@ static void redraw(int y, int back_cursor)
input_backward(back_cursor);
}
-/* Delete the char in front of the cursor */
-static void input_delete(void)
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+static char delbuf[BUFSIZ]; /* a place to store deleted characters */
+static char *delp = delbuf;
+static int newdelflag; /* whether delbuf should be reused yet */
+#endif
+
+/* Delete the char in front of the cursor, optionally saving it
+ * for later putback */
+static void input_delete(int save)
{
int j = cursor;
if (j == len)
return;
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+ if (save) {
+ if (newdelflag) {
+ delp = delbuf;
+ newdelflag = 0;
+ }
+ if (delp - delbuf < BUFSIZ)
+ *delp++ = command_ps[j];
+ }
+#endif
+
strcpy(command_ps + j, command_ps + j + 1);
len--;
- input_end(); /* rewtite new line */
+ input_end(); /* rewrite new line */
cmdedit_set_out_char(0); /* destroy end char */
input_backward(cursor - j); /* back to old pos cursor */
}
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+static void put(void)
+{
+ int ocursor, j = delp - delbuf;
+ if (j == 0)
+ return;
+ ocursor = cursor;
+ /* open hole and then fill it */
+ memmove(command_ps + cursor + j, command_ps + cursor, len - cursor + 1);
+ strncpy(command_ps + cursor, delbuf, j);
+ len += j;
+ input_end(); /* rewrite new line */
+ input_backward(cursor-ocursor-j+1); /* at end of new text */
+}
+#endif
+
/* Delete the char in back of the cursor */
static void input_backspace(void)
{
if (cursor > 0) {
input_backward(1);
- input_delete();
+ input_delete(0);
}
}
@@ -473,7 +507,6 @@ static void input_forward(void)
cmdedit_set_out_char(command_ps[cursor + 1]);
}
-
static void cmdedit_setwidth(int w, int redraw_flg)
{
cmdedit_termw = cmdedit_prmt_len + 2;
@@ -1217,18 +1250,147 @@ enum {
* ESC-h -- Delete forward one word
* CTL-t -- Transpose two characters
*
- * Furthermore, the "vi" command editing keys are not implemented.
+ * Minimalist vi-style command line editing available if configured.
+ * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
*
*/
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+static int vi_mode;
+
+void setvimode ( int viflag )
+{
+ vi_mode = viflag;
+}
+
+void
+vi_Word_motion(char *command, int eat)
+{
+ while (cursor < len && !isspace(command[cursor]))
+ input_forward();
+ if (eat) while (cursor < len && isspace(command[cursor]))
+ input_forward();
+}
+
+void
+vi_word_motion(char *command, int eat)
+{
+ if (isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor < len &&
+ (isalnum(command[cursor+1]) ||
+ command[cursor+1] == '_'))
+ input_forward();
+ } else if (ispunct(command[cursor])) {
+ while (cursor < len &&
+ (ispunct(command[cursor+1])))
+ input_forward();
+ }
+
+ if (cursor < len)
+ input_forward();
+
+ if (eat && cursor < len && isspace(command[cursor]))
+ while (cursor < len && isspace(command[cursor]))
+ input_forward();
+}
+
+void
+vi_End_motion(char *command)
+{
+ input_forward();
+ while (cursor < len && isspace(command[cursor]))
+ input_forward();
+ while (cursor < len-1 && !isspace(command[cursor+1]))
+ input_forward();
+}
+
+void
+vi_end_motion(char *command)
+{
+ if (cursor >= len-1)
+ return;
+ input_forward();
+ while (cursor < len-1 && isspace(command[cursor]))
+ input_forward();
+ if (cursor >= len-1)
+ return;
+ if (isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor < len-1 &&
+ (isalnum(command[cursor+1]) ||
+ command[cursor+1] == '_'))
+ input_forward();
+ } else if (ispunct(command[cursor])) {
+ while (cursor < len-1 &&
+ (ispunct(command[cursor+1])))
+ input_forward();
+ }
+}
+
+void
+vi_Back_motion(char *command)
+{
+ while (cursor > 0 && isspace(command[cursor-1]))
+ input_backward(1);
+ while (cursor > 0 && !isspace(command[cursor-1]))
+ input_backward(1);
+}
+
+void
+vi_back_motion(char *command)
+{
+ if (cursor <= 0)
+ return;
+ input_backward(1);
+ while (cursor > 0 && isspace(command[cursor]))
+ input_backward(1);
+ if (cursor <= 0)
+ return;
+ if (isalnum(command[cursor]) || command[cursor] == '_') {
+ while (cursor > 0 &&
+ (isalnum(command[cursor-1]) ||
+ command[cursor-1] == '_'))
+ input_backward(1);
+ } else if (ispunct(command[cursor])) {
+ while (cursor > 0 &&
+ (ispunct(command[cursor-1])))
+ input_backward(1);
+ }
+}
+#endif
+
+/*
+ * the normal emacs mode and vi's insert mode are the same.
