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Change logs of GAMS mode.

Version 6.5 (?)

  • Modified gams-model-library so that it works under the recent versions of GAMS.

  • Added a new function gams-modlib-toggle-show-content to GAMS model library (GAMS-MODLIB) mode. You can see the model library in GAMS-MODLIB mode. In the previous gams-mode.el, GAMS-MODLIB mode shows the program code of models. In the new gams-mode.el, you can see the explanatory text of models like GAMSIDE. Added a customizable variable gams-modlib-show-code-p-default which changes the default behavior of gams-modlib-show-content.

  • Modified explanatory strings.

  • Modified gams-insert-statement-extended.

  • Modified gams-view-document so that you can see documents in recent versions of GAMS system. Added new variables gams-docs-url and gams-docs-view-old and modified the default value of gams-docs-view-program.

  • Changed GAMS mode icon for modeline.

  • Removed gams-auto-complete.el from GAMS mode package. gams-auto-complete.el is renamed to gams-ac.el and released as a separate package in gams-ac repository. []

Version 6.4 (2018-03-22)

  • Added hook variables gams-sil-mode-hook, gams-lxi-mode-hook, and gams-ol-mode-hook.

  • Added new list code gams-auto-complete.el. This enables you to use auto-complete mode in GAMS mode.

    If you want to use auto-complete mode in GAMS mode, you first need to install auto-complete.el which can be installed from MELPA.

    To use auto-complete in GAMS mode, add the following code to init.el.

      ;; Load gams-auto-complete.
      (require 'gams-auto-complete)
      ;; Initial setup for auto-complete in GAMS mode.

    If you want to add words for auto-complete mode by yourself, add words to the variable gams-ac-source-user-keywords-list. See "gams-setting-sample.el" for details.

  • Changed gamslxi.exe.

Version 6.3 (2017-11-18)

  • Modified licence statement.

  • Added executable files gamslxi.exe and gamslxi-import.exe.

Version 6.2.1 (2017-07-02)

  • Remove unnecessary variables and modified obolete functions.

Version 6.2 (2017-03-08)

  • Supported "singleton set".

  • Changed the default value of gams-highlighted-keywords-in-comment to ("TODO" "BUG" "FIXME").

  • Added a customizable variable gams-sil-display-column-num. This variable determiens the column width for displaying identifer name in GAMS-SIL mode.

  • Made changes to show names of parameters, variables and equations with index (set) in GAMS-SIL mode.

Version 6.1.1 (2016-09-23)

  • Added new variable gams-highlighted-keywords-in-comment. In this variable, you specify the list of keywords highlighted even in comment region.

    In comment region, all texts are colored by gams-comment-face. But the words registered in this list are colored by gams-highlighted-keywords-face even in comment region. The default keywords are TODO, BUG, FIXME.

Version 6.1 (2016-03-17)

  • Modified GAMS-TEMPLATE mode.

  • Modified the format of "gams-template.txt" (gams-template-file) which stores templates. The previous gams-template.txt is not compatible with the current GAMS-TEMPLATE mode. You need to recreate the new "gams-template.txt" or replace the old one with the new sample template file.

  • Added gams-temp-change-template-file function.

  • Fixed the bug in GAMS-MODEL library in gnupack Emacs.

Version 6.0 (2016-03-02)

  • Note: Important changes have been added to this version of GAMS mode. Read the explanation below carefully and change your configurations in init.el file.

  • Changed the name of the main lisp code from "gams.el" to "gams-mode.el".

  • The name of feature provided by gams-mode.el changed from gams to gams-mode. So you need to use (require 'gams-mode) instead of (require 'gams).

  • Changed the name of variables and functions whose prefix is "gams*" or "gams:". Now all variables and functions defined in gams-mode.el have prefix "gams-". As a result of this change, names of the following customizable variables changed.

      Old name                         New name
      `gams:process-command-name`   -> `gams-process-command-name`
      `gams:process-command-option` -> `gams-process-command-option`

    You need to modify init.el setting.

  • Change the default value of variables gams-statement-file and gams-template-file.

      gams-statement-file -> "~/.emacs.d/gams-statement.txt"
      gams-template-file -> "~/.emacs.d/gams-template.txt"

Version 5.0 (2016-02-03)

  • Suppose that you have a code like

      $setglobal sub_program sub_program_default.gms
      $include %sub_program%

    With this code, GAMS reads the content of sub_program_default.gms file. But the items in sub_program_default.gms file is not displayed when you evoke gams-show-identifier-list (C-cC-a) because GAMS mode regards %sub_program% as a filename literally and cannot find it.

    In the new GAMS mode, you can list the items in sub_program_default.gms file by adding the following line.

      $setglobal sub_program sub_program_default.gms
      * gams-include-file: sub_program_default.gms
      $include %sub_program%

    The line * gams-include-file: sub_program_default.gms is a comment line and GAMS ignores it. But the GAMS mode interprets that

      $include sub_program_default.gms

    So the items in "sub_program_default.gms" are listed by gams-show-identifier-list.

    The specification by "gams-include-file" is used in the sample file "gams-sample.gms".

  • Fixed the bug (wrong number of arguments) in gams-insert-statement-extended.

  • Removed variable gams-multi-process.

  • Changed the name of function gams-view-docs to gams-view-document.

  • Changed the default value of gams-sil-expand-file-more to t.

Version 4.2 (2013-02-15)

  • Added the new variables gams-outline-regexp-font-lock and gams-level-color-stars-only. With this chage, headlines are colored according to their level.

Version 4.1 (2012-10-13)

  • Fixed minor bugs.

  • Changed the explanation in BUGS_PROBLEMS.txt and README.txt. Until the previous version, I recommended to add the following setting to Emacs

      (setq jit-lock-chunk-size 50000)

    This is for making coloring in GAMS mode work well. But now I recommend the following setting:

      (setq font-lock-support-mode '((gams-mode . nil) (t . jit-lock-mode)))

    This means that font-lock-support-mode is not used in GAMS mode. By this setting, Emacs is likely to slow down when you open GAMS files, but you will encounter less troubles in coloring of GAMS mode.

