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Diffstat (limited to 'lisp/forms.el')
-rw-r--r-- | lisp/forms.el | 525 |
1 files changed, 263 insertions, 262 deletions
diff --git a/lisp/forms.el b/lisp/forms.el index 9466077f6de..9a8217fb185 100644 --- a/lisp/forms.el +++ b/lisp/forms.el @@ -17,269 +17,270 @@ ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License -;; along with GNU Emacs; see the file COPYING. If not, write to -;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. +;; along with GNU Emacs; see the file COPYING. If not, write to the +;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. ;;; Commentary: -;;; Visit a file using a form. -;;; -;;; === Naming conventions -;;; -;;; The names of all variables and functions start with 'forms-'. -;;; Names which start with 'forms--' are intended for internal use, and -;;; should *NOT* be used from the outside. -;;; -;;; All variables are buffer-local, to enable multiple forms visits -;;; simultaneously. -;;; Variable `forms--mode-setup' is local to *ALL* buffers, for it -;;; controls if forms-mode has been enabled in a buffer. -;;; -;;; === How it works === -;;; -;;; Forms mode means visiting a data file which is supposed to consist -;;; of records each containing a number of fields. The records are -;;; separated by a newline, the fields are separated by a user-defined -;;; field separator (default: TAB). -;;; When shown, a record is transferred to an Emacs buffer and -;;; presented using a user-defined form. One record is shown at a -;;; time. -;;; -;;; Forms mode is a composite mode. It involves two files, and two -;;; buffers. -;;; The first file, called the control file, defines the name of the -;;; data file and the forms format. This file buffer will be used to -;;; present the forms. -;;; The second file holds the actual data. The buffer of this file -;;; will be buried, for it is never accessed directly. -;;; -;;; Forms mode is invoked using M-x forms-find-file control-file . -;;; Alternatively `forms-find-file-other-window' can be used. -;;; -;;; You may also visit the control file, and switch to forms mode by hand -;;; with M-x forms-mode . -;;; -;;; Automatic mode switching is supported if you specify -;;; "-*- forms -*-" in the first line of the control file. -;;; -;;; The control file is visited, evaluated using `eval-current-buffer', -;;; and should set at least the following variables: -;;; -;;; forms-file [string] -;;; The name of the data file. -;;; -;;; forms-number-of-fields [integer] -;;; The number of fields in each record. -;;; -;;; forms-format-list [list] -;;; Formatting instructions. -;;; -;;; `forms-format-list' should be a list, each element containing -;;; -;;; - a string, e.g. "hello". The string is inserted in the forms -;;; "as is". -;;; -;;; - an integer, denoting a field number. -;;; The contents of this field are inserted at this point. -;;; Fields are numbered starting with number one. -;;; -;;; - a function call, e.g. (insert "text"). -;;; This function call is dynamically evaluated and should return a -;;; string. It should *NOT* have side-effects on the forms being -;;; constructed. The current fields are available to the function -;;; in the variable `forms-fields', they should *NOT* be modified. -;;; -;;; - a lisp symbol, that must evaluate to one of the above. -;;; -;;; Optional variables which may be set in the control file: -;;; -;;; forms-field-sep [string, default TAB] -;;; The field separator used to separate the -;;; fields in the data file. It may be a string. -;;; -;;; forms-read-only [bool, default nil] -;;; Non-nil means that the data file is visited -;;; read-only (view mode) as opposed to edit mode. -;;; If no write access to the data file is -;;; possible, view mode is enforced. -;;; -;;; forms-check-number-of-fields [bool, default t] -;;; If non-nil, a warning will be issued whenever -;;; a record is found that does not have the number -;;; of fields specified by `forms-number-of-fields'. -;;; -;;; forms-multi-line [string, default "^K"] -;;; If non-null the records of the data file may -;;; contain fields that can span multiple lines in -;;; the form. -;;; This variable denotes the separator character -;;; to be used for this