+ * commands entered when in vi command mode ("escape mode") get
+ * an extra bit added to distinguish them. this lets them share
+ * much of the code in the big switch and while loop. i
+ * experimented with an ugly macro to make the case labels for
+ * these cases go away entirely when vi mode isn't configured, in
+ * hopes of letting the jump tables get smaller:
+ * #define vcase(caselabel) caselabel
+ * and then
+ * case CNTRL('A'):
+ * case vcase(VICMD('0'):)
+ * but it didn't seem to make any difference in code size,
+ * and the macro-ized code was too ugly.
+ */
+
+#define VI_cmdbit 0x100
+#define VICMD(somecmd) ((somecmd)|VI_cmdbit)
+
+/* convert uppercase ascii to equivalent control char, for readability */
+#define CNTRL(uc_char) ((uc_char) - 0x40)
+
int cmdedit_read_input(char *prompt, char command[BUFSIZ])
{
int break_out = 0;
int lastWasTab = FALSE;
- unsigned char c = 0;
-
+ unsigned char c;
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+ unsigned int ic, prevc;
+ int vi_cmdmode = 0;
+#endif
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
len = 0;
@@ -1265,22 +1427,38 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
/* if we can't read input then exit */
goto prepare_to_die;
- switch (c) {
+#ifdef CONFIG_FEATURE_COMMAND_EDITING_VI
+ newdelflag = 1;
+ ic = c;
+ if (vi_cmdmode)
+ ic |= VI_cmdbit;
+ switch (ic)
+#else
+ switch (c)
+#endif
+ {
case '\n':
case '\r':
+ case VICMD('\n'):
+ case VICMD('\r'):
/* Enter */
goto_new_line();
break_out = 1;
break;
- case 1:
+ case CNTRL('A'):
+ case VICMD('0'):
/* Control-a -- Beginning of line */
input_backward(cursor);
break;
- case 2:
+ case CNTRL('B'):
+ case VICMD('h'):
+ case VICMD('\b'):
+ case VICMD(DEL):
/* Control-b -- Move back one character */
input_backward(1);
break;
- case 3:
+ case CNTRL('C'):
+ case VICMD(CNTRL('C')):
/* Control-c -- stop gathering input */
goto_new_line();
#ifndef CONFIG_ASH
@@ -1293,7 +1471,7 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
break_out = -1; /* to control traps */
#endif
break;
- case 4:
+ case CNTRL('D'):
/* Control-d -- Delete one character, or exit
* if the len=0 and no chars to delete */
if (len == 0) {
@@ -1310,14 +1488,17 @@ prepare_to_die:
break;
#endif
} else {
- input_delete();
+ input_delete(0);
}
break;
- case 5:
+ case CNTRL('E'):
+ case VICMD('$'):
/* Control-e -- End of line */
input_end();
break;
- case 6:
+ case CNTRL('F'):
+ case VICMD('l'):
+ case VICMD(' '):
/* Control-f -- Move forward one character */
input_forward();
break;
@@ -1331,24 +1512,29 @@ prepare_to_die:
input_tab(&lastWasTab);
#endif
break;
- case 11:
+ case CNTRL('K'):
/* Control-k -- clear to end of line */
*(command + cursor) = 0;
