ACME(1)                                                   ACME(1)

     NAME
          acme, win, awd - interactive text windows

     SYNOPSIS
          acme [ -f varfont ] [ -F fixfont ] [ -c ncol ] [ -b ] [ -l
          file | file ... ]

          win [ command ]

          awd [ label ]

     DESCRIPTION
          Acme manages windows of text that may be edited interac-
          tively or by external programs.  The interactive interface
          uses the keyboard and mouse; external programs use a set of
          files served by acme; these are discussed in acme(4).

          Any named files are read into acme windows before acme
          accepts input.  With the -l option, the state of the entire
          system is loaded from file, which should have been created
          by a Dump command (q.v.), and subsequent file names are
          ignored.  Plain files display as text; directories display
          as columnated lists of the names of their components, as in
          ls -p directory|mc except that the names of subdirectories
          have a slash appended.

          The -f (-F) option sets the default variable-pitch (fixed-
          pitch) font; the default is
          /lib/font/bit/lucidasans/euro.8.font
          (.../lucm/unicode.9.font).  Tab intervals are set to the
          width of 4 numeral zeros in the variable-pitch font.

        Windows
          Acme windows are in two parts: a one-line tag above a
          multi-line body. The body typically contains an image of a
          file, as in sam(1), or the output of a program, as in an
          8½(1) window.  The tag contains a number of blank-separated
          words, followed by a vertical bar character, followed by
          anything.  The first word is the name of the window, typi-
          cally the name of the associated file or directory, and the
          other words are commands available in that window.  Any text
          may be added after the bar; examples are strings to search
          for or commands to execute in that window.  Changes to the
          text left of the bar will be ignored, unless the result is
          to change the name of the window.

          If a window holds a directory, the name (first word of the
          tag) will end with a slash.

        Scrolling

     ACME(1)                                                   ACME(1)

          Each window has a scroll bar to the left of the body.  The
          scroll bar behaves much as in sam(1) or 8½(1) except that
          scrolling occurs when the button is pressed, rather than
          released, and continues as long as the mouse button is held
          down in the scroll bar.  For example, to scroll slowly
          through a file, hold button 3 down near the top of the
          scroll bar.  Moving the mouse down the scroll bar speeds up
          the rate of scrolling.

        Layout
          Acme windows are arranged in columns.  By default, it cre-
          ates two columns when starting; this can be overridden with
          the -c option.  Placement is automatic but may be adjusted
          using the layout box in the upper left corner of each window
          and column.  Pressing and holding any mouse button in the
          box drags the associated window or column.  For windows,
          just clicking in the layout box grows the window in place:
          button 1 grows it a little, button 2 grows it as much as it
          can, still leaving all other tags in that column visible,
          and button 3 takes over the column completely, temporarily
          hiding other windows in the column.  (They will return en
          masse if any of them needs attention.)  The layout box in a
          window is normally white; when it is black in the center, it
          records that the file is `dirty': Acme believes it is modi-
          fied from its original contents.

          Tags exist at the top of each column and across the whole
          display.  Acme pre-loads them with useful commands.  Also,
          the tag across the top maintains a list of executing long-
          running commands.

        Typing
          The behavior of typed text is similar to that in 8½(1)
          except that the characters are delivered to the tag or body
          under the mouse; there is no `click to type'.  (The experi-
          mental option -b causes typing to go to the most recently
          clicked-at or made window.)  The usual backspacing conven-
          tions apply.  As in sam(1) but not 8½, the ESC key selects
          the text typed since the last mouse action, a feature par-
          ticularly useful when executing commands.  A side effect is
          that typing ESC with text already selected is identical to a
          Cut command (q.v.).

          Most text, including the names of windows, may be edited
          uniformly.  The only exception is that the command names to
          the left of the bar in a tag are maintained automatically;
          changes to them are repaired by acme.

        Directory context
          Each window's tag names a directory: explicitly if the win-
          dow holds a directory; implicitly if it holds a regular file
          (e.g. the directory /adm if the window holds /adm/users).

     ACME(1)                                                   ACME(1)

          This directory provides a context for interpreting file
          names in that window.  For example, the string users in a
          window labeled /adm/ or /adm/keys will be interpreted as the
          file name /adm/users.  The directory is defined purely tex-
          tually, so it can be a non-existent directory or a real
          directory associated with a non-existent file (e.g.
          /adm/not-a-file).  File names beginning with a slash are
          assumed to be absolute file names.

        Errors
          Windows whose names begin with - or + conventionally hold
          diagnostics and other data not directly associated with
          files.  A window labeled +Errors receives all diagnostics
          produced by acme itself.  Diagnostics from commands run by
          acme appear in a window named directory/+Errors where
          directory is identified by the context of the command.
          These error windows are created when needed.

        Mouse button 1
          Mouse button 1 selects text just as in sam(1) or 8½(1),
          including the usual double-clicking conventions.

