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1 227 jeremybenn
.\"
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.\" MAN PAGE COMMENTS to
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.\"
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.\"     Chet Ramey
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.\"     Information Network Services
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.\"     Case Western Reserve University
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.\"     chet@ins.CWRU.Edu
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.\"
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.\"     Last Change: Thu Jul 31 08:46:08 EDT 2003
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.\"
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.TH HISTORY 3 "2003 July 31" "GNU History 5.0"
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.\"
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.\" File Name macro.  This used to be `.PN', for Path Name,
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.\" but Sun doesn't seem to like that very much.
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.\"
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.de FN
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\fI\|\\$1\|\fP
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..
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.ds lp \fR\|(\fP
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.ds rp \fR\|)\fP
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.\" FnN return-value fun-name N arguments
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.de Fn1
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\fI\\$1\fP \fB\\$2\fP \\*(lp\fI\\$3\fP\\*(rp
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.br
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..
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.de Fn2
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.if t \fI\\$1\fP \fB\\$2\fP \\*(lp\fI\\$3,\|\\$4\fP\\*(rp
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.if n \fI\\$1\fP \fB\\$2\fP \\*(lp\fI\\$3, \\$4\fP\\*(rp
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.br
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..
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.de Fn3
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.if t \fI\\$1\fP \fB\\$2\fP \\*(lp\fI\\$3,\|\\$4,\|\\$5\fP\|\\*(rp
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.if n \fI\\$1\fP \fB\\$2\fP \\*(lp\fI\\$3, \\$4, \\$5\fP\\*(rp
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.br
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..
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.de Vb
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\fI\\$1\fP \fB\\$2\fP
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.br
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..
40
.SH NAME
41
history \- GNU History Library
42
.SH COPYRIGHT
43
.if t The GNU History Library is Copyright \(co 1989-2002 by the Free Software Foundation, Inc.
44
.if n The GNU History Library is Copyright (C) 1989-2002 by the Free Software Foundation, Inc.
45
.SH DESCRIPTION
46
Many programs read input from the user a line at a time.  The GNU
47
History library is able to keep track of those lines, associate arbitrary
48
data with each line, and utilize information from previous lines in
49
composing new ones.
50
.PP
51
.SH "HISTORY EXPANSION"
52
.PP
53
The history library supports a history expansion feature that
54
is identical to the history expansion in
55
.BR bash.
56
This section describes what syntax features are available.
57
.PP
58
History expansions introduce words from the history list into
59
the input stream, making it easy to repeat commands, insert the
60
arguments to a previous command into the current input line, or
61
fix errors in previous commands quickly.
62
.PP
63
History expansion is usually performed immediately after a complete line
64
is read.
65
It takes place in two parts.
66
The first is to determine which line from the history list
67
to use during substitution.
68
The second is to select portions of that line for inclusion into
69
the current one.
70
The line selected from the history is the \fIevent\fP,
71
and the portions of that line that are acted upon are \fIwords\fP.
72
Various \fImodifiers\fP are available to manipulate the selected words.
73
The line is broken into words in the same fashion as \fBbash\fP
74
does when reading input,
75
so that several words that would otherwise be separated
76
are considered one word when surrounded by quotes (see the
77
description of \fBhistory_tokenize()\fP below).
78
History expansions are introduced by the appearance of the
79
history expansion character, which is \^\fB!\fP\^ by default.
80
Only backslash (\^\fB\e\fP\^) and single quotes can quote
81
the history expansion character.
82
.SS Event Designators
83
.PP
84
An event designator is a reference to a command line entry in the
85
history list.
86
.PP
87
.PD 0
88
.TP
89
.B !
90
Start a history substitution, except when followed by a
91
.BR blank ,
92
newline, = or (.
93
.TP
94
.B !\fIn\fR
95
Refer to command line
96
.IR n .
97
.TP
98
.B !\-\fIn\fR
99
Refer to the current command line minus
100
.IR n .
101
.TP
102
.B !!
103
Refer to the previous command.  This is a synonym for `!\-1'.
104
.TP
105
.B !\fIstring\fR
106
Refer to the most recent command starting with
107
.IR string .
108
.TP
109
.B !?\fIstring\fR\fB[?]\fR
110
Refer to the most recent command containing
111
.IR string .
112
The trailing \fB?\fP may be omitted if
113
.I string
114
is followed immediately by a newline.
115
.TP
116
.B \d\s+2^\s-2\u\fIstring1\fP\d\s+2^\s-2\u\fIstring2\fP\d\s+2^\s-2\u
117
Quick substitution.  Repeat the last command, replacing
118
.I string1
119
with
120
.IR string2 .
121
Equivalent to
122
``!!:s/\fIstring1\fP/\fIstring2\fP/''
123
(see \fBModifiers\fP below).
124
.TP
125
.B !#
126
The entire command line typed so far.
127
.PD
128
.SS Word Designators
129
.PP
130
Word designators are used to select desired words from the event.
131
A
132
.B :
133
separates the event specification from the word designator.
134
It may be omitted if the word designator begins with a
135
.BR ^ ,
136
.BR $ ,
137
.BR * ,
138
.BR \- ,
139
or
140
.BR % .
141
Words are numbered from the beginning of the line,
142
with the first word being denoted by 0 (zero).
143
Words are inserted into the current line separated by single spaces.
144
.PP
145
.PD 0
146
.TP
147
.B 0 (zero)
148
The zeroth word.  For the shell, this is the command
149
word.
150
.TP
151
.I n
152
The \fIn\fRth word.
153
.TP
154
.B ^
155
The first argument.  That is, word 1.
156
.TP
157
.B $
158
The last argument.
159
.TP
160
.B %
161
The word matched by the most recent `?\fIstring\fR?' search.
162
.TP
163
.I x\fB\-\fPy
164
A range of words; `\-\fIy\fR' abbreviates `0\-\fIy\fR'.
165
.TP
166
.B *
167
All of the words but the zeroth.  This is a synonym
168
for `\fI1\-$\fP'.  It is not an error to use
169
.B *
170
if there is just one
171
word in the event; the empty string is returned in that case.
172
.TP
173
.B x*
174
Abbreviates \fIx\-$\fP.
175
.TP
176
.B x\-
177
Abbreviates \fIx\-$\fP like \fBx*\fP, but omits the last word.
178
.PD
179
.PP
180
If a word designator is supplied without an event specification, the
181
previous command is used as the event.
182
.SS Modifiers
183
.PP
184
After the optional word designator, there may appear a sequence of
185
one or more of the following modifiers, each preceded by a `:'.
186
.PP
187
.PD 0
188
.PP
189
.TP
190
.B h
191
Remove a trailing file name component, leaving only the head.
192
.TP
193
.B t
194
Remove all leading file name components, leaving the tail.
195
.TP
196
.B r
197
Remove a trailing suffix of the form \fI.xxx\fP, leaving the
198
basename.
199
.TP
200
.B e
201
Remove all but the trailing suffix.
202
.TP
203
.B p
204
Print the new command but do not execute it.
205
.TP
206
.B q
207
Quote the substituted words, escaping further substitutions.
208
.TP
209
.B x
210
Quote the substituted words as with
211
.BR q ,
212
but break into words at
213
.B blanks
214
and newlines.
215
.TP
216
.B s/\fIold\fP/\fInew\fP/
217
Substitute
218
.I new
219
for the first occurrence of
220
.I old
221
in the event line.  Any delimiter can be used in place of /.  The
222
final delimiter is optional if it is the last character of the
223
event line.  The delimiter may be quoted in
224
.I old
225
and
226
.I new
227
with a single backslash.  If & appears in
228
.IR new ,
229
it is replaced by
230
.IR old .
231
A single backslash will quote the &.  If
232
.I old
233
is null, it is set to the last
234
.I old
235
substituted, or, if no previous history substitutions took place,
236
the last
237
.I string
238
in a
239
.B !?\fIstring\fR\fB[?]\fR
240
search.
241
.TP
242
.B &
243
Repeat the previous substitution.
244
.TP
245
.B g
246
Cause changes to be applied over the entire event line.  This is
247
used in conjunction with `\fB:s\fP' (e.g., `\fB:gs/\fIold\fP/\fInew\fP/\fR')
248
or `\fB:&\fP'.  If used with
249
`\fB:s\fP', any delimiter can be used
250
in place of /, and the final delimiter is optional
251
if it is the last character of the event line.
252
An \fBa\fP may be used as a synonym for \fBg\fP.
253
.TP
254
.B G
255
Apply the following `\fBs\fP' modifier once to each word in the event line.
256
.PD
257
.SH "PROGRAMMING WITH HISTORY FUNCTIONS"
258
This section describes how to use the History library in other programs.
259
.SS Introduction to History
260
.PP
261
The programmer using the History library has available functions
262
for remembering lines on a history list, associating arbitrary data
263
with a line, removing lines from the list, searching through the list
264
for a line containing an arbitrary text string, and referencing any line
265
in the list directly.  In addition, a history \fIexpansion\fP function
266
is available which provides for a consistent user interface across
267
different programs.
268
.PP
269
The user using programs written with the History library has the
270
benefit of a consistent user interface with a set of well-known
271
commands for manipulating the text of previous lines and using that text
272
in new commands.  The basic history manipulation commands are
273
identical to
274
the history substitution provided by \fBbash\fP.
275
.PP
276
If the programmer desires, he can use the Readline library, which
277
includes some history manipulation by default, and has the added
278
advantage of command line editing.
279
.PP
280
Before declaring any functions using any functionality the History
281
library provides in other code, an application writer should include
282
the file
283
.FN 
284
in any file that uses the
285
History library's features.  It supplies extern declarations for all
286
of the library's public functions and variables, and declares all of
287
the public data structures.
288
 