len = cursor;
printf("\033[J");
break;
- case 12:
+ case CNTRL('L'):
+ case VICMD(CNTRL('L')):
/* Control-l -- clear screen */
printf("\033[H");
redraw(0, len-cursor);
break;
#if MAX_HISTORY >= 1
- case 14:
+ case CNTRL('N'):
+ case VICMD(CNTRL('N')):
+ case VICMD('j'):
/* Control-n -- Get next command in history */
if (get_next_history())
goto rewrite_line;
break;
- case 16:
+ case CNTRL('P'):
+ case VICMD(CNTRL('P')):
+ case VICMD('k'):
/* Control-p -- Get previous command from history */
if (cur_history > 0) {
get_previous_history();
@@ -1358,26 +1544,167 @@ prepare_to_die:
}
break;
#endif
- case 21:
+ case CNTRL('U'):
+ case VICMD(CNTRL('U')):
/* Control-U -- Clear line before cursor */
if (cursor) {
strcpy(command, command + cursor);
redraw(cmdedit_y, len -= cursor);
}
break;
- case 23:
+ case CNTRL('W'):
+ case VICMD(CNTRL('W')):
/* Control-W -- Remove the last word */
while (cursor > 0 && isspace(command[cursor-1]))
input_backspace();
while (cursor > 0 &&!isspace(command[cursor-1]))
input_backspace();
break;
+#if CONFIG_FEATURE_COMMAND_EDITING_VI
+ case VICMD('i'):
+ vi_cmdmode = 0;
+ break;
+ case VICMD('I'):
+ input_backward(cursor);
+ vi_cmdmode = 0;
+ break;
+ case VICMD('a'):
+ input_forward();
+ vi_cmdmode = 0;
+ break;
+ case VICMD('A'):
+ input_end();
+ vi_cmdmode = 0;
+ break;
+ case VICMD('x'):
+ input_delete(1);
+ break;
+ case VICMD('X'):
+ if (cursor > 0) {
+ input_backward(1);
+ input_delete(1);
+ }
+ break;
+ case VICMD('W'):
+ vi_Word_motion(command, 1);
+ break;
+ case VICMD('w'):
+ vi_word_motion(command, 1);
+ break;
+ case VICMD('E'):
+ vi_End_motion(command);
+ break;
+ case VICMD('e'):
+ vi_end_motion(command);
+ break;
+ case VICMD('B'):
+ vi_Back_motion(command);
+ break;
+ case VICMD('b'):
+ vi_back_motion(command);
+ break;
+ case VICMD('C'):
+ vi_cmdmode = 0;
+ /* fall through */
+ case VICMD('D'):
+ goto clear_to_eol;
+
+ case VICMD('c'):
+ vi_cmdmode = 0;
+ /* fall through */
+ case VICMD('d'):
+ {
+ int nc, sc;
+ sc = cursor;
+ prevc = ic;
+ if (safe_read(0, &c, 1) < 1)
+ goto prepare_to_die;
+ if (c == (prevc & 0xff)) {
+ /* "cc", "dd" */
+ input_backward(cursor);
+ goto clear_to_eol;
+ break;
+ }
+ switch(c) {
+ case 'w':
+ case 'W':
+ case 'e':
+ case 'E':
+ switch (c) {
+ case 'w': /* "dw", "cw" */
+ vi_word_motion(command, vi_cmdmode);
+ break;
+ case 'W': /* 'dW', 'cW' */
+ vi_Word_motion(command, vi_cmdmode);
+ break;
+ case 'e': /* 'de', 'ce' */
+ vi_end_motion(command);
+ input_forward();
+ break;
+ case 'E': /* 'dE', 'cE' */
+ vi_End_motion(command);
+ input_forward();
+ break;
+ }
+ nc = cursor;
+ input_backward(cursor - sc);
+ while (nc-- > cursor)
+ input_delete(1);
+ break;
+ case 'b': /* "db", "cb" */
