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authorNorbert Preining <norbert@preining.info>2022-01-24 03:02:10 +0000
committerNorbert Preining <norbert@preining.info>2022-01-24 03:02:10 +0000
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+--------------------------------------------------------------------------
+the CHEMFORMULA package
+
+ typeset chemical compounds and reactions
+
+--------------------------------------------------------------------------
+Clemens Niederberger
+--------------------------------------------------------------------------
+https://github.com/cgnieder/chemformula/
+contact@mychemistry.eu
+--------------------------------------------------------------------------
+If you have any ideas, questions, suggestions or bugs to report, please
+feel free to contact me.
+--------------------------------------------------------------------------
+Copyright 2011--2022 Clemens Niederberger
+
+This work may be distributed and/or modified under the
+conditions of the LaTeX Project Public License, either version 1.3
+of this license or (at your option) any later version.
+The latest version of this license is in
+ http://www.latex-project.org/lppl.txt
+and version 1.3 or later is part of all distributions of LaTeX
+version 2005/12/01 or later.
+
+This work has the LPPL maintenance status `maintained'.
+
+The Current Maintainer of this work is Clemens Niederberger.
+--------------------------------------------------------------------------
+VERSION HISTORY
+2012/01/28 - version 3.0 - bundled with packages `chemmacros' and `ghs'
+2012/01/30 - version 3.0a - bugfix
+ - renamed formula => chemformula
+ (following a request by Karl Berry for TeXlive)
+2012/02/03 - version 3.0b - stepped number with `chemmacros'
+2012/02/05 - version 3.0c - stepped number with `chemmacros'
+2012/02/10 - version 3.0d - several bugfixes
+ - new arrow type <>
+2012/02/19 - version 3.1 - new arrow types -/>, </- and <o>
+ - new commands \DeclareChemArrow, \RenewChemArrow and
+ \ShowChemArrow
+2012/02/26 - version 3.1a - stepped number with `chemmacros'
+2012/03/03 - version 3.1b - arrow types are stored in a sequence to automate the
+ search and replace in the right order
+ - new arrow type ==
+ - IUPAC compliance for stoichiometric factors
+ - new handling of super- and subscripts to correct
+ various flaws: clear distinction between isotope and
+ formula
+ - new option charge-vshift
+2012/03/14 - version 3.1c - improved arrow labels
+2012/03/20 - version 3.2 - new: option input via @{<options>}
+2012/05/07 - version 3.3 - \ch now bypasses \ref{}, \label{}, and \intertext{}
+2012/05/13 - version 3.3a - stepped number with `chemmacros'
+2012/05/18 - version 3.3b - stepped number with `chemmacros'
+2012/05/18 - version 3.3c - stepped number with `chemmacros'
+2012/07/24 - version 3.3d - stepped number with `chemmacros'
+ - default bond length set to 1.1667ex
+ - bug fix in the bonds
+2012/08/21 - version 3.3e - stepped number with `chemmacros'
+2012/09/11 - version 3.4 - cleaned a little, minor bug fixes
+ - switched to internal scratch variables
+ - new command \bond, more bond types
+ - new commands \DeclareChemBond, \DeclareChemBondAlias,
+ \RenewChemBond and \ShowChemBond
+ - radical point thicker, new options `radical-style'
+ and `radical-radius'
+2012/10/03 - version 3.4a - stepped number with `chemmacros'
+2013/01/04 - version 3.4b - bug fix in the sub- and superscript handling
+2013/01/28 - version 3.5 - disallow breaks at bonds
+ - allow breaks after arrows
+ - made some spaces in chemformulas stretch- and
+ shrinkable
+ - various internal code improvements
+ - changed defaults for horizontal spaces that have in
+ set in ex into corresponding values in em.
