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-.TH JIM 9.1
-.SH NAME
-jim, jim.recover \- text editor
-.SH SYNOPSIS
-.B jim
-[
-.I file ...
-]
-.br
-.B jim.recover
-[
-.B -f
-]
-[
-.B -t
-]
-[
-.I file ...
-]
-.SH DESCRIPTION
-.I Jim
-is an old text editor for the jerq terminal.
-It relies on the mouse to select text and commands.
-It runs only under
-.IR mux (9.1).
-.IR Jim 's
-screen consists of a number of
-.IR frames ,
-a one-line command and diagnostic frame at the bottom
-and zero or more larger file frames above it.
-Except where indicated, these frames behave identically.
-One of the frames is always the current frame,
-to which typing and editing commands refer,
-and one of the file frames is the working frame,
-to which file commands such as pattern searching and IO refer.
-.PP
-A frame has at any time a selected region of text,
-indicated by reverse video highlighting.
-The selected region may be a null string between two characters,
-indicated by a narrow vertical bar between the characters.
-The editor has a single
-`save buffer'
-containing an arbitrary string.
-The editing commands invoke transformers between the
-selected region and the save buffer.
-.PP
-The mouse buttons are used for the most common operations.
-Button 1 (left) is used for selection.
-Clicking button 1 in a frame
-which is not the current frame makes the indicated frame current.
-Clicking button 1 in the current frame selects the null string closest
-to the mouse cursor.
-Making the same null selection twice (`double clicking') selects
-(in decreasing precedence) the bracketed or quoted string, word or line
-enclosing the selection.
-By pushing and holding button 1, an arbitrary contiguous visible string
-may be selected.
-Button 2 provides a small menu of text manipulation functions, described below.
-Button 3 provides control for inter-frame operations.
-.PP
-The button 2 menu entries are:
-.TP .7i
-.B cut
-Copy the selected text to the save buffer and delete it from the frame.
-If the selected text is null, the save buffer is unaffected.
-.TP
-.B paste
-Replace the selected text by the contents of the save buffer.
-.TP
-.B snarf
-Copy the selected text to the save buffer.
-If the selected text is null, the save buffer is unaffected.
-.TP
-.B look
-Search forward for the next occurrence of
-the selected text or, if the selection is null,
-to the next occurrence of the text in the save buffer.
-.TP
-.B <mux>
-Exchange save buffers with
-.IR mux .
-.PP
-Also stored on the button 2 menu are the last Unix command and last
-search string typed (see below); these may be selected to repeat the action.
-.PP
-Typing
-replaces the selected text with the typed text.
-If the selected text is not null,
-the first character typed forces an implicit
-.BR cut .
-Control characters are discarded, but
-BS 
-.RB (control- H ),
-ETB
-.RB (control- W )
-and ESC have special meanings.
-BS is the usual backspace character, which erases the character
-before the selected text (which is a null string when it takes effect).
-ETB erases back to the word boundary preceding the selected text.
-There is no line kill character.
-ESC selects the text typed since the last button hit or ESC.
-If an ESC is typed immediately after a button hit or ESC,
-it is identical to a
-.BR cut .
-ESC and
-.B paste
-provide the functionality for a simple undo feature.
-.PP
-The button 3 menu entries are:
-.TP
-.B new
-Create a new frame, much as in
-.IR mux .
-.TP
-.B reshape
-Change the shape of the indicated frame, as in
-.IR mux .
-The frame is indicated by a button 3 hit after the selection.
-.TP
-.B close
-Close the indicated frame and its associated file.
-.TP
-.B write
-Write the indicated frame's contents to its associated file.
-.PP
-The rest of the menu is a list of file names available for editing.
-To work in a different file, select the file from the menu.
-If the file is not open on the screen, the cursor will switch to an
-outline box to prompt for a rectangle to be swept out with button 3,
-as in the New operator of
-.IR mux .
-(Unlike
-.IR mux ,
-there is a shorthand: sweeping the empty rectangle creates the largest
-possible rectangle.)
-The file is not read until its frame is first opened.
-If the file is already open, it will simply be made the workframe and
-current frame (for typing).
-The format of the lines in the menu is
-.TP
--
-possibly an apostrophe, indicating that the file has been modified since
-last written,
-.TP
--
-possibly a period or asterisk, indicating the file is open (asterisk) or
-the workframe (period),
-.TP
--
-a blank,
-.TP
--
-and the file name.
-The file name may be abbreviated by compacting path components to keep
-the menu manageable, but the last component will always be complete.
-.PP
-The work frame has a
-`scroll bar'\(ema black vertical bar down the left edge.