289
.SS History Storage
290
.PP
291
The history list is an array of history entries.  A history entry is
292
declared as follows:
293
.PP
294
.Vb "typedef void *" histdata_t;
295
.PP
296
.nf
297
typedef struct _hist_entry {
298
  char *line;
299
  char *timestamp;
300
  histdata_t data;
301
} HIST_ENTRY;
302
.fi
303
.PP
304
The history list itself might therefore be declared as
305
.PP
306
.Vb "HIST_ENTRY **" the_history_list;
307
.PP
308
The state of the History library is encapsulated into a single structure:
309
.PP
310
.nf
311
/*
312
 * A structure used to pass around the current state of the history.
313
 */
314
typedef struct _hist_state {
315
  HIST_ENTRY **entries; /* Pointer to the entries themselves. */
316
  int offset;           /* The location pointer within this array. */
317
  int length;           /* Number of elements within this array. */
318
  int size;             /* Number of slots allocated to this array. */
319
  int flags;
320
} HISTORY_STATE;
321
.fi
322
.PP
323
If the flags member includes \fBHS_STIFLED\fP, the history has been
324
stifled.
325
.SH "History Functions"
326
.PP
327
This section describes the calling sequence for the various functions
328
exported by the GNU History library.
329
.SS Initializing History and State Management
330
This section describes functions used to initialize and manage
331
the state of the History library when you want to use the history
332
functions in your program.
333
 