        Mouse button 2
          By an action similar to selecting text with button 1, button
          2 indicates text to execute as a command.  If the indicated
          text has multiple white-space-separated words, the first is
          the command name and the second and subsequent are its argu-
          ments.  If button 2 is `clicked'-indicates a null string-
          acme expands the indicated text to find a command to run: if
          the click is within button-1-selected text, acme takes that
          selection as the command; otherwise it takes the largest
          string of valid file name characters containing the click.
          Valid file name characters are alphanumerics and _ . - + /.
          This behavior is similar to double-clicking with button 1
          but, because a null command is meaningless, only a single
          click is required.

          Some commands, all by convention starting with a capital
          letter, are built-ins that are executed directly by acme:

          Cut  Delete most recently selected text and place in snarf
               buffer.

          Del  Delete window.  If window is dirty, instead print a
               warning; a second Del will succeed.

          Delcol
               Delete column and all its windows, after checking that
               windows are not dirty.

          Delete
               Delete window without checking for dirtiness.

     ACME(1)                                                   ACME(1)

          Dump Write the state of acme to the file name, if specified,
               or $home/acme.dump by default.

          Exit Exit acme after checking that windows are not dirty.

          Font With no arguments, change the font of the associated
               window from fixed-spaced to proportional-spaced or vice
               versa. Given a file name argument, change the font of
               the window to that stored in the named file.  If the
               file name argument is prefixed by var (fix), also set
               the default proportional-spaced (fixed-spaced) font for
               future use to that font.  Other existing windows are
               unaffected.

          Get  Load file into window, replacing previous contents
               (after checking for dirtiness as in Del).  With no
               argument, use the existing file name of the window.
               Given an argument, use that file but do not change the
               window's file name.

          ID   Print window ID number (q.v.).

          Incl When opening `include' files (those enclosed in <>)
               with button 3, acme searches in directories
               /$objtype/include and /sys/include and, for alef(1)
               programs, /sys/include/alef.  Incl adds its arguments
               to a supplementary list of include directories, analo-
               gous to the -I option to the compilers.  This list is
               per-window and is inherited when windows are created by
               actions in that window, so Incl is most usefully
               applied to a directory containing relevant source.
               With no arguments, Incl prints the supplementary list.

          Kill Send a kill note to acme-initiated commands named as
               arguments.

          Local
               When prefixed to a command run the command in the same
               file name space and environment variable group as acme.
               The environment of the command is restricted but is
               sufficient to run bind(1), 9fs (see srv(4)), import(4),
               etc., and to set environment variables such as
               $objtype.

          Load Restore the state of acme from a file (default
               $home/acme.dump) created by the Dump command.

          Look Search in body for occurrence of literal text indicated
               by the argument or, if none is given, by the selected
               text in the body.

          New  Make new window.  With arguments, load the named files

     ACME(1)                                                   ACME(1)

               into windows.

          Newcol
               Make new column.

          Paste
               Replace most recently selected text with contents of
               snarf buffer.

          Put  Write window to the named file.  With no argument,
               write to the file named in the tag of the window.

          Putall
               Write all dirty windows whose names indicate existing
               regular files.

          Redo Complement of Undo.

          Send Append selected text or snarf buffer to end of body;
               used mainly with win.

          Snarf
               Place selected text in snarf buffer.

          Sort Arrange the windows in the column from top to bottom in
               lexicographical order based on their names.

          Undo Undo last textual change or set of changes.

          Zerox
               Create a copy of the window containing most recently
               selected text.

          A common place to store text for commands is in the tag; in
          fact acme maintains a set of commands appropriate to the
          state of the window to the left of the bar in the tag.

          If the text indicated with button 2 is not a recognized
          built-in, it is executed as a shell command.  For example,
          indicating date with button 2 runs date(1). The standard and
          error outputs of commands are sent to the error window asso-
          ciated with the directory from which the command was run,
          which will be created if necessary.  For example, in a win-
          dow /adm/users executing pwd will produce the output /adm in
          a (possibly newly-created) window labeled /adm/+Errors; in a
          window containing /sys/src/cmd/sam/sam.c executing mk will
          run mk(1) in /sys/src/cmd/sam, producing output in a window
          labeled /sys/src/cmd/sam/+Errors.

        Mouse button 3
          Pointing at text with button 3 instructs acme to locate or
          acquire the file, string, etc. described by the indicated

     ACME(1)                                                   ACME(1)

          text and its context.  This description follows the actions
          taken when button 3 is released after sweeping out some
          text.  In the description, text refers to the text of the
          original sweep or, if it was null, the result of applying
          the same expansion rules that apply to button 2 actions.

