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This is Info file history.info, produced by Makeinfo version 1.67 from |
|||
the input file /usr/homes/chet/src/bash/readline-src/doc/hist.texinfo. |
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|
|||
INFO-DIR-SECTION Libraries |
|||
START-INFO-DIR-ENTRY |
|||
* History: (history). The GNU history library API |
|||
END-INFO-DIR-ENTRY |
|||
|
|||
This document describes the GNU History library, a programming tool |
|||
that provides a consistent user interface for recalling lines of |
|||
previously typed input. |
|||
|
|||
Copyright (C) 1988-1999 Free Software Foundation, Inc. |
|||
|
|||
Permission is granted to make and distribute verbatim copies of this |
|||
manual provided the copyright notice and this permission notice pare |
|||
preserved on all copies. |
|||
|
|||
Permission is granted to copy and distribute modified versions of |
|||
this manual under the conditions for verbatim copying, provided that |
|||
the entire resulting derived work is distributed under the terms of a |
|||
permission notice identical to this one. |
|||
|
|||
Permission is granted to copy and distribute translations of this |
|||
manual into another language, under the above conditions for modified |
|||
versions, except that this permission notice may be stated in a |
|||
translation approved by the Free Software Foundation. |
|||
|
|||
|
|||
File: history.info, Node: Top, Next: Using History Interactively, Up: (dir) |
|||
|
|||
GNU History Library |
|||
******************* |
|||
|
|||
This document describes the GNU History library, a programming tool |
|||
that provides a consistent user interface for recalling lines of |
|||
previously typed input. |
|||
|
|||
* Menu: |
|||
|
|||
* Using History Interactively:: GNU History User's Manual. |
|||
* Programming with GNU History:: GNU History Programmer's Manual. |
|||
* Concept Index:: Index of concepts described in this manual. |
|||
* Function and Variable Index:: Index of externally visible functions |
|||
and variables. |
|||
|
|||
|
|||
File: history.info, Node: Using History Interactively, Next: Programming with GNU History, Prev: Top, Up: Top |
|||
|
|||
Using History Interactively |
|||
*************************** |
|||
|
|||
This chapter describes how to use the GNU History Library |
|||
interactively, from a user's standpoint. It should be considered a |
|||
user's guide. For information on using the GNU History Library in your |
|||
own programs, *note Programming with GNU History::.. |
|||
|
|||
* Menu: |
|||
|
|||
* History Interaction:: What it feels like using History as a user. |
|||
|
|||
|
|||
File: history.info, Node: History Interaction, Up: Using History Interactively |
|||
|
|||
History Expansion |
|||
================= |
|||
|
|||
The History library provides a history expansion feature that is |
|||
similar to the history expansion provided by `csh'. This section |
|||
describes the syntax used to manipulate the history information. |
|||
|
|||
History expansions introduce words from the history list into the |
|||
input stream, making it easy to repeat commands, insert the arguments |
|||
to a previous command into the current input line, or fix errors in |
|||
previous commands quickly. |
|||
|
|||
History expansion takes place in two parts. The first is to |
|||
determine which line from the history list should be used during |
|||
substitution. The second is to select portions of that line for |
|||
inclusion into the current one. The line selected from the history is |
|||
called the "event", and the portions of that line that are acted upon |
|||
are called "words". Various "modifiers" are available to manipulate |
|||
the selected words. The line is broken into words in the same fashion |
|||
that Bash does, so that several words surrounded by quotes are |
|||
considered one word. History expansions are introduced by the |
|||
appearance of the history expansion character, which is `!' by default. |
|||
|
|||
* Menu: |
|||
|
|||
* Event Designators:: How to specify which history line to use. |
|||
* Word Designators:: Specifying which words are of interest. |
|||
* Modifiers:: Modifying the results of substitution. |
|||
|
|||
|
|||
File: history.info, Node: Event Designators, Next: Word Designators, Up: History Interaction |
|||
|
|||
Event Designators |
|||
----------------- |
|||
|
|||
An event designator is a reference to a command line entry in the |