334
.Fn1 void using_history void
335
Begin a session in which the history functions might be used.  This
336
initializes the interactive variables.
337
 
338
.Fn1 "HISTORY_STATE *" history_get_history_state void
339
Return a structure describing the current state of the input history.
340
 
341
.Fn1 void history_set_history_state "HISTORY_STATE *state"
342
Set the state of the history list according to \fIstate\fP.
343
 
344
.SS History List Management
345
 
346
These functions manage individual entries on the history list, or set
347
parameters managing the list itself.
348
 
349
.Fn1 void add_history "const char *string"
350
Place \fIstring\fP at the end of the history list.  The associated data
351
field (if any) is set to \fBNULL\fP.
352
 
353
.Fn1 void add_history_time "const char *string"
354
Change the time stamp associated with the most recent history entry to
355
\fIstring\fP.
356
 
357
.Fn1 "HIST_ENTRY *" remove_history "int which"
358
Remove history entry at offset \fIwhich\fP from the history.  The
359
removed element is returned so you can free the line, data,
360
and containing structure.
361
 
362
.Fn1 "histdata_t" free_history_entry "HIST_ENTRY *histent"
363
Free the history entry \fIhistent\fP and any history library private
364
data associated with it.  Returns the application-specific data
365
so the caller can dispose of it.
366
 