          If the text names an existing window, acme moves the mouse
          cursor to the selected text in the body of that window.  If
          the text names an existing file with no associated window,
          acme loads the file into a new window and moves the mouse
          there.  If the text is a file name contained in angle brack-
          ets, acme loads the indicated include file from the direc-
          tory appropriate to the suffix of the file name of the win-
          dow holding the text.  (The Incl command adds directories to
          the standard list.)

          If the text begins with a colon, it is taken to be an
          address, in the style of sam(1), within the body of the win-
          dow containing the text.  The address is evaluated, the
          resulting text highlighted, and the mouse moved to it.
          Thus, in acme, one must type :/regexp or :127 not just
          /regexp or 127.  (There is an easier way to locate literal
          text; see below.)

          If the text is a file name followed by a colon and an
          address, acme loads the file and evaluates the address.  For
          example, clicking button 3 anywhere in the text file.c:27
          will open file.c, select line 27, and put the mouse at the
          beginning of the line.  The rules about Error files, direc-
          tories, and so on all combine to make this an efficient way
          to investigate errors from compilers, etc.

          If the text is not an address or file, it is taken to be
          literal text, which is then searched for in the body of the
          window in which button 3 was clicked.  If a match is found,
          it is selected and the mouse is moved there.  Thus, to
          search for occurrences of a word in a file, just click but-
          ton 3 on the word.  Because of the rule of using the selec-
          tion as the button 3 action, subsequent clicks will find
          subsequent occurrences without moving the mouse.

          In all these actions, the mouse motion is not done if the
          text is a null string within a non-null selected string in
          the tag, so that (for example) complex regular expressions
          may be selected and applied repeatedly to the body by just
          clicking button 3 over them.

        Chords of mouse buttons
          Several operations are bound to multiple-button actions.
          After selecting text, with button 1 still down, pressing
          button 2 executes Cut and button 3 executes Paste.  After
          clicking one button, the other undoes the first; thus (while

     ACME(1)                                                   ACME(1)

          holding down button 1) 2 followed by 3 is a Snarf that
          leaves the file undirtied; 3 followed by 2 is a no-op.
          These actions also apply to text selected by double-clicking
          because the double-click expansion is made when the second
          click starts, not when it ends.

          Commands may be given extra arguments by a mouse chord with
          buttons 2 and 1.  While holding down button 2 on text to be
          executed as a command, clicking button 1 appends the text
          last pointed to by button 1 as a distinct final argument.
          For example, to search for literal text one may execute Look
          text with button 2 or instead point at text with button 1 in
          any window, release button 1, then execute Look, clicking
          button 1 while 2 is held down.

          When an external command (e.g.  echo(1)) is executed this
          way, the extra argument is passed as expected and an envi-
          ronment variable $acmeaddr is created that holds, in the
          form interpreted by button 3, the fully-qualified address of
          the extra argument.

        Support programs
          Win creates a new acme window and runs a command (default
          /bin/rc) in it, turning the window into something analogous
          to an 8½(1) window.  Executing text in a win window with
          button 2 is similar to using Send.

          Awd loads the tag line of its window with the directory in
          which it's running, suffixed -label (default rc); it is
          intended to be executed by a cd function for use in win win-
          dows.  An example definition is
               fn cd { builtin cd $1 && awd $sysname }

        Applications and guide files
          In the directory /acme live several subdirectories, each
          corresponding to a program or set of related programs that
          employ acme's user interface.  Each subdirectory includes
          source, binaries, and a readme file for further information.
          It also includes a guide, a text file holding sample com-
          mands to invoke the programs.  The idea is to find an exam-
          ple in the guide that best matches the job at hand, edit it
          to suit, and execute it.

          Whenever a command is executed by acme, the default search
          path includes the directory of the window containing the
          command and its subdirectory $cputype.  The program directo-
          ries in /acme contain appropriately labeled subdirectories
          of binaries, so commands named in the guide files will be
          found automatically when run.  Also, acme binds the directo-
          ries /acme/bin and /acme/bin/$cputype to the end of /bin
          when it starts; this is where acme-specific programs such as
          win and awd reside.

     ACME(1)                                                   ACME(1)

     FILES
          $home/acme.dump  default file for Dump and Load; also where
                           state is written if acme dies or is killed
                           unexpectedly, e.g. by deleting its window.
          /acme/*/guide    template files for applications
          /acme/*/readme   informal documentation for applications
          /acme/*/src      source for applications
          /acme/*/mips     MIPS-specific binaries for applications

     SOURCE
          /sys/src/cmd/acme
          /acme/bin/src/win.l
          /sys/src/cmd/awd.c

     SEE ALSO
          acme(4)
          Rob Pike, Acme: A User Interface for Programmers.

     BUGS
          Because of a bug in 8½(1), when returning to the acme window
          after working in another, acme may not know the correct
          mouse position until a button is clicked.

          With the -l option or Load command, the recreation of win-
          dows under control of external programs such as win is just
          to rerun the command; information may be lost.