|||
history list. |
|||
|
|||
`!' |
|||
Start a history substitution, except when followed by a space, tab, |
|||
the end of the line, `=' or `('. |
|||
|
|||
`!N' |
|||
Refer to command line N. |
|||
|
|||
`!-N' |
|||
Refer to the command N lines back. |
|||
|
|||
`!!' |
|||
Refer to the previous command. This is a synonym for `!-1'. |
|||
|
|||
`!STRING' |
|||
Refer to the most recent command starting with STRING. |
|||
|
|||
`!?STRING[?]' |
|||
Refer to the most recent command containing STRING. The trailing |
|||
`?' may be omitted if the STRING is followed immediately by a |
|||
newline. |
|||
|
|||
`^STRING1^STRING2^' |
|||
Quick Substitution. Repeat the last command, replacing STRING1 |
|||
with STRING2. Equivalent to `!!:s/STRING1/STRING2/'. |
|||
|
|||
`!#' |
|||
The entire command line typed so far. |
|||
|
|||
|
|||
File: history.info, Node: Word Designators, Next: Modifiers, Prev: Event Designators, Up: History Interaction |
|||
|
|||
Word Designators |
|||
---------------- |
|||
|
|||
Word designators are used to select desired words from the event. A |
|||
`:' separates the event specification from the word designator. It may |
|||
be omitted if the word designator begins with a `^', `$', `*', `-', or |
|||
`%'. Words are numbered from the beginning of the line, with the first |
|||
word being denoted by 0 (zero). Words are inserted into the current |
|||
line separated by single spaces. |
|||
|
|||
`0 (zero)' |
|||
The `0'th word. For many applications, this is the command word. |
|||
|
|||
`N' |
|||
The Nth word. |
|||
|
|||
`^' |
|||
The first argument; that is, word 1. |
|||
|
|||
`$' |
|||
The last argument. |
|||
|
|||
`%' |
|||
The word matched by the most recent `?STRING?' search. |
|||
|
|||
`X-Y' |
|||
A range of words; `-Y' abbreviates `0-Y'. |
|||
|
|||
`*' |
|||
All of the words, except the `0'th. This is a synonym for `1-$'. |
|||
It is not an error to use `*' if there is just one word in the |
|||
event; the empty string is returned in that case. |
|||
|
|||
`X*' |
|||
Abbreviates `X-$' |
|||
|
|||
`X-' |
|||
Abbreviates `X-$' like `X*', but omits the last word. |
|||
|
|||
If a word designator is supplied without an event specification, the |
|||
previous command is used as the event. |
|||
|
|||
|
|||
File: history.info, Node: Modifiers, Prev: Word Designators, Up: History Interaction |
|||
|
|||
Modifiers |
|||
--------- |
|||
|
|||
After the optional word designator, you can add a sequence of one or |
|||
more of the following modifiers, each preceded by a `:'. |
|||
|
|||
`h' |
|||
Remove a trailing pathname component, leaving only the head. |
|||
|
|||
`t' |
|||
Remove all leading pathname components, leaving the tail. |
|||
|
|||
`r' |
|||
Remove a trailing suffix of the form `.SUFFIX', leaving the |
|||
basename. |
|||
|
|||
`e' |
|||
Remove all but the trailing suffix. |
|||
|
|||
`p' |
|||
Print the new command but do not execute it. |
|||
|
|||
`s/OLD/NEW/' |
|||
Substitute NEW for the first occurrence of OLD in the event line. |
|||
Any delimiter may be used in place of `/'. The delimiter may be |
|||
quoted in OLD and NEW with a single backslash. If `&' appears in |
|||
NEW, it is replaced by OLD. A single backslash will quote the |
|||
`&'. The final delimiter is optional if it is the last character |
|||
on the input line. |
|||
|
|||
`&' |
|||
Repeat the previous substitution. |
|||
|
|||
`g' |
|||
Cause changes to be applied over the entire event line. Used in |
|||
conjunction with `s', as in `gs/OLD/NEW/', or with `&'. |
|||
|
|||
|
|||
File: history.info, Node: Programming with GNU History, Next: Concept Index, Prev: Using History Interactively, Up: Top |
|||
|
|||
Programming with GNU History |
|||
**************************** |
|||
|
|||
This chapter describes how to interface programs that you write with |
|||
the GNU History Library. It should be considered a technical guide. |
|||
For information on the interactive use of GNU History, *note Using |
|||
History Interactively::.. |
|||
|
|||
* Menu: |
|||
|
|||
* Introduction to History:: What is the GNU History library for? |
|||
* History Storage:: How information is stored. |
|||
* History Functions:: Functions that you can use. |
|||
* History Variables:: Variables that control behaviour. |
|||
* History Programming Example:: Example of using the GNU History Library. |
|||
|
|||
|
|||
File: history.info, Node: Introduction to History, Next: History Storage, Up: Programming with GNU History |