-A small tick in the bar indicates the relative position of the frame
-within the file.
-Pointing to the scroll bar and clicking a button controls scrolling
-operations in the file:
-.TP 1i
-button 1
-Move the line at the top of the screen to the
-.I y
-position of the mouse.
-.TP
-button 2
-Move to the absolute position in the file indicated by the y position of the mouse.
-.TP
-button 3
-Move the line at the
-.I y
-position of the mouse to the top of the screen.
-.PP
-The bottom line frame is used for a few typed commands, modeled on
-.IR ed (1),
-which operate on the work frame.
-When a carriage return is typed in the bottom line,
-the line is interpreted as a command.
-The bottom line scrolls, but only
-when the first character of the next line is typed.
-Thus, typically, after some message appears in the bottom line,
-a command need only be typed;
-the previous contents of the line will be automatically cleared.
-The commands available are:
-.TP
-.BI e " file"
-Edit the named
-.IR file ,
-or use the current file name if none specified.
-Note that each file frame has an associated file name.
-.TP
-.BI f " file"
-Set the name of the
-file associated with the work frame, if one is specified,
-and display the result.
-.TP
-.BI g " file ..."
-Enter the named
-.I files
-into the filename menu, without duplication,
-and set the work frame to one of the named files.
-If the new work frame's file is not open, the user is prompted to create its frame.
-The arguments to
-.B g
-are passed through
-.IR echo (1)
-for shell metacharacter interpretation.
-.TP
-.BI w " file"
-Write the named
-.IR file ,
-or use the current file name if none specified.
-The special command
-.IR w \(aa
-writes all modified files with file names.
-.TP
-.B q
-Quit the editor.
-.TP
-.B =
-Print the line number of the beginning of the selected text.
-.TP
-.B /
-Search forward for the string matching the regular expression after the slash.
-If found, the matching text is selected.
-The regular expressions are exactly as in
-.IR egrep (1),
-with two additions: the character 
-.L @
-matches any character, including
-newline, and the sequence
-.L \en
-specifies a newline, even in character classes.
-The negation of a character class does not match a newline.
-An empty regular expression (slash-newline) repeats the last regular expression.
-.TP
-.B ?
-Search backwards for the expression after the query.
-.TP
-.B 94
-Select the text of line 94, as in
-.IR ed .
-.TP
-.B cd
-Set the working directory, as in the shell.
-There is no
-.B CDPATH
-search.
-.TP
-.BI > command
-Send the selected text to the standard input of the Unix
-.IR command .
-.TP
-.B < command
-Replace the selected text by the standard output of the Unix
-.IR command .
-.TP
-.B | command
-Replace the selected text by the standard output of the Unix
-.IR command,
-given the original selected text as standard input.
-.PP
-If any of
-.B < > |
-is preceded by an asterisk
-.BR * ,
-the command is applied to the entire file, instead of just the selected text.
-If the command for
-.B < 
-or
-.B | 
-exits with non-zero status, the original text
-is not deleted; otherwise, the new text is selected.
-Finally, the standard error output of the command, which is merged with the
-standard output for
-.BR > ,
-is saved in the file
-.FR $HOME/jim.err .
-If the file is non-empty when the command completes, the first line is
-displayed in the diagnostic frame.
-Therefore the command
-.L >pwd
-will report
-.I jim 's
-current directory.
-.PP
-Attempts to quit with modified files, or edit a new file
-in a modified frame, are rejected.
-A second 
-.L q
-or 
-.L e
-command will succeed.
-The 
-.L Q
-or 
-.L E
-commands ignore modifications and work immediately.
-Some consistency checks are performed for the 
-.L w
-command.
-.I Jim
-will reject write requests which it considers dangerous
-(such as writes which would change a file modified since
-.I jim
-read it into its memory).
-A second 
-.L w
-will always write the file.
-.PP
-If
-.I jim
-receives a hangup signal, it writes a file
-.FR $HOME/jim.recover ,
-which is a shell command file that, when executed, will retrieve
-the files that were modified when
-.I jim
-exited.
-The
-.B -t
-option prints a table of contents, but does not unpack the files.
-By default,
-.I jim.recover
-is interactive; the
-.B -f
-option suppresses the interaction.
-If no files are named to
-.FR jim.recover ,
-it will recover all the saved files.
-.SH FILES
-.F $HOME/jim.err
-.br
-.F $HOME/jim.recover
-.SH BUGS
-The regular expression matcher is non-deterministic,
-and may be slow for spectacular expressions.
-.br
-When reshaped, the open frames must be re-opened manually.
-.br
-The
-.B <
-and
-.B |
-operators should snarf the original text.