  • Abolished the command gams-outline-external (and deleted files associated with this command).

Version 4.0 (2012-09-08)

  • Made several changes on GAMS-SIL mode.

    We often include the same file many times in a program. For example, supose that a GAMS program includes the following codes.

      $batinclude aggr vst i r vst_
      $batinclude aggr vtwr i j r s vtwr_
      $batinclude aggr vom g r vom_

    In this code, aggr.gms is included repeatedly. In the previous GAMS-SIL model, the content of aggr.gms is expanded repeatedly in GAMS-SIL buffer. But in the new gams.el, aggr.gms is expanded only once (only first time).

  • Added a new new function gams-sil-toggle-expand-file-more and a lisp variable gams-sil-expand-file-more (the default value is nil).

    In GAMS-SIL mode, the contents of files included by $include commands are usually expanded. For example, if your program includes the following code:

      $include zzz.gms

    then, the content of zzz.gms above is always expanded in GAMS-SIL. However, if the file is included conditionally like

      $if exist xxx.gms $include xxx.gms
      $if %scenario%="bau" $include xxx.gms

    the content of xxx.gms is not expanded by default.

    If you want to expand the content of conditionally inluced files, type "x" in GAMS-SIL buffer. This evokes gams-sil-toggle-expand-file-more command.

    If you always want to expand the content of conditionally inluced files, then set non-nil to the lisp variable gams-sil-expand-file-more.

  • Added the new lisp variable gams-sil-expand-batinclude (default value is t).

    In GAMS-SIL mode, the contents of files included by $include commands are always expanded. But files included by $batinclude are not expanded if gams-sil-expand-batinclude is nil.

  • Changed the default value of gams-special-comment-symbol from "com:" to "@". This is the string to specify the special comment like

      display "@ This is the special comment line";

    The special comment line is used for headlines in GAMS-SIL mode and GAMS-OUTLINE mode.

  • Added outline representation like Org-mode (or outline mode). You can only show headlines of a GAMS program.

    By default, lines starting with *@ are regarded as headlines.

      *@    The top level headline
      *@@   Second level
            text text
      *@@@  Third level
            text text
      *@    Another top level headline

    You can change outline representation by the following two commands:

    • org-cycle (binded to TAB key)
    • org-global-cycle (binded to Shift+TAB key).

    org-cycle command works only on headlines and toggles hide/show the body of programs. org-global-cycle toggles hide/show entire program.

    Open a sample file "org-minor-mode.gms" and try TAB and Shift+TAB.

    This feature uses codes in Org-mode. So if you want to use this feature, Org-mode must be installed (The recent Emacs has Org-mode by default). In addition, note that this command may depend on the version of Org-mode. I test in Org-mode of 7.8.11.

    [How to change symbols for headlines]

    In the default setting, "*@" is used as symbols to represent headlines. This is determined by the lisp variable gams-outline-regexp. This variable specifies the regular expressions of the symbol used to represent headlines and its default value is

      "\\*@+[ \t]"

    If you change the value of this variable, you can change symbols for headlines. For example, add the following expression to your init.el file

      (setq gams-outline-regexp "[ \t]*display \"@+[ \t]")

    And open "org-minor-mode-alt.gms".

    [Other commands for outline handling]

    • "C-cC-:n" -> Move to the next headlines (outline-next-visible-heading).
    • "C-cC-:p" -> Move to the previous headlines (outline-previous-visible-heading).
    • "C-cC-:f" -> Fold the current tree (gams-org-fold-current-tree).
    • "C-cC-:k" -> Show branches (show-branches).
  • Changed the default indent number from 8 to 4.

  • Changed the name of sample setting file from "dot-emacs-sample" to "setting-sample.el".

Version 3.6.6 (2012-06-02)

  • Quited supporting XEmacs because I have no environment for testing XEmacs.

  • Increased the default value of gams-lxi-maximum-line (from 500000 to 1000000).

  • Fixed a bug in gams-show-identifier.

  • Fixed many minor bugs.

Version 3.6.5 (2011-10-15)

  • The previous version (ver.3.6.4) includes a bug in indentation function for $macro block. It is fixed in this version.

  • Fixed the bug related to $oneolcom and $offeolcom. In the previous versions, GAMS mode sometimes does not work well in files with $oneolcom and $offeolcom.

  • Added minor changes on gams-model-library.

Version 3.6.4 (2011-10-05)

  • Added "nonnegative variables" to the GAMS statement list.

  • Changed the key-binding of gams-comment-dwim-inline to C-cM-;.

  • Added minor change on gams-insert-statement-extended (C-cC-n).

  • Supported indentation for $macro definition.

  • Various minor changes.

Version 3.6.3 (2011-06-19)

  • Fixed bugs in gams-show-identifier (C-cC-.).

  • Fixed bugs in the indentation function.

  • Minor changes.

Version 3.6.2 (2011-04-20)

  • Fixed bug in gams-show-identifier (C-cC-.).

  • Many minor changes and bug fix.

Version 3.6.1 (2011-02-02)

  • Fixed bug in gams-show-identifier (C-cC-.).

  • Added minor changes to GAMS-TEMPLATE mode and gams-model-library.

  • Added items to the sample template file "gams-template.txt".

Version 3.6 (2011-01-14)

  • Added the completion listing for gams-show-identifier (C-uC-cC-.).

  • Many minor changes and bug fix.

Version 3.5.2 (2010-11-06)

  • Bug fix for Beta version of GAMS.

Version 3.5.1 (2010-10-14)

  • Bug fix in gams-align-block.

  • Bug fix for ALPHA version of GAMS.