|||
|
|||
Introduction to History |
|||
======================= |
|||
|
|||
Many programs read input from the user a line at a time. The GNU |
|||
History library is able to keep track of those lines, associate |
|||
arbitrary data with each line, and utilize information from previous |
|||
lines in composing new ones. |
|||
|
|||
The programmer using the History library has available functions for |
|||
remembering lines on a history list, associating arbitrary data with a |
|||
line, removing lines from the list, searching through the list for a |
|||
line containing an arbitrary text string, and referencing any line in |
|||
the list directly. In addition, a history "expansion" function is |
|||
available which provides for a consistent user interface across |
|||
different programs. |
|||
|
|||
The user using programs written with the History library has the |
|||
benefit of a consistent user interface with a set of well-known |
|||
commands for manipulating the text of previous lines and using that text |
|||
in new commands. The basic history manipulation commands are similar to |
|||
the history substitution provided by `csh'. |
|||
|
|||
If the programmer desires, he can use the Readline library, which |
|||
includes some history manipulation by default, and has the added |
|||
advantage of command line editing. |
|||
|
|||
|
|||
File: history.info, Node: History Storage, Next: History Functions, Prev: Introduction to History, Up: Programming with GNU History |
|||
|
|||
History Storage |
|||
=============== |
|||
|
|||
The history list is an array of history entries. A history entry is |
|||
declared as follows: |
|||
|
|||
typedef struct _hist_entry { |
|||
char *line; |
|||
char *data; |
|||
} HIST_ENTRY; |
|||
|
|||
The history list itself might therefore be declared as |
|||
|
|||
HIST_ENTRY **the_history_list; |
|||
|
|||
The state of the History library is encapsulated into a single |
|||
structure: |
|||
|
|||
/* A structure used to pass the current state of the history stuff around. */ |
|||
typedef struct _hist_state { |
|||
HIST_ENTRY **entries; /* Pointer to the entries themselves. */ |
|||
int offset; /* The location pointer within this array. */ |
|||
int length; /* Number of elements within this array. */ |
|||
int size; /* Number of slots allocated to this array. */ |
|||
int flags; |
|||
} HISTORY_STATE; |
|||
|
|||
If the flags member includes `HS_STIFLED', the history has been |
|||
stifled. |
|||
|
|||
|
|||
File: history.info, Node: History Functions, Next: History Variables, Prev: History Storage, Up: Programming with GNU History |
|||
|
|||
History Functions |
|||
================= |
|||
|
|||
This section describes the calling sequence for the various functions |
|||
present in GNU History. |
|||
|
|||
* Menu: |
|||
|
|||
* Initializing History and State Management:: Functions to call when you |
|||
want to use history in a |
|||
program. |
|||
* History List Management:: Functions used to manage the list |
|||
of history entries. |
|||
* Information About the History List:: Functions returning information about |
|||
the history list. |
|||
* Moving Around the History List:: Functions used to change the position |
|||
in the history list. |
|||
* Searching the History List:: Functions to search the history list |
|||
for entries containing a string. |
|||
* Managing the History File:: Functions that read and write a file |
|||
containing the history list. |
|||
* History Expansion:: Functions to perform csh-like history |
|||
expansion. |
|||
|
|||
|
|||
File: history.info, Node: Initializing History and State Management, Next: History List Management, Up: History Functions |
|||
|
|||
Initializing History and State Management |
|||
----------------------------------------- |
|||
|
|||
This section describes functions used to initialize and manage the |
|||
state of the History library when you want to use the history functions |
|||
in your program. |
|||
|
|||
- Function: void using_history () |
|||
Begin a session in which the history functions might be used. This |
|||
initializes the interactive variables. |
|||
|
|||
- Function: HISTORY_STATE * history_get_history_state () |
|||
Return a structure describing the current state of the input |
|||
history. |
|||
|
|||
- Function: void history_set_history_state (HISTORY_STATE *state) |
|||
Set the state of the history list according to STATE. |