purpose. Upon display, all -;;; occurrences of this character are translated -;;; to newlines. Upon storage they are translated -;;; back to the separator character. -;;; -;;; forms-forms-scroll [bool, default nil] -;;; Non-nil means: rebind locally the commands that -;;; perform `scroll-up' or `scroll-down' to use -;;; `forms-next-field' resp. `forms-prev-field'. -;;; -;;; forms-forms-jump [bool, default nil] -;;; Non-nil means: rebind locally the commands that -;;; perform `beginning-of-buffer' or `end-of-buffer' -;;; to perform `forms-first-field' resp. `forms-last-field'. -;;; -;;; forms-read-file-filter [symbol, default nil] -;;; If not nil: this should be the name of a -;;; function that is called after the forms data file -;;; has been read. It can be used to transform -;;; the contents of the file into a format more suitable -;;; for forms-mode processing. -;;; -;;; forms-write-file-filter [symbol, default nil] -;;; If not nil: this should be the name of a -;;; function that is called before the forms data file -;;; is written (saved) to disk. It can be used to undo -;;; the effects of `forms-read-file-filter', if any. -;;; -;;; forms-new-record-filter [symbol, default nil] -;;; If not nil: this should be the name of a -;;; function that is called when a new -;;; record is created. It can be used to fill in -;;; the new record with default fields, for example. -;;; -;;; forms-modified-record-filter [symbol, default nil] -;;; If not nil: this should be the name of a -;;; function that is called when a record has -;;; been modified. It is called after the fields -;;; are parsed. It can be used to register -;;; modification dates, for example. -;;; -;;; forms-use-text-properties [bool, see text for default] -;;; This variable controls if forms mode should use -;;; text properties to protect the form text from being -;;; modified (using text-property `read-only'). -;;; Also, the read-write fields are shown using a -;;; distinct face, if possible. -;;; As of emacs 19.29, the `intangible' text property -;;; is used to prevent moving into read-only fields. -;;; This variable defaults to t if running Emacs 19 -;;; with text properties. -;;; The default face to show read-write fields is -;;; copied from face `region'. -;;; -;;; forms-ro-face [symbol, default 'default] -;;; This is the face that is used to show -;;; read-only text on the screen.If used, this -;;; variable should be set to a symbol that is a -;;; valid face. -;;; E.g. -;;; (make-face 'my-face) -;;; (setq forms-ro-face 'my-face) -;;; -;;; forms-rw-face [symbol, default 'region] -;;; This is the face that is used to show -;;; read-write text on the screen. -;;; -;;; After evaluating the control file, its buffer is cleared and used -;;; for further processing. -;;; The data file (as designated by `forms-file') is visited in a buffer -;;; `forms--file-buffer' which will not normally be shown. -;;; Great malfunctioning may be expected if this file/buffer is modified -;;; outside of this package while it is being visited! -;;; -;;; Normal operation is to transfer one line (record) from the data file, -;;; split it into fields (into `forms--the-record-list'), and display it -;;; using the specs in `forms-format-list'. -;;; A format routine `forms--format' is built upon startup to format -;;; the records according to `forms-format-list'. -;;; -;;; When a form is changed the record is updated as soon as this form -;;; is left. The contents of the form are parsed using information -;;; obtained from `forms-format-list', and the fields which are -;;; deduced from the form are modified. Fields not shown on the forms -;;; retain their original values. The newly formed record then -;;; replaces the contents of the old record in `forms--file-buffer'. -;;; A parse routine `forms--parser' is built upon startup to parse -;;; the records. -;;; -;;; Two exit functions exist: `forms-exit' and `forms-exit-no-save'. -;;; `forms-exit' saves the data to the file, if modified. -;;; `forms-exit-no-save` does not. However, if `forms-exit-no-save' -;;; is executed and the file buffer has been modified, Emacs will ask -;;; questions anyway. -;;; -;;; Other functions provided by forms mode are: -;;; -;;; paging (forward, backward) by record -;;; jumping (first, last, random number) -;;; searching -;;; creating and deleting records -;;; reverting the form (NOT the file buffer) -;;; switching edit <-> view mode v.v. -;;; jumping from field to field -;;; -;;; As an documented side-effect: jumping to the last record in the -;;; file (using forms-last-record) will adjust forms--total-records if -;;; needed. -;;; -;;; The forms buffer can be in on eof two modes: edit mode or view -;;; mode. View mode is a read-only mode, you cannot modify the -;;; contents of the buffer. -;;; -;;; Edit mode commands: -;;; -;;; TAB forms-next-field -;;; \C-c TAB forms-next-field -;;; \C-c < forms-first-record -;;; \C-c > forms-last-record -;;; \C-c ? describe-mode -;;; \C-c \C-k forms-delete-record -;;; \C-c \C-q forms-toggle-read-only -;;; \C-c \C-o forms-insert-record -;;; \C-c \C-l forms-jump-record -;;; \C-c \C-n forms-next-record -;;; \C-c \C-p forms-prev-record -;;; \C-c \C-r forms-search-backward -;;; \C-c \C-s forms-search-forward -;;; \C-c \C-x forms-exit -;;; -;;; Read-only mode commands: -;;; -;;; SPC forms-next-record -;;; DEL forms-prev-record -;;; ? describe-mode -;;; \C-q forms-toggle-read-only -;;; l forms-jump-record -;;; n forms-next-record -;;; p forms-prev-record -;;; r forms-search-backward -;;; s forms-search-forward -;;; x forms-exit -;;; -;;; Of course, it is also possible to use the \C-c prefix to obtain the -;;; same command keys as in edit mode. -;;; -;;; The following bindings are available, independent of the mode: -;;; -;;; [next] forms-next-record -;;; [prior] forms-prev-record -;;; [begin] forms-first-record -;;; [end] forms-last-record -;;; [S-TAB] forms-prev-field -;;; [backtab] forms-prev-field -;;; -;;; For convenience, TAB is always bound to `forms-next-field', so you -;;; don't need the C-c prefix for this command. -;;; -;;; As mentioned above (see `forms-forms-scroll' and `forms-forms-jump') -;;; the bindings of standard functions `scroll-up', `scroll-down', -;;; `beginning-of-buffer' and `end-of-buffer' can be locally replaced with -;;; forms mode functions next/prev record and first/last -;;; record. -;;; -;;; `local-write-file hook' is defined to save the actual data file -;;; instead of the buffer data, `revert-file-hook' is defined to -;;; revert a forms to original. +;; Visit a file using a form. +;; +;; === Naming conventions +;; +;; The names of all variables and functions start with 'forms-'. +;; Names which start with 'forms--' are intended for internal use, and +;; should *NOT* be used from the outside. +;; +;; All variables are buffer-local, to enable multiple forms visits +;; simultaneously. +;; Variable `forms--mode-setup' is local to *ALL* buffers, for it +;; controls if forms-mode has been enabled in a buffer. +;; +;; === How it works === +;; +;; Forms mode means visiting a data file which is supposed to consist +;; of records each containing a number of fields. The records are +;; separated by a newline, the fields are separated by a user-defined +;; field separator (default: TAB). +;; When shown, a record is transferred to an Emacs buffer and +;; presented using a user-defined form. One record is shown at a +;; time. +;; +;; Forms mode is a composite mode. It involves two files, and two +;; buffers. +;; The first file, called the control file, defines the name of the +;; data file and the forms format. This file buffer will be used to +;; present the forms. +;; The second file holds the actual data. The buffer of this file +;; will be buried, for it is never accessed directly. +;; +;; Forms mode is invoked using M-x forms-find-file control-file . +;; Alternatively `forms-find-file-other-window' can be used. +;; +;; You may also visit the control file, and switch to forms mode by hand +;; with M-x forms-mode . +;; +;; Automatic mode switching is supported if you specify +;; "-*- forms -*-" in the first line of the control file. +;; +;; The control file is visited, evaluated using `eval-current-buffer', +;; and should set at least the following variables: +;; +;; forms-file [string] +;; The name of the data file. +;; +;; forms-number-of-fields [integer] +;; The number of fields in each record. +;; +;; forms-format-list [list] +;; Formatting