+ case 'B': /* implemented as B */
+ if (c == 'b')
+ vi_back_motion(command);
+ else
+ vi_Back_motion(command);
+ while (sc-- > cursor)
+ input_delete(1);
+ break;
+ case ' ': /* "d ", "c " */
+ input_delete(1);
+ break;
+ case '$': /* "d$", "c$" */
+ clear_to_eol:
+ while (cursor < len)
+ input_delete(1);
+ break;
+ }
+ }
+ break;
+ case VICMD('p'):
+ input_forward();
+ /* fallthrough */
+ case VICMD('P'):
+ put();
+ break;
+ case VICMD('r'):
+ if (safe_read(0, &c, 1) < 1)
+ goto prepare_to_die;
+ if (c == 0)
+ beep();
+ else {
+ *(command + cursor) = c;
+ putchar(c);
+ putchar('\b');
+ }
+ break;
+#endif /* CONFIG_FEATURE_COMMAND_EDITING_VI */
case ESC:{
+#if CONFIG_FEATURE_COMMAND_EDITING_VI
+ if (vi_mode) {
+ /* ESC: insert mode --> command mode */
+ vi_cmdmode = 1;
+ input_backward(1);
+ break;
+ }
+#endif
/* escape sequence follows */
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
/* different vt100 emulations */
if (c == '[' || c == 'O') {
+ case VICMD('['):
+ case VICMD('O'):
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
}
@@ -1409,13 +1736,17 @@ prepare_to_die:
case 'B':
/* Down Arrow -- Get next command in history */
if (!get_next_history())
- break;
+ break;
/* Rewrite the line with the selected history item */
rewrite_line:
/* change command */
len = strlen(strcpy(command, history[cur_history]));
- /* redraw and go to end line */
+ /* redraw and go to eol (bol, in vi */
+#if CONFIG_FEATURE_COMMAND_EDITING_VI
+ redraw(cmdedit_y, vi_mode ? 9999:0);
+#else
redraw(cmdedit_y, 0);
+#endif
break;
#endif
case 'C':
@@ -1428,7 +1759,7 @@ rewrite_line:
break;
case '3':
/* Delete */
- input_delete();
+ input_delete(0);
break;
case '1':
case 'H':
@@ -1450,7 +1781,7 @@ rewrite_line:
default: /* If it's regular input, do the normal thing */
#ifdef CONFIG_FEATURE_NONPRINTABLE_INVERSE_PUT
/* Control-V -- Add non-printable symbol */
- if (c == 22) {
+ if (c == CNTRL('V')) {
if (safe_read(0, &c, 1) < 1)
goto prepare_to_die;
if (c == 0) {
@@ -1459,8 +1790,14 @@ rewrite_line:
}
} else
#endif
- if (!Isprint(c)) /* Skip non-printable characters */
- break;
+ {
+#if CONFIG_FEATURE_COMMAND_EDITING_VI
+ if (vi_cmdmode) /* don't self-insert */
+ break;
+#endif
+ if (!Isprint(c)) /* Skip non-printable characters */
+ break;
+ }
if (len >= (BUFSIZ - 2)) /* Need to leave space for enter */
break;
diff --git a/shell/cmdedit.h b/shell/cmdedit.h
index 4c0c09d76..f8482f4a7 100644
--- a/shell/cmdedit.h
+++ b/shell/cmdedit.h
@@ -12,4 +12,8 @@ void load_history ( const char *fromfile );
void save_history ( const char *tofile );
#endif
+#if CONFIG_FEATURE_COMMAND_EDITING_VI
+void setvimode ( int viflag );
+#endif
+
#endif /* CMDEDIT_H */