|||
|
|||
|
|||
File: history.info, Node: History List Management, Next: Information About the History List, Prev: Initializing History and State Management, Up: History Functions |
|||
|
|||
History List Management |
|||
----------------------- |
|||
|
|||
These functions manage individual entries on the history list, or set |
|||
parameters managing the list itself. |
|||
|
|||
- Function: void add_history (char *string) |
|||
Place STRING at the end of the history list. The associated data |
|||
field (if any) is set to `NULL'. |
|||
|
|||
- Function: HIST_ENTRY * remove_history (int which) |
|||
Remove history entry at offset WHICH from the history. The |
|||
removed element is returned so you can free the line, data, and |
|||
containing structure. |
|||
|
|||
- Function: HIST_ENTRY * replace_history_entry (int which, char *line, |
|||
char *data) |
|||
Make the history entry at offset WHICH have LINE and DATA. This |
|||
returns the old entry so you can dispose of the data. In the case |
|||
of an invalid WHICH, a `NULL' pointer is returned. |
|||
|
|||
- Function: void clear_history () |
|||
Clear the history list by deleting all the entries. |
|||
|
|||
- Function: void stifle_history (int max) |
|||
Stifle the history list, remembering only the last MAX entries. |
|||
|
|||
- Function: int unstifle_history () |
|||
Stop stifling the history. This returns the previous amount the |
|||
history was stifled. The value is positive if the history was |
|||
stifled, negative if it wasn't. |
|||
|
|||
- Function: int history_is_stifled () |
|||
Returns non-zero if the history is stifled, zero if it is not. |
|||
|
|||
|
|||
File: history.info, Node: Information About the History List, Next: Moving Around the History List, Prev: History List Management, Up: History Functions |
|||
|
|||
Information About the History List |
|||
---------------------------------- |
|||
|
|||
These functions return information about the entire history list or |
|||
individual list entries. |
|||
|
|||
- Function: HIST_ENTRY ** history_list () |
|||
Return a `NULL' terminated array of `HIST_ENTRY' which is the |
|||
current input history. Element 0 of this list is the beginning of |
|||
time. If there is no history, return `NULL'. |
|||
|
|||
- Function: int where_history () |
|||
Returns the offset of the current history element. |
|||
|
|||
- Function: HIST_ENTRY * current_history () |
|||
Return the history entry at the current position, as determined by |
|||
`where_history ()'. If there is no entry there, return a `NULL' |
|||
pointer. |
|||
|
|||
- Function: HIST_ENTRY * history_get (int offset) |
|||
Return the history entry at position OFFSET, starting from |
|||
`history_base'. If there is no entry there, or if OFFSET is |
|||
greater than the history length, return a `NULL' pointer. |
|||
|
|||
- Function: int history_total_bytes () |
|||
Return the number of bytes that the primary history entries are |
|||
using. This function returns the sum of the lengths of all the |
|||
lines in the history. |
|||
|
|||
|
|||
File: history.info, Node: Moving Around the History List, Next: Searching the History List, Prev: Information About the History List, Up: History Functions |
|||
|
|||
Moving Around the History List |
|||
------------------------------ |
|||
|
|||
These functions allow the current index into the history list to be |
|||
set or changed. |
|||
|
|||
- Function: int history_set_pos (int pos) |
|||
Set the position in the history list to POS, an absolute index |
|||
into the list. |
|||
|
|||
- Function: HIST_ENTRY * previous_history () |
|||
Back up the current history offset to the previous history entry, |
|||
and return a pointer to that entry. If there is no previous |
|||
entry, return a `NULL' pointer. |
|||
|
|||
- Function: HIST_ENTRY * next_history () |
|||
Move the current history offset forward to the next history entry, |
|||
and return the a pointer to that entry. If there is no next |
|||
entry, return a `NULL' pointer. |
|||
|
|||
|
|||
File: history.info, Node: Searching the History List, Next: Managing the History File, Prev: Moving Around the History List, Up: History Functions |
|||
|
|||
Searching the History List |
|||
-------------------------- |
|||
|
|||
These functions allow searching of the history list for entries |
|||
containing a specific string. Searching may be performed both forward |
|||
and backward from the current history position. The search may be |