Version 3.5 (2010-09-20)

  • Added the new function gams-align-block (C-cC-y). By this command, you can align table and other blocks in GAMS code. See Section "Align block" in gams-sample.gms for the details.

  • Changed the default value of gams-statement-file from ~/.gams-statement to ~/gams-statement.txt.

  • Changed the default value of gams-template-file from ~/.gams-template to ~/gams-template.txt.

  • Added minor changes to GAMS-TEMPLATE mode.

Version 3.4 (2010-08-09)

  • Abolished the command gams-modlib and added the new command gams-model-library (binded to C-cC-z). This mode enables you to view (and extract) models in the GAMS library.

    To use gams-model-library, you need to set the proper value to the variable gams-system-directory. Note that this command command works only in GAMS of 22.8 or later.

    To extract files from the library, this command uses gamslib.exe. You need to set the proper value to the variable gams-gamslib-command.

  • Changed the default value of gams-use-mpsge to non-nil.

Version 3.3 (2010-07-24)

  • Added many changes to gams-show-identifier-list (C-cC-a) and gams-show-identifier (C-cC-. and F7).

    Now gams-show-identifier-list and gams-show-identifier try to parse the whole gms files (not only the top-level gms file but also subroutine files).

    Folowing this change, variable gams-sid-search-in-subroutine-file is abolished.

  • Added the file variable gams-master-file. For example, suppose that you add the following line in the gms file "included-file.gms",

    • gams-master-file: top-file.gms

    This means that "top-file.gms" is the top level file that includes "included-file.gms". This master file information is used for gams-show-identifier and gams-show-identifier-list commands.

    By setting gams-master-file, you can evoke gams-show-identifier-list and gams-show-identifier from subroutine files. See "include-sample.gms" for the details.

Version 3.2 (2009-12-21)

  • Since gams.el ver. 3.1, you can specify the name and place of the LST file. In addition, gams.el ver 3.2 enables you to specify the LST file directory (the directory where lst files are stored).

    To use this feature, put the following code in your gms file.


      * gams-lst-file: .\listing\sample.lst
      * gams-lst-dir: .\result

    gams-lst-file specifies the name and place of the lst file and gams-lst-dir only specifies the directory for the lst file.

    [Usage of gams-lst-file and gams-lst-dir]

    Exampl 1:

      * gams-lst-file: .\listing\sample.lst

    By this code, the lst file -> .\listing\sample.lst

    Exampl 2:

      * gams-lst-file: c:\sample.lst

    By this code, the lst file -> c:\sample.lst

    Exampl 3:

    Suppose that your gms file is "gams-sample.gms".

      * gams-lst-dir: .\listing\

    Then the above code means that the lst file is ".\listing\gams-sample.lst".

    Example 4:


      * gams-lst-dir: c:\

    This code means that the lst file is "c:\gams-sample.lst".


    1. You can use both full path and relative path to specify the LST file and directory.

    2. This function does not support file and directory name with spaces. It is because `o=' option of GAMS does not support such file name.

    3. If gams-lst-file and gams-lst-dir are not set, gams-mode assumes that the LST file has the same name as GMS file and is placed at the same directory as the GMS file.

    4. If both gams-lst-file and gams-lst-dir are set, the former overrides the latter.

    5. If you want to put the LST file in another directory, that directory must be created bofore you run gams.

    6. The lst file set by gams-lst-file or gams-lst-dir is overwritten with the one determined by o= setting in *#! notation.

  • Added the new variable gams-lst-dir-default. If you always want to save all lst files in a specific directory, set the directory to this variable.

    For example, the following code implies that all lst files are saved in the subdirectory "lst" under the current directory:

      (setq gams-lst-dir-default ".\\lst\\")

    Similarly, the following code implies that all lst files are saved in the directory "c:\lst".

      (setq gams-lst-dir-default "c:\\lst\\")

    If you set nil to this variable (the default setting), lst files are saved in the current directory.

    Note: If gams-lst-file or gams-lst-dir are set in a GMS file, the specification of the variable gams-lst-dir-default is overwritten.

Version 3.1.1 (2009-10-11)

  • Fixed bugs in coloring and gams-show-identifier.

  • Added "gams-sample-ja.gms" for Japanese users.

Version 3.1 (2009-08-03)

  • A new feature: To move from the GMS file to the corresponding LST file, the previous gam-mode premises that both files have the same name (expect for the extension) and are placed in the same directory. In the new gams-mode, you can use the different name for the LST file and put it in the different directory.

    For example, if you want to let "sample.lst" be the name of the LST and and put it in the subdirectory listing. Then, add the following code somewhere in the gms file:

      * gams-lst-file: .\listing\sample.lst

    This code has two effects:

    1. gams is executed with option o=.\listing\sample.lst

    2. You can switch from the gms file to .\listing\sample.lst by C-cC-v (or F10).


    1. To specify the LST file, use the relative path and do not use absolute (full) path.

    2. This function does not support file and directory name with spaces.

    3. If gams-lst-file is not set, gams-mode assumes that the LST file has the same name and is placed at the same directory as the GMS file.

    4. If you want to put the LST file in another directory, that directory must be created bofore you run gams.

    5. The lst file set by gams-lst-file is overwritten with the one determined by o= setting in *#! notation.

  • The default key-binding for gams-show-identifier is changed from C-c.. to C-cC-..

  • Added the more explanation on *#! notation to gams-sample.gms. *#! notation is a way for changing a command line easily (this is a function like #!/usr/bin/perl or #!/bin/sh for shell scripts). For the details, see gams-sample.gms file.

Version 3.0 (2009-07-19)

  • Added the new mode called GAMS-LXI mode. This mode provides a function that resembles the GAMSIDE listing function. For the details, see /lxi/gams-lxi-sample.gms file.

    Note: To implement GAMS-LXI mode, the following code is added to gams.el.

