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Revision 332 - (hide annotations)
Thu Oct 23 19:03:33 2008 UTC (11 years, 11 months ago) by siliconforks
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1 siliconforks 332 .TH EDITLINE 3
2     .SH NAME
3     editline \- command-line editing library with history
4     .SH SYNOPSIS
5     .nf
6     .B "char *"
7     .B "readline(prompt)"
8     .B " char *prompt;"
9    
10     .B "void"
11     .B "add_history(line)"
12     .B " char *line;"
13     .fi
14     .SH DESCRIPTION
15     .I Editline
16     is a library that provides an line-editing interface with text recall.
17     It is intended to be compatible with the
18     .I readline
19     library provided by the Free Software Foundation, but much smaller.
20     The bulk of this manual page describes the user interface.
21     .PP
22     The
23     .I readline
24     routine returns a line of text with the trailing newline removed.
25     The data is returned in a buffer allocated with
26     .IR malloc (3),
27     so the space should be released with
28     .IR free (3)
29     when the calling program is done with it.
30     Before accepting input from the user, the specified
31     .I prompt
32     is displayed on the terminal.
33     .PP
34     The
35     .I add_history
36     routine makes a copy of the specified
37     .I line
38     and adds it to the internal history list.
39     .SS "User Interface"
40     A program that uses this library provides a simple emacs-like editing
41     interface to its users.
42     A line may be edited before it is sent to the calling program by typing either
43     control characters or escape sequences.
44     A control character, shown as a caret followed by a letter, is typed by
45     holding down the ``control'' key while the letter is typed.
46     For example, ``^A'' is a control-A.
47     An escape sequence is entered by typing the ``escape'' key followed by one or
48     more characters.
49     The escape key is abbreviated as ``ESC.''
50     Note that unlike control keys, case matters in escape sequences; ``ESC\ F''
51     is not the same as ``ESC\ f''.
52     .PP
53     An editing command may be typed anywhere on the line, not just at the
54     beginning.
55     In addition, a return may also be typed anywhere on the line, not just at
56     the end.
57     .PP
58     Most editing commands may be given a repeat count,
59     .IR n ,
60     where
61     .I n
62     is a number.
63     To enter a repeat count, type the escape key, the number, and then
64     the command to execute.
65     For example, ``ESC\ 4\ ^f'' moves forward four characters.
66     If a command may be given a repeat count then the text ``[n]'' is given at the
67     end of its description.
68     .PP
69     The following control characters are accepted:
70     .RS
71     .nf
72     .ta \w'ESC DEL 'u
73     ^A Move to the beginning of the line
74     ^B Move left (backwards) [n]
75     ^D Delete character [n]
76     ^E Move to end of line
77     ^F Move right (forwards) [n]
78     ^G Ring the bell
79     ^H Delete character before cursor (backspace key) [n]
80     ^I Complete filename (tab key); see below
81     ^J Done with line (return key)
82     ^K Kill to end of line (or column [n])
83     ^L Redisplay line
84     ^M Done with line (alternate return key)
85     ^N Get next line from history [n]
86     ^P Get previous line from history [n]
87     ^R Search backward (forward if [n]) through history for text;
88     \& must start line if text begins with an uparrow
89     ^T Transpose characters
90     ^V Insert next character, even if it is an edit command
91     ^W Wipe to the mark
92     ^X^X Exchange current location and mark
93     ^Y Yank back last killed text
94     ^[ Start an escape sequence (escape key)
95     ^]c Move forward to next character ``c''
96     ^? Delete character before cursor (delete key) [n]
97     .fi
98     .RE
99     .PP
100     The following escape sequences are provided.
101     .RS
102     .nf
103     .ta \w'ESC DEL 'u
104     ESC\ ^H Delete previous word (backspace key) [n]
105     ESC\ DEL Delete previous word (delete key) [n]
106     ESC\ SP Set the mark (space key); see ^X^X and ^Y above
107     ESC\ \. Get the last (or [n]'th) word from previous line
108     ESC\ \? Show possible completions; see below
109     ESC\ < Move to start of history
110     ESC\ > Move to end of history
111     ESC\ b Move backward a word [n]
112     ESC\ d Delete word under cursor [n]
113     ESC\ f Move forward a word [n]
114     ESC\ l Make word lowercase [n]
115     ESC\ m Toggle if 8bit chars display normally or with ``M\-'' prefix
116     ESC\ u Make word uppercase [n]
117     ESC\ y Yank back last killed text
118     ESC\ v Show library version
119     ESC\ w Make area up to mark yankable
120     ESC\ nn Set repeat count to the number nn
121     ESC\ C Read from environment variable ``_C_'', where C is
122     \& an uppercase letter
123     .fi
124     .RE
125     .PP
126     The
127     .I editline
128     library has a small macro facility.
129     If you type the escape key followed by an uppercase letter,
130     .IR C ,
131     then the contents of the environment variable
132     .I _C_
133     are read in as if you had typed them at the keyboard.
134     For example, if the variable
135     .I _L_
136     contains the following:
137     .RS
138     ^A^Kecho '^V^[[H^V^[[2J'^M
139     .RE
140     Then typing ``ESC L'' will move to the beginning of the line, kill the
141     entire line, enter the echo command needed to clear the terminal (if your
142     terminal is like a VT-100), and send the line back to the shell.
143     .PP
144     The
145     .I editline
146     library also does filename completion.
147     Suppose the root directory has the following files in it:
148     .RS
149     .nf
150     .ta \w'core 'u
151     bin vmunix
152     core vmunix.old
153     .fi
154     .RE
155     If you type ``rm\ /v'' and then the tab key.
156     .I Editline
157     will then finish off as much of the name as possible by adding ``munix''.
158     Because the name is not unique, it will then beep.
159     If you type the escape key and a question mark, it will display the
160     two choices.
161     If you then type a period and a tab, the library will finish off the filename
162     for you:
163     .RS
164     .nf
165     .RI "rm /v[TAB]" munix .TAB old
166     .fi
167     .RE
168     The tab key is shown by ``[TAB]'' and the automatically-entered text
169     is shown in italics.
170     .SH "BUGS AND LIMITATIONS"
171     Cannot handle lines more than 80 columns.
172     .SH AUTHORS
173     Simmule R. Turner <uunet.uu.net!capitol!sysgo!simmy>
174     and Rich $alz <rsalz@osf.org>.
175     Original manual page by DaviD W. Sanderson <dws@ssec.wisc.edu>.

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