367
.Fn3 "HIST_ENTRY *" replace_history_entry "int which" "const char *line" "histdata_t data"
368
Make the history entry at offset \fIwhich\fP have \fIline\fP and \fIdata\fP.
369
This returns the old entry so the caller can dispose of any
370
application-specific data.  In the case
371
of an invalid \fIwhich\fP, a \fBNULL\fP pointer is returned.
372
 
373
.Fn1 void clear_history "void"
374
Clear the history list by deleting all the entries.
375
 
376
.Fn1 void stifle_history "int max"
377
Stifle the history list, remembering only the last \fImax\fP entries.
378
 
379
.Fn1 int unstifle_history "void"
380
Stop stifling the history.  This returns the previously-set
381
maximum number of history entries (as set by \fBstifle_history()\fP).
382
history was stifled.  The value is positive if the history was
383
stifled, negative if it wasn't.
384
 
385
.Fn1 int history_is_stifled "void"
386
Returns non-zero if the history is stifled, zero if it is not.
387
 
388
.SS Information About the History List
389
 
390
These functions return information about the entire history list or
391
individual list entries.
392
 
393
.Fn1 "HIST_ENTRY **" history_list "void"
394
Return a \fBNULL\fP terminated array of \fIHIST_ENTRY *\fP which is the
395
current input history.  Element 0 of this list is the beginning of time.
396
If there is no history, return \fBNULL\fP.
397
 
398
.Fn1 int where_history "void"
399
Returns the offset of the current history element.
400
 
401
.Fn1 "HIST_ENTRY *" current_history "void"
402
Return the history entry at the current position, as determined by
403
\fBwhere_history()\fP.  If there is no entry there, return a \fBNULL\fP
404
pointer.
405
 
406
.Fn1 "HIST_ENTRY *" history_get "int offset"
407
Return the history entry at position \fIoffset\fP, starting from
408
\fBhistory_base\fP.
409
If there is no entry there, or if \fIoffset\fP
410
is greater than the history length, return a \fBNULL\fP pointer.
411
 
412
.Fn1 "time_t" history_get_time "HIST_ENTRY *"
413
Return the time stamp associated with the history entry passed as the argument.
414
 
415
.Fn1 int history_total_bytes "void"
416
Return the number of bytes that the primary history entries are using.
417
This function returns the sum of the lengths of all the lines in the
418
history.
419
 
420
.SS Moving Around the History List
421
 
422
These functions allow the current index into the history list to be
423
set or changed.
424
 
425
.Fn1 int history_set_pos "int pos"
426
Set the current history offset to \fIpos\fP, an absolute index
427
into the list.
428
Returns 1 on success, 0 if \fIpos\fP is less than zero or greater
429
than the number of history entries.
430
 
431
.Fn1 "HIST_ENTRY *" previous_history "void"
432
Back up the current history offset to the previous history entry, and
433
return a pointer to that entry.  If there is no previous entry, return
434
a \fBNULL\fP pointer.
435
 
436
.Fn1 "HIST_ENTRY *" next_history "void"
437
Move the current history offset forward to the next history entry, and
438
return the a pointer to that entry.  If there is no next entry, return
439
a \fBNULL\fP pointer.
440
 
441
.SS Searching the History List
442
 
443
These functions allow searching of the history list for entries containing
444
a specific string.  Searching may be performed both forward and backward
445
from the current history position.  The search may be \fIanchored\fP,
446
meaning that the string must match at the beginning of the history entry.
447
 
448
.Fn2 int history_search "const char *string" "int direction"
449
Search the history for \fIstring\fP, starting at the current history offset.
450
If \fIdirection\fP is less than 0, then the search is through
451
previous entries, otherwise through subsequent entries.
452
If \fIstring\fP is found, then
453
the current history index is set to that history entry, and the value
454
returned is the offset in the line of the entry where
455
\fIstring\fP was found.  Otherwise, nothing is changed, and a -1 is
456
returned.
457
 
458
.Fn2 int history_search_prefix "const char *string" "int direction"
459
Search the history for \fIstring\fP, starting at the current history
460
offset.  The search is anchored: matching lines must begin with
461
\fIstring\fP.  If \fIdirection\fP is less than 0, then the search is
462
through previous entries, otherwise through subsequent entries.
463
If \fIstring\fP is found, then the
464
current history index is set to that entry, and the return value is 0.
465
Otherwise, nothing is changed, and a -1 is returned.
466
 