      (add-to-list 'warning-suppress-types '(undo discard-info))

    This code might cause some problems.

  • Minor change on gams-start-menu.

  • The value of truncate-lines in GAMS-LST mode changes from nil to t. This means that continuation lines are not displayed in GAMS-LST mode. If you like the old behavior, use the following hook setting:

      (add-hook 'gams-lst-mode-hook
                '(lambda ()
                   (setq truncate-lines nil)
  • Minor change on gams-show-identifier-list (the command evoked by C-cC-a). $prod, $demand and $constraint blocks in MPS/GE are displayed in GAMS-SIL mode.

  • Added the new command gams-lst-file-summary in GAMS-LST mode (the default key-binding is ".").

Version 2.7.1 (2009-03-13)

  • Fixed the bug related to GAMS process.

Version 2.7 (2009-03-10)

  • Changed the default value of gams-recenter-font-lock to t (you can recolor the block around the cursor by C-l).

  • Fixed the bug in coloring.

  • The new gams.el displays last modification time of LST file in the minibuffer when you move from GMS file to LST.

  • The previous gams.el cannot handle multi-character inline and end-of-line comment symbols like /*, */ //. In the new gams.el, you can use multi-character comment symbols. In addition, the default inline comment symbols are changed to /* and */.

      (setq gams-inlinecom-symbol-start-default "/*")
      (setq gams-inlinecom-symbol-end-default "*/")
  • Function gams-lst-jump-to-input-file (key i in GAMS-LST mode) in the previous gams.el often fails when an input file name includes spaces. The new gams.el fixed this bug.

  • Added function gams-lst-next-elt, gams-lst-previous-elt, gams-lst-next-clt, gams-lst-previous-clt in GAMS-LST mode (the default keybindins are x and c). By these commands, you can move to Equation Listing and Column Listing part in the LST file.

  • Bug fix for the pretest version of Emacs23 (Emacs 23.0.9x). The GAMS-OUTLINE mode in the previous gams.el does not work well in pretest version of Emacs 23.

  • In the new Emacs (ver 23.0.9), the default value of comment-style changed from plain to indent. By this change, gams-comment-region (and comment-region) command fails. To avoid this, please set plain to comment-style as the old Emacs:

    (setq comment-style 'plain)

  • Added function gams-report-bug. This command outputs information for debugging GAMS mode. This command must be executed in a GAMS mode buffer.

Version 2.6.1 (2009-01-07)

  • Fixed the bug in coloring.

  • gams-show-identifier-list now displays identifers defined by table.

  • GAMS-OUTLINE mode in the previous versions has a serious bug. This bug is fixed in the new version.

  • The new gams.el can handle a file name with spaces like "foo bar 1.gms".

Version 2.6 (2008-12-20)

  • Added the new function gams-ol-toggle-display-style which is binded to x in the GAMS-OUTLINE mode. By this command, you can toggle the display style (vertical or horizontal style) in the GAMS-OUTLINE mode. If you have a wide display, you had better select the horizontal style where two (or three) windows are arrayed horizontally.

    The default style is determined by the variable gams-ol-display-style. The width of the left column in the horizontal style is determined by the variable gams-ol-width.

  • Added the new variable gams-process-log-to-file (the default value is nil). If you set non-nil to this variable, GAMS log is written to the log file even without lo=2 option. GAMS log in this context means the content of GAMS process buffer. The extention of log file is determined by the variable gams-log-file-extension ("glg" by default).

  • Added gams-toggle-hide/show-comment-lines, which is binded to C-cC-h. This command enables you to hide (or show) all comment lines (lines started with * and lines enclosed by $ontext-$offtext pair) in the buffer. Note that this command only hide lines and makes no modification to the buffer.

  • The GAMS-OUTLINE mode displays more items (for example, Compilation, Include File Summary etc.). The new GAMS-OUTLINE mode is not compatible with the old one. So, please delete the following part in ~/.gams-statement" if it exist:

      (setq gams-user-outline-item-alist '(

    In addition, please change the setting for the variable gams-ol-view-item.

  • Fixed the bug in gams-show-identifier.

  • Fixed the error in the sample template file ".gams-template".

  • Fixed the bug in font-lock (coloring) for gams mode.

  • A minor change to gams-show-identifier-list.

  • Changed GAMS-SIL mode. Explanatory text for equations in equation declaration part (EQU part) is displayed also in equation definition part (DEF part). Similarly, explanatory text for model in model declaration part (MOD part) is displayed also in solve statement part (SOL part).

  • Added the function gams-change-gams-command. You can change GAMS command name in the process menu as you can change gams commad line option. Try C-cC-tc. The registered GAMS command name is stored in the file determined by gams-statement-file.

  • Changed gams-show-identifier. Now, you can extract (copy) the explanatory text from the identifier declaration part. Try C-c.. and type e.

Version 2.5 (Sat Mar 29, 2008)

  • Added the new variable gams-docs-directory. This variable determines the GAMS document directory. By default, it is set to gams-system-directory + docs."

  • Fixed bugs in the function gams-view-docs.

Version 2.4 (Wed Jul 19, 2006)

  • Modified the indentation function. The new gams mode makes cleverer indentation.

  • Supported Emacs 22. Now, you can use gams.el in Emacs22.

Version 2.3 (Sat Nov 5, 2005)

  • Fixed bugs for XEmacs.

  • Fixed bug in GAMS-OUTLINE mode.

Version 2.2 (Sun Sep 4, 2005)

  • Fixed bugs in coloring of MPSGE block.

  • Fixed bug in gams-insert-statement-extended. Now, gams-insert-statement-extended works well also in the case that gams-statement-upcase is non-nil.

Version 2.1 (Fri Nov 5, 2004)

  • Added the new function gams-show-identifier-list (binded to C-cC-a by default. This command displays the list of all GAMS identifers existing in the gms buffer.