|||
"anchored", meaning that the string must match at the beginning of the |
|||
history entry. |
|||
|
|||
- Function: int history_search (char *string, int direction) |
|||
Search the history for STRING, starting at the current history |
|||
offset. If DIRECTION < 0, then the search is through previous |
|||
entries, else through subsequent. If STRING is found, then the |
|||
current history index is set to that history entry, and the value |
|||
returned is the offset in the line of the entry where STRING was |
|||
found. Otherwise, nothing is changed, and a -1 is returned. |
|||
|
|||
- Function: int history_search_prefix (char *string, int direction) |
|||
Search the history for STRING, starting at the current history |
|||
offset. The search is anchored: matching lines must begin with |
|||
STRING. If DIRECTION < 0, then the search is through previous |
|||
entries, else through subsequent. If STRING is found, then the |
|||
current history index is set to that entry, and the return value |
|||
is 0. Otherwise, nothing is changed, and a -1 is returned. |
|||
|
|||
- Function: int history_search_pos (char *string, int direction, int |
|||
pos) |
|||
Search for STRING in the history list, starting at POS, an |
|||
absolute index into the list. If DIRECTION is negative, the search |
|||
proceeds backward from POS, otherwise forward. Returns the |
|||
absolute index of the history element where STRING was found, or |
|||
-1 otherwise. |
|||
|
|||
|
|||
File: history.info, Node: Managing the History File, Next: History Expansion, Prev: Searching the History List, Up: History Functions |
|||
|
|||
Managing the History File |
|||
------------------------- |
|||
|
|||
The History library can read the history from and write it to a file. |
|||
This section documents the functions for managing a history file. |
|||
|
|||
- Function: int read_history (char *filename) |
|||
Add the contents of FILENAME to the history list, a line at a |
|||
time. If FILENAME is `NULL', then read from `~/.history'. |
|||
Returns 0 if successful, or errno if not. |
|||
|
|||
- Function: int read_history_range (char *filename, int from, int to) |
|||
Read a range of lines from FILENAME, adding them to the history |
|||
list. Start reading at line FROM and end at TO. If FROM is zero, |
|||
start at the beginning. If TO is less than FROM, then read until |
|||
the end of the file. If FILENAME is `NULL', then read from |
|||
`~/.history'. Returns 0 if successful, or `errno' if not. |
|||
|
|||
- Function: int write_history (char *filename) |
|||
Write the current history to FILENAME, overwriting FILENAME if |
|||
necessary. If FILENAME is `NULL', then write the history list to |
|||
`~/.history'. Values returned are as in `read_history ()'. |
|||
|
|||
- Function: int append_history (int nelements, char *filename) |
|||
Append the last NELEMENTS of the history list to FILENAME. |
|||
|
|||
- Function: int history_truncate_file (char *filename, int nlines) |
|||
Truncate the history file FILENAME, leaving only the last NLINES |
|||
lines. |
|||
|
|||
|
|||
File: history.info, Node: History Expansion, Prev: Managing the History File, Up: History Functions |
|||
|
|||
History Expansion |
|||
----------------- |
|||
|
|||
These functions implement `csh'-like history expansion. |
|||
|
|||
- Function: int history_expand (char *string, char **output) |
|||
Expand STRING, placing the result into OUTPUT, a pointer to a |
|||
string (*note History Interaction::.). Returns: |
|||
`0' |
|||
If no expansions took place (or, if the only change in the |
|||
text was the de-slashifying of the history expansion |
|||
character); |
|||
|
|||
`1' |
|||
if expansions did take place; |
|||
|
|||
`-1' |
|||
if there was an error in expansion; |
|||
|
|||
`2' |
|||
if the returned line should only be displayed, but not |
|||
executed, as with the `:p' modifier (*note Modifiers::.). |
|||
|
|||
If an error ocurred in expansion, then OUTPUT contains a |
|||
descriptive error message. |
|||
|
|||
- Function: char * history_arg_extract (int first, int last, char |
|||
*string) |
|||
Extract a string segment consisting of the FIRST through LAST |
|||
arguments present in STRING. Arguments are broken up as in Bash. |
|||
|
|||
- Function: char * get_history_event (char *string, int *cindex, int |
|||
qchar) |
|||
Returns the text of the history event beginning at STRING + |
|||
*CINDEX. *CINDEX is modified to point to after the event |