instructions. +;; +;; `forms-format-list' should be a list, each element containing +;; +;; - a string, e.g. "hello". The string is inserted in the forms +;; "as is". +;; +;; - an integer, denoting a field number. +;; The contents of this field are inserted at this point. +;; Fields are numbered starting with number one. +;; +;; - a function call, e.g. (insert "text"). +;; This function call is dynamically evaluated and should return a +;; string. It should *NOT* have side-effects on the forms being +;; constructed. The current fields are available to the function +;; in the variable `forms-fields', they should *NOT* be modified. +;; +;; - a lisp symbol, that must evaluate to one of the above. +;; +;; Optional variables which may be set in the control file: +;; +;; forms-field-sep [string, default TAB] +;; The field separator used to separate the +;; fields in the data file. It may be a string. +;; +;; forms-read-only [bool, default nil] +;; Non-nil means that the data file is visited +;; read-only (view mode) as opposed to edit mode. +;; If no write access to the data file is +;; possible, view mode is enforced. +;; +;; forms-check-number-of-fields [bool, default t] +;; If non-nil, a warning will be issued whenever +;; a record is found that does not have the number +;; of fields specified by `forms-number-of-fields'. +;; +;; forms-multi-line [string, default "^K"] +;; If non-null the records of the data file may +;; contain fields that can span multiple lines in +;; the form. +;; This variable denotes the separator character +;; to be used for this purpose. Upon display, all +;; occurrences of this character are translated +;; to newlines. Upon storage they are translated +;; back to the separator character. +;; +;; forms-forms-scroll [bool, default nil] +;; Non-nil means: rebind locally the commands that +;; perform `scroll-up' or `scroll-down' to use +;; `forms-next-field' resp. `forms-prev-field'. +;; +;; forms-forms-jump [bool, default nil] +;; Non-nil means: rebind locally the commands that +;; perform `beginning-of-buffer' or `end-of-buffer' +;; to perform `forms-first-field' resp. `forms-last-field'. +;; +;; forms-read-file-filter [symbol, default nil] +;; If not nil: this should be the name of a +;; function that is called after the forms data file +;; has been read. It can be used to transform +;; the contents of the file into a format more suitable +;; for forms-mode processing. +;; +;; forms-write-file-filter [symbol, default nil] +;; If not nil: this should be the name of a +;; function that is called before the forms data file +;; is written (saved) to disk. It can be used to undo +;; the effects of `forms-read-file-filter', if any. +;; +;; forms-new-record-filter [symbol, default nil] +;; If not nil: this should be the name of a +;; function that is called when a new +;; record is created. It can be used to fill in +;; the new record with default fields, for example. +;; +;; forms-modified-record-filter [symbol, default nil] +;; If not nil: this should be the name of a +;; function that is called when a record has +;; been modified. It is called after the fields +;; are parsed. It can be used to register +;; modification dates, for example. +;; +;; forms-use-text-properties [bool, see text for default] +;; This variable controls if forms mode should use +;; text properties to protect the form text from being +;; modified (using text-property `read-only'). +;; Also, the read-write fields are shown using a +;; distinct face, if possible. +;; As of emacs 19.29, the `intangible' text property +;; is used to prevent moving into read-only fields. +;; This variable defaults to t if running Emacs 19 +;; with text properties. +;; The default face to show read-write fields is +;; copied from face `region'. +;; +;; forms-ro-face [symbol, default 'default] +;; This is the face that is used to show +;; read-only text on the screen.If used, this +;; variable should be set to a symbol that is a +;; valid face. +;; E.g. +;; (make-face 'my-face) +;; (setq forms-ro-face 'my-face) +;; +;; forms-rw-face [symbol, default 'region] +;; This is the face that is used to show +;; read-write text on the screen. +;; +;; After evaluating the control file, its buffer is