  • Abolished the variable gams-docs-dir. You must assign a proper value to gams-system-directory if you want to use gams-view-docs. gams-view-docs does not work in some versions of GAMS.

  • Added the new variable gams-special-comment-symbol (default is "com:").

  • Fixed bugs in gams-lst-jump-to-error-file.

  • Fixed many bugs in coloring.

Version 2.0 (Tue Sep 9, 2003)

  • Abolished the command gams-show-identifier-defintion (C-c.) and added the new function gams-show-identifie. Try "C-cC-." and "C-uC-cC-." in GAMS mode. See also "gams-sample.gms".

  • Added the new command gams-insert-statement-extended. Try "C-cC-n" in GAMS mode.

  • Exchange the role of "l" key and that of "L" key in GAMS-LST mode.

  • Changed indentation pattern. If you want to use the previous type of indentation, set t to the variable gams-indent-more-indent.

    If gams-indent-more-indent is nil, the following indentation is realized.

          i   Sector index / agr, man1, man2, ser /,
          f   Primary factor index
          / cap, lab, lan /
          c   Commodity index /
          agr, man, ser /;

    On the other hande, if gams-indent-more-indent is t,

          i   Sector index / agr, man1, man2, ser /,
          f   Primary factor index
              / cap, lab, lan /
          c   Commodity index /
              agr, man, ser /;
  • Changed some keybindins. See gams-refcard.pdf.

Version 1.10 (Sun Feb 16, 2003)

  • Added the new function gams-comment-region (C-cC-;). This function is an alias for comment-region. Select an region and type C-cC-;, then you can comment out it. You can also uncomment the commented-out region by attaching the universal argument like (C-uC-cC-;).

  • Added the new function gams-replace-statement which replaces the existing statements or dollar control options with the new one. If you execute this command on the existing GAMS statements or dollar control options, you can replace them with the new onew. To execute this command, attach the universal argument to C-cC-k and C-cC-d (i.e. C-uC-cC-k, C-uC-cC-d).

  • Added the new function gams-ol-refresh (binded to r in GAMS-OUTLINE mode). Refresh the GAMS-OL buffer if the LST file is updated.

  • Modified gams-insert-parens. In the previous version, typing ( inserted a pair of parenthesis if gams-close-paren-always is non-nil. Now, if you attach the prefix argument to ( [i.e. typing C-u (], just insert (.

  • Added the new variable gams-ol-item-name-width (its default value is 18). The width of item name field in GAMS-OUTLINE.

  • Modified display in GAMS-OUTLINE mode.

Version 1.9 (Tue Jan 14, 2003)

  • Added the new variable gams-sd-included-file (its default value is t). If this variable is assigned non-nil, gams-show-identifier-defintion searches the identifier definition also in the files included through $include or $batinclude. If nil, search the identifier definition only in the current file."

  • Fixed the bug in coloring.

  • Fixed the bug in gams-show-identifier-defintion.

Version 1.8 (Sat Dec 7, 2002)

  • Added the new function gams-open-included-file (binded C-cC-w). If you execute this command on the file name after $include or $batinclude, you can open the included file.

  • Added the new function gams-goto-matched-paren (binded to F8). This command is the same as F8 in GAMSIDE and you can jump to the matched parenthesis. This command is vaild only if the cursor is on the parenthesis.

    The position of the cursor where this command is valid (e.g)

    (a + b + c + d * f * h) ^ ^ Here and here

    Note that with respect to the right parenthesis ), the cursor should be placed at the next point after the ).

  • Fixed the bug in gams-ol-view-next. Until the previous, in Emacs 20 and XEmacs, the gams-ol-view-next (binded to N by default) sometimes doesn't work properly in GAMS-OUTLINE buffer: a window doesn't scroll if you type N on the last line of the window. I fixed this bug for Emacs 20. But XEmacs still has this bug.

  • Added the new function gams-show-identifier-defintion (binded to F7 and C-c. by default).

    While you are reading or editing a GAMS program, you may often go back to the declaration part of an identifier so as to see its definition. In such a case, you could use, for example, isearch-backward command or something. But if the identifier is used many times at the different parts of the program, it is difficult to find the declaration part of the identifier.

    This command enables you to see the declaration part of the identifier under the cursor. See "gams-sample.gms" file about how this command is used. The new face gams-highline-face is also added.

  • Added the new function gams-outline-external (binded to O in GAMS-LST mode).

    When a LST file is very large, it often takes much time to start GAMS-OUTLINE mode. In stead of the lisp code, this command uses the external program to create GAMS-OUTLINE buffer.

    When a LST file is large, this command may take much less time than gams-outline. Generally,

    Small LST files => gams-outline is a little faster. Large LST files => gams-outline-external is faster.

    But it depends on the type of LST files. gams-outline may be faster than gams-outline-external even for large LST files. If you are satisfied with the speed of GAMS-OUTLINE mode, you need not use this command. Just use gams-outline.

    As the external program, you can use the C program (gamsolc.exe) or the Perl script ( The C program works faster than the Perl script, but the C program is offered only for MS windows (I cannot compile the program with gcc on Unix). The Perl script works both on MS windows and Unix systems as long as Perl5 is installed in that system. If you are MS windows user, use gamsolc.exe. If you are Unix user, use

    To use this command, you need to set the proper values to the variable gams-ol-external-program. If you use the Perl script, gams-perl-command also must be assign the value (the default values of two variables above are set to nil). See the help discription of these variables. Moreover, gamsolc.exe or must be placed at the proper place.

  • Fixed the various bugs of codes for XEmacs (thanks to H. Kremers). Now, the full coloring works also on XEmacs. But generally speaking this program is likely to work better on GNU Emacs.

  • Fixed various minor bugs.

Version 1.7 (Tue Oct 22, 2002)

  • Binded gams*start-processor to C-cC-s and F9. Now, you can run gams by typing these keys.