|||
specifier. At function entry, CINDEX points to the index into |
|||
STRING where the history event specification begins. QCHAR is a |
|||
character that is allowed to end the event specification in |
|||
addition to the "normal" terminating characters. |
|||
|
|||
- Function: char ** history_tokenize (char *string) |
|||
Return an array of tokens parsed out of STRING, much as the shell |
|||
might. The tokens are split on white space and on the characters |
|||
`()<>;&|$', and shell quoting conventions are obeyed. |
|||
|
|||
|
|||
File: history.info, Node: History Variables, Next: History Programming Example, Prev: History Functions, Up: Programming with GNU History |
|||
|
|||
History Variables |
|||
================= |
|||
|
|||
This section describes the externally visible variables exported by |
|||
the GNU History Library. |
|||
|
|||
- Variable: int history_base |
|||
The logical offset of the first entry in the history list. |
|||
|
|||
- Variable: int history_length |
|||
The number of entries currently stored in the history list. |
|||
|
|||
- Variable: int max_input_history |
|||
The maximum number of history entries. This must be changed using |
|||
`stifle_history ()'. |
|||
|
|||
- Variable: char history_expansion_char |
|||
The character that starts a history event. The default is `!'. |
|||
|
|||
- Variable: char history_subst_char |
|||
The character that invokes word substitution if found at the start |
|||
of a line. The default is `^'. |
|||
|
|||
- Variable: char history_comment_char |
|||
During tokenization, if this character is seen as the first |
|||
character of a word, then it and all subsequent characters up to a |
|||
newline are ignored, suppressing history expansion for the |
|||
remainder of the line. This is disabled by default. |
|||
|
|||
- Variable: char * history_no_expand_chars |
|||
The list of characters which inhibit history expansion if found |
|||
immediately following HISTORY_EXPANSION_CHAR. The default is |
|||
whitespace and `='. |
|||
|
|||
- Variable: char * history_search_delimiter_chars |
|||
The list of additional characters which can delimit a history |
|||
search string, in addition to whitespace, `:' and `?' in the case |
|||
of a substring search. The default is empty. |
|||
|
|||
- Variable: int history_quotes_inhibit_expansion |
|||
If non-zero, single-quoted words are not scanned for the history |
|||
expansion character. The default value is 0. |
|||
|
|||
- Variable: Function * history_inhibit_expansion_function |
|||
This should be set to the address of a function that takes two |
|||
arguments: a `char *' (STRING) and an integer index into that |
|||
string (I). It should return a non-zero value if the history |
|||
expansion starting at STRING[I] should not be performed; zero if |
|||
the expansion should be done. It is intended for use by |
|||
applications like Bash that use the history expansion character |
|||
for additional purposes. By default, this variable is set to NULL. |
|||
|
|||
|
|||
File: history.info, Node: History Programming Example, Prev: History Variables, Up: Programming with GNU History |
|||
|
|||
History Programming Example |
|||
=========================== |
|||
|
|||
The following program demonstrates simple use of the GNU History |
|||
Library. |
|||
|
|||
main () |
|||
{ |
|||
char line[1024], *t; |
|||
int len, done = 0; |
|||
|
|||
line[0] = 0; |
|||
|
|||
using_history (); |
|||
while (!done) |
|||
{ |
|||
printf ("history$ "); |
|||
fflush (stdout); |
|||
t = fgets (line, sizeof (line) - 1, stdin); |
|||
if (t && *t) |
|||
{ |
|||
len = strlen (t); |
|||
if (t[len - 1] == '\n') |
|||
t[len - 1] = '\0'; |
|||
} |
|||
|
|||
if (!t) |
|||
strcpy (line, "quit"); |
|||
|
|||
if (line[0]) |
|||
{ |
|||
char *expansion; |
|||
int result; |
|||
|
|||
result = history_expand (line, &expansion); |
|||
if (result) |
|||
fprintf (stderr, "%s\n", expansion); |
|||
|
|||
if (result < 0 || result == 2) |
|||
{ |
|||
free (expansion); |
|||
continue; |
|||
} |
|||
|
|||
add_history (expansion); |
|||
strncpy (line, expansion, sizeof (line) - 1); |
|||
free (expansion); |
|||
} |
|||
|
|||
if (strcmp (line, "quit") == 0) |
|||
done = 1; |
|||
else if (strcmp (line, "save") == 0) |
|||
write_history ("history_file"); |
|||
else if (strcmp (line, "read") == 0) |
|||
read_history ("history_file"); |
|||
else if (strcmp (line, "list") == 0) |
|||
{ |
|||