467
.Fn3 int history_search_pos "const char *string" "int direction" "int pos"
468
Search for \fIstring\fP in the history list, starting at \fIpos\fP, an
469
absolute index into the list.  If \fIdirection\fP is negative, the search
470
proceeds backward from \fIpos\fP, otherwise forward.  Returns the absolute
471
index of the history element where \fIstring\fP was found, or -1 otherwise.
472
 
473
.SS Managing the History File
474
The History library can read the history from and write it to a file.
475
This section documents the functions for managing a history file.
476
 
477
.Fn1 int read_history "const char *filename"
478
Add the contents of \fIfilename\fP to the history list, a line at a time.
479
If \fIfilename\fP is \fBNULL\fP, then read from \fI~/.history\fP.
480
Returns 0 if successful, or \fBerrno\fP if not.
481
 
482
.Fn3 int read_history_range "const char *filename" "int from" "int to"
483
Read a range of lines from \fIfilename\fP, adding them to the history list.
484
Start reading at line \fIfrom\fP and end at \fIto\fP.
485
If \fIfrom\fP is zero, start at the beginning.  If \fIto\fP is less than
486
\fIfrom\fP, then read until the end of the file.  If \fIfilename\fP is
487
\fBNULL\fP, then read from \fI~/.history\fP.  Returns 0 if successful,
488
or \fBerrno\fP if not.
489
 
490
.Fn1 int write_history "const char *filename"
491
Write the current history to \fIfilename\fP, overwriting \fIfilename\fP
492
if necessary.
493
If \fIfilename\fP is \fBNULL\fP, then write the history list to \fI~/.history\fP.
494
Returns 0 on success, or \fBerrno\fP on a read or write error.
495
 
496
 
497
.Fn2 int append_history "int nelements" "const char *filename"
498
Append the last \fInelements\fP of the history list to \fIfilename\fP.
499
If \fIfilename\fP is \fBNULL\fP, then append to \fI~/.history\fP.
500
Returns 0 on success, or \fBerrno\fP on a read or write error.
501
 
502
.Fn2 int history_truncate_file "const char *filename" "int nlines"
503
Truncate the history file \fIfilename\fP, leaving only the last
504
\fInlines\fP lines.
505
If \fIfilename\fP is \fBNULL\fP, then \fI~/.history\fP is truncated.
506
Returns 0 on success, or \fBerrno\fP on failure.
507
 
508
.SS History Expansion
509
 
510
These functions implement history expansion.
511
 
512
.Fn2 int history_expand "char *string" "char **output"
513
Expand \fIstring\fP, placing the result into \fIoutput\fP, a pointer
514
to a string.  Returns:
515
.RS
516
.PD 0
517
.TP
518
 
519
If no expansions took place (or, if the only change in
520
the text was the removal of escape characters preceding the history expansion
521
character);
522
.TP
523
1
524
if expansions did take place;
525
.TP
526
-1
527
if there was an error in expansion;
528
.TP
529
2
530
if the returned line should be displayed, but not executed,
531
as with the \fB:p\fP modifier.
532
.PD
533
.RE
534
If an error ocurred in expansion, then \fIoutput\fP contains a descriptive
535
error message.
536
 
537
.Fn3 "char *" get_history_event "const char *string" "int *cindex" "int qchar"
538
Returns the text of the history event beginning at \fIstring\fP +
539
\fI*cindex\fP.  \fI*cindex\fP is modified to point to after the event
540
specifier.  At function entry, \fIcindex\fP points to the index into
541
\fIstring\fP where the history event specification begins.  \fIqchar\fP
542
is a character that is allowed to end the event specification in addition
543
to the ``normal'' terminating characters.
544
 
545
.Fn1 "char **" history_tokenize "const char *string"
546
Return an array of tokens parsed out of \fIstring\fP, much as the
547
shell might.
548
The tokens are split on the characters in the
549
\fBhistory_word_delimiters\fP variable,
550
and shell quoting conventions are obeyed.
551
 
