JIM(9.1) JIM(9.1) NAME jim, jim.recover - text editor SYNOPSIS jim [ files ] jim.recover [ -f ] [ -t ] [ files ] DESCRIPTION Jim is the text editor for the jerq terminal. It relies on the mouse to select text and commands. It runs only under mux(9.1). Jim's screen consists of a number of frames, a one-line command and diagnostic frame at the bottom and zero or more larger file frames above it. Except where indi- cated, 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. 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 sin- gle save buffer containing an arbitrary string. The editing commands invoke transformers between the selected region and the save buffer. 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 hold- ing button 1, an arbitrary contiguous visible string may be selected. Button 2 provides a small menu of text manipula- tion functions, described below. Button 3 provides control for inter-frame operations. The button 2 menu entries are: 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. paste Replace the selected text by the contents of the save buffer. snarf Copy the selected text to the save buffer. If the JIM(9.1) JIM(9.1) selected text is null, the save buffer is unaffected. 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. <mux> Exchange save buffers with mux. 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. Typing replaces the selected text with the typed text. If the selected text is not null, the first character typed forces an implicit cut. Control characters are discarded, but BS (control H), ETB (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 cut. ESC and paste provide the functionality for a simple undo feature. The button 3 menu entries are: new Create a new frame, much as in mux. reshape Change the shape of the indicated frame, as in mux. The frame is indicated by a button 3 hit after the selec- tion. close Close the indicated frame and its associated file. write Write the indicated frame's contents to its associated file. 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 mux. (Unlike mux, there is a shorthand: sweeping the empty rect- angle 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 cur- rent frame (for typing). The format of the lines in the menu is JIM(9.1) JIM(9.1) - possibly an apostrophe, indicating that the file has been modified since last written, - possibly a period or asterisk, indicating the file is open (asterisk) or the workframe (period), - a blank, - 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. The work frame has a scroll bar - a black vertical bar down the left edge. A small tick in the bar indicates the rela- tive position of the frame within the file. Pointing to the scroll bar and clicking a button controls scrolling opera- tions in the file: button 1 Move the line at the top of the screen to the y position of the mouse. button 2 Move to the absolute position in the file indi- cated by the y position of the mouse. button 3 Move the line at the y position of the mouse to the top of the screen. The bottom line frame is used for a few typed commands, mod- eled on ed(1), which operate on the work frame. When a car- riage return is typed in the bottom line, the line is inter- preted as a command. The bottom line scrolls, but only when the first character of the next line is typed. Thus, typi- cally, after some message appears in the bottom line, a com- mand need only be typed; the previous contents of the line will be automatically cleared. The commands available are: e file Edit the named file, or use the current file name if none specified. Note that each file frame has an asso- ciated file name. f file Set the name of the file associated with the work frame, if one is specified, and display the result. g files Enter the named 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 are passed through echo(1) for shell metacharacter interpretation. JIM(9.1) JIM(9.1) w file Write the named file, or use the current file name if none specified. The special command w' writes all mod- ified files with file names. q Quit the editor. = Print the line number of the beginning of the selected text. / 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 egrep(1), with two additions: the character `@' matches any character, including newline, and the sequence `\n' 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. ? Search backwards for the expression after the query. 94 Select the text of line 94, as in ed. cd Set the working directory, as in the shell. There is no CDPATH search. >Unix-command Send the selected text to the standard input of Unix- command. <Unix-command Replace the selected text by the standard output of Unix-command. |Unix-command Replace the selected text by the standard output of Unix-command, given the original selected text as stan- dard input. If any of <, > or | is preceded by an asterisk *, the com- mand is applied to the entire file, instead of just the selected text. If the command for < or | exits with non- zero status, the original text is not deleted; otherwise, the new text is selected. Finally, the standard error out- put of the command, which is merged with the standard output for >, is saved in the file $HOME/jim.err. If the file is non-empty when the command completes, the first line is dis- played in the diagnostic frame. Therefore the command `>pwd' will report jim's current directory. Attempts to quit with modified files, or edit a new file in JIM(9.1) JIM(9.1) a modified frame, are rejected. A second `q' or `e' command will succeed. The `Q' or `E' commands ignore modifications and work immediately. Some consistency checks are performed for the `w' command. Jim will reject write requests which it considers dangerous (such as writes which would change a file modified since read it into its memory). A second `w' will always write the file. If jim receives a hangup signal, it writes a file $HOME/jim.recover, which is a shell command file that, when executed, will retrieve the files that were modified when jim exited. The -t option prints a table of contents, but does not unpack the files. By default, jim.recover is interactive; the -f option suppresses the interaction. If no files are named to jim.recover, it will recover all the saved files. FILES /usr/jerq/mbin/jim.m terminal support program $HOME/jim.err saved diagnostic output from Unix commands BUGS The regular expression matcher is non-deterministic (unlike egrep), and may be slow for spectacular expressions. When reshaped, the open frames must be re-opened manually. The < and | operators should snarf the original text.