register HIST_ENTRY **the_list; |
|||
register int i; |
|||
|
|||
the_list = history_list (); |
|||
if (the_list) |
|||
for (i = 0; the_list[i]; i++) |
|||
printf ("%d: %s\n", i + history_base, the_list[i]->line); |
|||
} |
|||
else if (strncmp (line, "delete", 6) == 0) |
|||
{ |
|||
int which; |
|||
if ((sscanf (line + 6, "%d", &which)) == 1) |
|||
{ |
|||
HIST_ENTRY *entry = remove_history (which); |
|||
if (!entry) |
|||
fprintf (stderr, "No such entry %d\n", which); |
|||
else |
|||
{ |
|||
free (entry->line); |
|||
free (entry); |
|||
} |
|||
} |
|||
else |
|||
{ |
|||
fprintf (stderr, "non-numeric arg given to `delete'\n"); |
|||
} |
|||
} |
|||
} |
|||
} |
|||
|
|||
|
|||
File: history.info, Node: Concept Index, Next: Function and Variable Index, Prev: Programming with GNU History, Up: Top |
|||
|
|||
Concept Index |
|||
************* |
|||
|
|||
* Menu: |
|||
|
|||
* anchored search: Searching the History List. |
|||
* event designators: Event Designators. |
|||
* history events: Event Designators. |
|||
* history expansion: History Interaction. |
|||
* History Searching: Searching the History List. |
|||
|
|||
|
|||
File: history.info, Node: Function and Variable Index, Prev: Concept Index, Up: Top |
|||
|
|||
Function and Variable Index |
|||
*************************** |
|||
|
|||
* Menu: |
|||
|
|||
* add_history: History List Management. |
|||
* append_history: Managing the History File. |
|||
* clear_history: History List Management. |
|||
* current_history: Information About the History List. |
|||
* get_history_event: History Expansion. |
|||
* history_arg_extract: History Expansion. |
|||
* history_base: History Variables. |
|||
* history_comment_char: History Variables. |
|||
* history_expand: History Expansion. |
|||
* history_expansion_char: History Variables. |
|||
* history_get: Information About the History List. |
|||
* history_get_history_state: Initializing History and State Management. |
|||
* history_inhibit_expansion_function: History Variables. |
|||
* history_is_stifled: History List Management. |
|||
* history_length: History Variables. |
|||
* history_list: Information About the History List. |
|||
* history_no_expand_chars: History Variables. |
|||
* history_quotes_inhibit_expansion: History Variables. |
|||
* history_search: Searching the History List. |
|||
* history_search_delimiter_chars: History Variables. |
|||
* history_search_pos: Searching the History List. |
|||
* history_search_prefix: Searching the History List. |
|||
* history_set_history_state: Initializing History and State Management. |
|||
* history_set_pos: Moving Around the History List. |
|||
* history_subst_char: History Variables. |
|||
* history_tokenize: History Expansion. |
|||
* history_total_bytes: Information About the History List. |
|||
* history_truncate_file: Managing the History File. |
|||
* max_input_history: History Variables. |
|||
* next_history: Moving Around the History List. |
|||
* previous_history: Moving Around the History List. |
|||
* read_history: Managing the History File. |
|||
* read_history_range: Managing the History File. |
|||
* remove_history: History List Management. |
|||
* replace_history_entry: History List Management. |
|||
* stifle_history: History List Management. |
|||
* unstifle_history: History List Management. |
|||
* using_history: Initializing History and State Management. |
|||
* where_history: Information About the History List. |
|||
* write_history: Managing the History File. |
|||
|
|||
|
|||
|
|||
Tag Table: |
|||
Node: Top1162 |
|||
Node: Using History Interactively1742 |
|||
Node: History Interaction2250 |
|||
Node: Event Designators3669 |
|||
Node: Word Designators4596 |
|||
Node: Modifiers5845 |
|||
Node: Programming with GNU History6983 |
|||
Node: Introduction to History7709 |
|||
Node: History Storage9030 |
|||
Node: History Functions10123 |
|||
Node: Initializing History and State Management11094 |
|||
Node: History List Management11886 |
|||
Node: Information About the History List13407 |
|||
Node: Moving Around the History List14713 |
|||
Node: Searching the History List15598 |
|||
Node: Managing the History File17430 |
|||
Node: History Expansion18936 |
|||
Node: History Variables20780 |
|||
Node: History Programming Example23098 |
|||
Node: Concept Index25702 |
|||
Node: Function and Variable Index26188 |
|||
|
|||
End Tag Table |
|||
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Reference in new issue