cleared and used +;; for further processing. +;; The data file (as designated by `forms-file') is visited in a buffer +;; `forms--file-buffer' which will not normally be shown. +;; Great malfunctioning may be expected if this file/buffer is modified +;; outside of this package while it is being visited! +;; +;; Normal operation is to transfer one line (record) from the data file, +;; split it into fields (into `forms--the-record-list'), and display it +;; using the specs in `forms-format-list'. +;; A format routine `forms--format' is built upon startup to format +;; the records according to `forms-format-list'. +;; +;; When a form is changed the record is updated as soon as this form +;; is left. The contents of the form are parsed using information +;; obtained from `forms-format-list', and the fields which are +;; deduced from the form are modified. Fields not shown on the forms +;; retain their original values. The newly formed record then +;; replaces the contents of the old record in `forms--file-buffer'. +;; A parse routine `forms--parser' is built upon startup to parse +;; the records. +;; +;; Two exit functions exist: `forms-exit' and `forms-exit-no-save'. +;; `forms-exit' saves the data to the file, if modified. +;; `forms-exit-no-save` does not. However, if `forms-exit-no-save' +;; is executed and the file buffer has been modified, Emacs will ask +;; questions anyway. +;; +;; Other functions provided by forms mode are: +;; +;; paging (forward, backward) by record +;; jumping (first, last, random number) +;; searching +;; creating and deleting records +;; reverting the form (NOT the file buffer) +;; switching edit <-> view mode v.v. +;; jumping from field to field +;; +;; As an documented side-effect: jumping to the last record in the +;; file (using forms-last-record) will adjust forms--total-records if +;; needed. +;; +;; The forms buffer can be in on eof two modes: edit mode or view +;; mode. View mode is a read-only mode, you cannot modify the +;; contents of the buffer. +;; +;; Edit mode commands: +;; +;; TAB forms-next-field +;; \C-c TAB forms-next-field +;; \C-c < forms-first-record +;; \C-c > forms-last-record +;; \C-c ? describe-mode +;; \C-c \C-k forms-delete-record +;; \C-c \C-q forms-toggle-read-only +;; \C-c \C-o forms-insert-record +;; \C-c \C-l forms-jump-record +;; \C-c \C-n forms-next-record +;; \C-c \C-p forms-prev-record +;; \C-c \C-r forms-search-backward +;; \C-c \C-s forms-search-forward +;; \C-c \C-x forms-exit +;; +;; Read-only mode commands: +;; +;; SPC forms-next-record +;; DEL forms-prev-record +;; ? describe-mode +;; \C-q forms-toggle-read-only +;; l forms-jump-record +;; n forms-next-record +;; p forms-prev-record +;; r forms-search-backward +;; s forms-search-forward +;; x forms-exit +;; +;; Of course, it is also possible to use the \C-c prefix to obtain the +;; same command keys as in edit mode. +;; +;; The following bindings are available, independent of the mode: +;; +;; [next] forms-next-record +;; [prior] forms-prev-record +;; [begin] forms-first-record +;; [end] forms-last-record +;; [S-TAB] forms-prev-field +;; [backtab] forms-prev-field +;; +;; For convenience, TAB is always bound to `forms-next-field', so you +;; don't need the C-c prefix for this command. +;; +;; As mentioned above (see `forms-forms-scroll' and `forms-forms-jump') +;; the bindings of standard functions `scroll-up', `scroll-down', +;; `beginning-of-buffer' and `end-of-buffer' can be locally replaced with +;; forms mode functions next/prev record and first/last +;; record. +;; +;; `local-write-file hook' is defined to save the actual data file +;; instead of the buffer data, `revert-file-hook' is defined to +;; revert a forms to original. ;;; Code: @@ -288,10 +289,10 @@ (provide 'forms) ;;; official (provide 'forms-mode) ;;; for compatibility -(defconst forms-version (substring "$Revision: 2.23 $" 11 -2) +(defconst forms-version (substring "$Revision: 2.24 $" 11 -2) "The version number of forms-mode (as string). The complete RCS id is: - $Id: forms.el,v 2.23 1995/11/16 20:04:57 jvromans Exp kwzh $") + $Id: forms.el,v 2.24 1996/01/04 23:38:16 kwzh Exp erik $") (defvar forms-mode-hooks nil "Hook functions to be run upon entering Forms mode.") |