  • Added the new function gams-from-gms-to-outline (binded to C-cC-i and F10 by default). With this command, you can jump directly to the OUTLINE buffer from gms file buffer.

  • Added the new function gams-from-outline-to-gms (binded to ; by default). With this command, you can jump directly to the gms file buffer from the OUTLINE buffer.

  • Fixed the bugs in automatic indent.

  • Added the new variable gams-always-popup-process-buffer (its default value is t) and the new function gams-popup-process-buffer (binded to C-cC-l by default). If gams-always-popup-process-buffer is assigned nil, the process buffer does not popup. gams-popup-process-buffer makes the process buffer popup.

  • Changed the default value of gams-template-cont-color to nil. Non-nil makes the program very slow. If you want to make the template content buffer colored, set it by yourself.

  • If you are an Emacs21 user, please set gams-display-small-logo to t. Something may happen on the modeline :-)

  • Supported XEmacs. But it is incomplete in the following aspects.

    1. I do not support the level 2 coloring (e.g., no color on explanatory text etc.). So, even if you select the level 2 coloring with gams-choose-font-lock-level, the coloring level is 1.

    2. Many commands may not work on XEmacs. As far as I know, gams-comment-dwim, gams-comment-dwim-inline do not work.

    I tested the program only with XEmacs 21.4 on MS windows.

  • Fixed the bug in GAMS-TEMPLATE mode.

Version 1.6 (Sat Sep 7, 2002)

  • Modified gams-comment-dwim and gams-comment-dwim-inline (M-; and C-; respectively). Now, you can select the position of end-of-line and inline comment when you insert them.

  • Until the previous version, coloring doesn't work when you edit already written set elements in a slash pair. I modified the program so that coloring works in such a situation.

  • Changed key-bindings.

    Emacs Lisp Manual says

"The key sequences bound in a major mode keymap should usually start with C-c, followed by a control character, a digit, or {, }, <, >, : or ;. The other punctuation characters are reserved for minor modes, and ordinary letters are reserved for users.".

The previous key-bindings in GAMS mode are against this rule. So, I have changed the default key-bindings. In the new key-bindings, I attached C- (control key) to the old ones.

For example,

Old binding       New binding

C-ck      =>  C-cC-k
C-cd      =>  C-cC-d
C-ce      =>  C-cC-e

If you don't like these key-bindings, please change them by yourself. Key-bindings in other modes remain the same. Please see the help in each mode or see the refcard "refcard-gams.pdf".

  • Added the new variable gams-indent-number-equation.

  • Fixed the bug in "dot-emacs-sample". Until the previous version, (require 'gams) is located at the beginning of "dot-emacs-sample". But some of settings are not valid if they are located after (require 'gams). So, if you use (require 'gams) in ".emacs.el", you must put it at the end of all GAMS settings. But I recommend autoload rather than require. See the new "dot-emacs-sample".

  • Fixed the bug in gams-ol-mark.

  • Changed the default value of gams-docs-view-program to "c:/Program Files/Adobe/Acrobat 5.0/Reader/AcroRd32.exe".

  • Changed the default coloring.

  • Fixed various minor bugs.

Version 1.5 (Fri Aug 23, 2002)

  • Modified gams-font-lock-keywords-1 and gams-font-lock-keywords-2.

  • Until the version 1.4, the automatic indent has many bugs and does not work well in various situations. It is mainly because my rule and program for indent are ad-hoc. In this version, I have modifed the large part of codes for automatic indent. New codes may include (new) bugs, but they will generally work better than old ones.

    In the new indent rule, a line is indented properly only if the previous lines are already indented properly.

  • Added the refcard.

Version 1.4 (Mon Aug 5, 2002)

  • Added the new function gams-insert-on-off-text which is binded to C-cc by default. This command inserts an ontext-offtext pair. If you attach universal-argument, this encloses the specified region with an ontext-offtext pair.

  • Added the new face gams-title-face.

  • Fixed the bugs in gams-comment-dwim and gams-comment-dwim-inline.

  • Fixed bugs in automatic indentation and coloring. Thanks to Marko Loparik.

  • Added the new variable gams-indent-equation-on Non-nil means indent equation blocks. If nil, already written equations are not affected by TAB. Its default value is t.

  • The values of gams-inlinecom-symbol-start-default, gams-inlinecom-symbol-end-default, and gams-eolcom-symbol-default are used as default inline and end-of-line comment symbols The default values of these variables are "{", "}", "!" respectively.

  • If $inlinecom or $eolcom do not exists in the file, gams-comment-dwim and gams-comment-dwim-inline insert their default values determined by the variables gams-inlinecom-symbol-start-default, gams-inlinecom-symbol-end-default, and gams-eolcom-symbol-default. If you attach the universal argument when executing gams-comment-dwim and gams-comment-dwim-inline, you are asked which symbol to be inserted.

  • Added the new function gams-ol-item binded to T in GAMS-OUTLINE mode. You can select viewable item combination from registered list. You can register a new item combination in GAMS-ITEM-SELECT mode (gams-ol-select-item).

  • Added the new function gams-ol-select-quit and gams-ol-select-select in GAMS-ITEM-SELECT mode.

  • Fixed the bug in automatic indentation.

Version 1.3.1 (Sun Apr 14, 2002)

  • Fixed the bug in GAMS-OUTLINE mode. Now, the values of REPORT SUMMARY field are displayed correctly.

  • Modified gams-calculate-indent-decl. Indentation rule for declaration type block is modified.

  • Fixed the bug in colorization for inline and eol comments.

  • Fixed the bug in colorization for explanatory text.

Version 1.3 (Mon Apr 1, 2002)

  • Supported automatic indentation. You can indent GAMS program according to GAMS syntax.