552
.Fn3 "char *" history_arg_extract "int first" "int last" "const char *string"
553
Extract a string segment consisting of the \fIfirst\fP through \fIlast\fP
554
arguments present in \fIstring\fP.  Arguments are split using
555
\fBhistory_tokenize()\fP.
556
 
557
.SS History Variables
558
 
559
This section describes the externally-visible variables exported by
560
the GNU History Library.
561
 
562
.Vb int history_base
563
The logical offset of the first entry in the history list.
564
 
565
.Vb int history_length
566
The number of entries currently stored in the history list.
567
 
568
.Vb int history_max_entries
569
The maximum number of history entries.  This must be changed using
570
\fBstifle_history()\fP.
571
 
572
.Vb int history_write_timestamps
573
If non-zero, timestamps are written to the history file, so they can be
574
preserved between sessions.  The default value is 0, meaning that
575
timestamps are not saved.
576
 
577
.Vb char history_expansion_char
578
The character that introduces a history event.  The default is \fB!\fP.
579
Setting this to 0 inhibits history expansion.
580
 
581
.Vb char history_subst_char
582
The character that invokes word substitution if found at the start of
583
a line.  The default is \fB^\fP.
584
 
585
.Vb char history_comment_char
586
During tokenization, if this character is seen as the first character
587
of a word, then it and all subsequent characters up to a newline are
588
ignored, suppressing history expansion for the remainder of the line.
589
This is disabled by default.
590
 
591
.Vb "char *" history_word_delimiters
592
The characters that separate tokens for \fBhistory_tokenize()\fP.
593
The default value is \fB"\ \et\en()<>;&|"\fP.
594
 
595
.Vb "char *" history_no_expand_chars
596
The list of characters which inhibit history expansion if found immediately
597
following \fBhistory_expansion_char\fP.  The default is space, tab, newline,
598
\fB\er\fP, and \fB=\fP.
599
 
600
.Vb "char *" history_search_delimiter_chars
601
The list of additional characters which can delimit a history search
602
string, in addition to space, tab, \fI:\fP and \fI?\fP in the case of
603
a substring search.  The default is empty.
604
 
605
.Vb int history_quotes_inhibit_expansion
606
If non-zero, single-quoted words are not scanned for the history expansion
607
character.  The default value is 0.
608
 
609
.Vb "rl_linebuf_func_t *" history_inhibit_expansion_function
610
This should be set to the address of a function that takes two arguments:
611
a \fBchar *\fP (\fIstring\fP)
612
and an \fBint\fP index into that string (\fIi\fP).
613
It should return a non-zero value if the history expansion starting at
614
\fIstring[i]\fP should not be performed; zero if the expansion should
615
be done.
616
It is intended for use by applications like \fBbash\fP that use the history
617
expansion character for additional purposes.
618
By default, this variable is set to \fBNULL\fP.
619
.SH FILES
620
.PD 0
621
.TP
622
.FN ~/.history
623
Default filename for reading and writing saved history
624
.PD
625
.SH "SEE ALSO"
626
.PD 0
627
.TP
628
\fIThe Gnu Readline Library\fP, Brian Fox and Chet Ramey
629
.TP
630
\fIThe Gnu History Library\fP, Brian Fox and Chet Ramey
631
.TP
632
\fIbash\fP(1)
633
.TP
634
\fIreadline\fP(3)
635
.PD
636
.SH AUTHORS
637
Brian Fox, Free Software Foundation
638
.br
639
bfox@gnu.org
640
.PP
641
Chet Ramey, Case Western Reserve University
642
.br
643
chet@ins.CWRU.Edu
644
.SH BUG REPORTS
645
If you find a bug in the
646
.B history
647
library, you should report it.  But first, you should
648
make sure that it really is a bug, and that it appears in the latest
649
version of the
650
.B history
651
library that you have.
652
.PP
653
Once you have determined that a bug actually exists, mail a
654
bug report to \fIbug\-readline\fP@\fIgnu.org\fP.
655
If you have a fix, you are welcome to mail that
656
as well!  Suggestions and `philosophical' bug reports may be mailed
657
to \fPbug-readline\fP@\fIgnu.org\fP or posted to the Usenet
658
newsgroup
659
.BR gnu.bash.bug .
660
.PP
661
Comments and bug reports concerning
662
this manual page should be directed to
663
.IR chet@ins.CWRU.Edu .

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