    As in most major modes in Emacs, the indent-line function (gams-indent-line) is binded to TAB key. By typing TAB key, you can indent the current line. To indent whole lines in a region, use M-C-
    (indent-region). When you type RET and make a new line, indent is automatically inserted (gams-newline-and-indent).

    If you want to use TAB key to insert TAB itself and bind gams-indent-line to another key, put the following setting in your "~/.emacs.el".

      (add-hook 'gams-mode-hook
              '(lambda ()
               (let ((map gams-mode-map))
                (define-key map [f2] 'gams-indent-line)
                (define-key map "\t" 'gams-insert-tab))))

    In this example, gams-indent-line is binded to F2 key and the command for inserting TAB (gams-insert-tab) is binded to TAB key.

    Automatic indentation is off in the following cases: (i) In table blocks. Since in table blocks format matters, I make indentation off there. (ii) In a ontext-offtext pair. (iii) For already written equations in normal part (not in equations block).

    Four new customizable variables for indentation are added. gams-indent-on, gams-indent-number, gams-indent-number-loop and gams-indent-number-mpsge. If you want to make automatic indentation off, set gams-indent-on to nil. Its default value is of course t :-)

    Although I have tested indentation in several GMS files, it is likely not to work in various cases. If you encounter odd behaviors of automatic indentation, please let me know it and send me an example program in which indentation does not work well.

    To make automatic indentation in GAMS mode work well, please end a reserved word block (e.g. parameter, table, set blocks etc.) with a semicolon (;) although it may not be necessarily required in GAMS syntax.

    I am a beginner of GAMS and don't know proper programming style in GAMS. So indentation rule is determined mainly by my tastes. If you have suggestions or requests for indentation rule, please let me know it!

  • Added the new customizable variable gams-insert-dollar-control-on. Until the previous version, $ key is binded to executing gams-insert-dollar-control. But now $ key is binded to inserting $ itself by default. If you want to use $ key to execute gams-insert-dollar-control, set this variable to non-nil.

  • Supported the rich coloring like GAMSIDE. Newly introduced customizable faces are gams-string-face, gams-slash-face, gams-operator-face, gams-explanation-face, gams-oth-cont-face. If you encounter odd behaviors of coloring, please let me know them with an example GAMS program in which coloring does not work well. I'll fix them. For Emacs 21 users, please read BUGS file.

  • Speed up coloring in GAMS mode! Now, coloring (font-lock) requires much less time in GAMS mode. In the previous version of gams.el, coloring requires extra time because of my silly mistake in the program :-)

  • Added the new function gams-choose-font-lock-level. This command changes the font-lock (coloring) level in GAMS, GAMS-LST, GAMS-OUTLINE modes. By default, it is binded to C-cf in all three modes. GAMS program files or LST files are often very large and font-lock requires much time to color such big files. So before you open a big file, you had better change the font-lock level by this command. The number of levels is three: 0, 1, and 2: 0 means no color (font-lock-mode is off), 1 means minimum color, and 2 means maximum color. If you want to open a big file, you had better set the font-lock level to 0. The default font-lock level in each mode is determined by the value of customizable variables gams-font-lock-level, gams-lst-font-lock-level, and gams-ol-font-lock-level. All default values are 2 (maximum).

  • Supported font-lock-fontify-block (binded to M-gM-g). With this command, you can re-color a part around the cursor (not an entire buffer).

  • Added the new variable gams-mode-load-hook. The content of this hook variable is run after "gams.el" is loaded.

  • Changed gams-outline to make GAMS-OUTLINE mode faster.

  • Added the new variable gams-system-directory.

  • Added the new function gams-modlib (binded to C-cz). With this command, you can extract a model from GAMS model library. To use this, you must set the GAMS system directory to the variable gams-system-directory.

  • Added the new function gams-option which is evoked through gams-start-menu (C-ct). By selecting "Change option" in the process start menu, you can change and register several combinations of options. Registered option combinations are stored in the file gams-statement-file.

  • Fixed the typo in "dot-emacs-sample". Thanks to Steven Dirkse.

  • Modified GAMS-OUTLINE mode so that the values of items in REPORT SUMMARY (NONOPT, INFEASIBLE, etc.) are displayed.

  • Modified GAMS-OUTLINE mode coloring for SOLVER STATUS and REPORT SUMMARY. I assume that 1, 2, and 8 of the value of MODEL STATUS mean no error (I am not sure whether this is appropriate or not). If SOLVER STATUS and REPORT SUMMARY parts indicate some errors, they are colored.

  • Fixed the bug in coloring for copied program listing in GAMS-LST mode.

  • Thanks to Marko Loparik for his bug reports and suggestions.

  • Fixed the bugs in coloring of GAMS-LST mode and added new coloring.

  • Modified gams-insert-single-quotation. Until the previous version, this command inserts "'" ifgams-close-single-quotation-alwaysis non-nil. The new one inserts "''". The default value ofgams-close-single-quotation-always` has changed to nil.

  • Added new functions gams-comment-dwim and gams-comment-dwim-inline (binded to M-; and C-; respectively). With these commands, you can easily insert end-of-line or inline comments. The end-of-line and inline comment symbols are determined by $eolcom and $inlinecom dollar control options in the file. If comment symbols have already been specified in the file, they are used for these two commands. Otherwise, you will be asked which comment symbols to use and $eolcon or $inlinecom will be inserted at the first line in the file automatically. In MPSGE block, "!" is always used as the end-of-line comment symbol. The default comment symbols are determined by the variables gams-inlinecom-symbol-start-default, gams-inlinecom-symbol-end-default, and gams-eolcom-symbol-default. The default values of these variables are "{", "}", "!" respectively. There is one more new variable gams-comment-column.

  • Added the new variable gams-template-cont-color. If this variable is assigned non-nil, the Template Content buffer is colorized. The default value is t. If you set nil to this variable, TEMPLATE mode works faster.

  • Fixed various minor bugs.

Version 1.2 (Tue Feb 5, 2002)

  • Added new functions gams-ol-widen-one-line and gams-ol-narrow-one-line (binded to o and l respectively). These commands change the widow height in GAMS-OUTLINE mode.

  • Added a new function gams-comment-on-off-text (binded to C-cC). When this command is executed on a $ontext ($offtext), both $ontext $offtext are commented out (or uncommented out if they are already commented out).

  • Added a new function gams-remove-on-off-text (binded to C-cG). When this command is executed on a $ontext ($offtext), both $ontext ($offtext) and the corresponding $offtext ($ontext) are removed.

  • Changed the default value of gams-recenter-font-lock to nil because it takes much time to recenter a relatively large buffer.

  • Supported comment prefix other than *. If you use $comment control to set your own comment prefix, it is automatically used in GAMS mode. But a comment prefix other than * may not be recommended (?)

  • Fixed the bug of font-lock in GAMS. Until the previous version, the ontext-offtext region which includes dollar mark is not colored in Emacs 20. Now, such a region can be colored both in Emacs 20 and 21.

  • Fixed the typo in dot-emacs-sample file. Thanks to C. Starkweather.

  • Several minor changes.

Version 1.1 (Sun Jan 20, 2002)

  • The name of GAMS-OVERVIEW mode is changed to GAMS-OUTLINE mode. overview or ov in the names of functions and variables are changed to outline or ol respectively.

    For example, gams-overview => gams-outline. gams-ov-height => gams-ol-height.

    Especially, take care of the customizable variables such as gams-ol-height, gams-ol-height-two, gams-ol-view-item.

  • Supported customize. You can change the values of customizable variables in GAMS mode by customize command. Try to type M-x customize-apropos-groups [RET], gams [RET].

  • Added the original faces for GAMS mode. If you want to change default faces, use custom-set-faces (see "dot-emacs-sample" file) or M-x customize-face.

  • Added the new function gams-view-docs (binded to C-cm by default) which enables you to view GAMS pdf manuals from Emacs. Set proper values to the customizable variables gams-docs-dir and gams-docs-view-program.

  • Added the new function gams-jump-on-off-text (binded to C-cg by default). If you execute this command on $ontext ($offtext), then you jump to the corresponding $offtext ($ontext).

  • Supported menu. Useless?

  • The author's email address is changed from to

Version 1.08 (Mon Dec 3, 2001)

  • Sorry, but I changed the name of the program from "gams-mode.el" to "gams.el" again. It is because the name "gams-mode.el" is already used in the lisp written by Winston C. Yang ( or

  • Added the GAMS-OVERVIEW mode. Newly added custumizable variables are gams-ov-height, gams-ov-height-two, and gams-ov-view-item.

  • Changed a lot of default keybindings in the GAMS-LST mode so that similar keybindings are applied to both the LST and OVERVIEW mode. See the help in both modes for keybindings.

  • Added the variable gams-recenter-font-lock. Non-nil means font-lock again with recentering. If your computer is slow, you had better set this to nil.

  • Changed the default values of gams-statement-upcase and gams-dollar-control-upcase to nil.

  • Changed the regular expression for gams-font-lock-keywords.

  • Fixed various minor bugs.

  • Modified the "dot-emacs-sample" file. Thanks to Steven Dirkse.

Version 1.07.1 (Tue Oct 23, 2001)

  • Changed the name of the program from "gams.el" to "gams-mode.el".

  • Fixed the bug of gams-fill-paragraph reported by Collin Starkweather.

  • Fixed the bug of gams-view-lst and gams-jump-to-lst.

Version 1.07 (Mon Sep 24, 2001)

  • Added Easy templates handling (GAMS-TEMPLATE). gams-template binded to C-ce by default.

  • Multi processes. Until ver 1.06, you can run only one process of GAMS in an Emacs. But from this version, you can run multiple GAMS processes simultaneously if you set a variable gams-multi-process to non-nil.

  • Added gams-indent-line-function.

Version 1.06 (Thu Sep 13, 2001)

  • Made a little change on the functions gams-insert-statement and gams-insert-dollar-control.

  • TAB key is binded to inserting TAB.

  • Fixed various bugs.

Version 1.05 (Mon Sep 3, 2001)

  • Added a variable gams-file-extension. This variable is a list of extensions of files in which GAMS mode starts automatically.

  • Changed the setting in .emacs. Now you don't need to set auto-mode-alist and autoload in .emacs. Just write (load "gams"). See the file emacs-sample.

  • Corrected many typos and misspelling.

  • Fixed various minor bugs.

  • Fixed the bug in gams-insert-dollar-control.

Version 1.04 (Sat Sep 1, 2001)

  • Added a new function gams-lst-jump-to-error-file binded to g which was previously binded to gams-lst-view-gms. Now you can jump to error places in included files inserted by, for example, $libinclude or $batiinclude statements.

  • Added font-lock (colorization) to GAMS-LST mode so that keyword VAR, PARAMETER etc. are colorized.

Version 1.03 (Sat Aug 25, 2001)

  • Made a process window not disappear.

  • Made a little change on gams-start-menu.

  • Add a function gams-insert-comment and a variable gams-user-comment to insert user defined comment template.

  • Set the auto-fill-mode off by default.

Version 1.02 (Thu Aug 23, 2001)

  • Fixed the bug in gams-insert-parens reported by Steven Dirkse.

  • Fixed other various bugs.

  • Added a variable gams-statement-regexp-default for font locking (colorization).

  • Changed the default value of gams:process-command-option.

  • Added a variable gams-use-mpsge.

Version 1.01 (Tue Aug 21, 2001)

  • Fixed the bug reported by Tor-Martin Tveit and Steven Dirkse.

  • Changed gams-insert-statement and gams-insert-dollar-control.

  • More items added to gams-statement-up by Steven Dirkse.

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