+ - improvements to the placement of sub- and superscripts
+2013/02/19 - version 3.5a - stepped number with `chemmacros'
+2013/02/26 - version 3.6 - support for use with the `breqn' package
+ - math escaping also via \(\)
+ - internal: clearer escaping macros
+ - new options: `radical-vshift', `radical-hshift'
+ and `radical-space'
+ - bug fix: `radical-...' options are now correctly set
+ - stoichiometric factors: add leading 0 if missing
+ - new option: `stoich-paren-parse'
+ - internal changes: be way more rigid about protected
+ and expandable macros
+ - internal changes: clearer distinction between
+ private macros and accessable module macros
+ - internal changes: clearer distinction between
+ document commands and module level commands
+ - !()() syntax now also works with babel's French
+2013/02/27 - version 3.6a - bug fix: escaped text and math stays escaped, i.e.
+ also arrow code like `<=>'
+2013/04/19 - version 3.6b - new option `arrow-min-length'
+ - bug fix: stoichiometric fractions correctly displayed
+2013/07/06 - version 4.0 - don't need `chemmacros' package any more,
+ `chemformula' can be used stand-alone;
+ this has lead to a few definitions that previously
+ were done by chemmacros; chemmacros will get them
+ now from chemformula when needed
+ - bug fix: allow braces in subscripts and superscripts
+ by disabling superfluous \chemformula_subscript:n
+ and \chemformula_superscript:n in the scripts write
+ commands
+ - remove superfluous rescanning at the begin of the
+ formula input; this is handled by the sanitize
+ command later anyway
+ - changed internal mathshifts from $ ... $ to \( ... \)
+ - removed superfluous \textstyle from math-frac
+ definition
+ - new command \charrow{}[][] that allows direct
+ access to chemformula's arrows
+ - new command \chname()() that allows direct access
+ to chemformula's naming
+ - new command \chcpd[]{} that allows typesetting a
+ simple single formula - also not nestable with \ch
+ - new command \setchemformula
+ - package option: `strict'
+ - don't allow a line break before a plus
+ (`chem-and')
+ - don't allow a line break between a stoichiometric
+ factor and a compound
+ - changed formal charges to match ``plain'' charges
+2013/07/26 - version 4.0a - added options `arrow-penalty' (0), `plus-penalty'
+ (700) and `bond-penalty' (10000) that determine if
+ there may be a break after an arrow, a bond or the
+ plus
+2013/08/24 - version 4.1 - changed `0' values in TikZ coordinates into `0pt'
+ see http://tex.stackexchange.com/q/128792/5049 and
+ http://tex.stackexchange.com/q/118467/5049 for
+ reference
+ - new option `tikz-external-disable'
+ - new option `frac-math-cmd'
+2013/10/24 - version 4.2 - \chemformula_font_inner: is only applied /once/ to
+ a formula, and at the beginning, fixes
+ https://bitbucket.org/cgnieder/chemmacros/issue/23
+ - fixed wrong setting of the TikZ bond style
+ - new option `arrow-style'
+ - new command \chlewis
+2013/11/04 - version 4.2a - bug fix in \chcpd,
+ - change sanitizing/restoring of category codes
+2014/01/24 - version 4.3 - changed behaviour of \DeclareChem to match
+ \DeclareRobustCommand, i.e., no check if command
+ is defined; added a \NewChem variant to each that
+ /does/ check; use \NewChem instead of \DeclareChem
+ for definitions
+ - new option stoich-print
+ - new command \chstoich
+2014/01/29 - version 4.4 - treat a single `-' as a minus sign
+2014/04/07 - version 4.5 - make sure that < and > have catcode 12 when read
+ as parts of arrows
+ - new arrow types `>=<', `>=<<', `>>=<' and `<==>'
+ - arrow lengths and compound offset now correctly
+ adapts to new fontsize if relative lengths (em,ex)
+ are used
+ - allow optional arguments to \\ in equation
+ environments
+ - allow optional arguments to \label in equation
+ environments
+ (credits: http://tex.stackexchange.com/a/166661/5049)
+ - support for Kröger-Vink notation
+2014/06/30 - version 4.6 - fix: a comma in a superscript is typeset according
+ to `decimal-marker' again
+ - fix charge type behaviour: option `circled' and
+ `circletype' are now obeyed if the option is
+ changed mid-document
+ - new option `chemformula/circled' similar to
+ `chemmacros/circled'
+ - new option `chemformula/circletype' similar to
+ `chemmacros/circletype'
+2014/08/04 - version 4.7 - change dependency: pgf library `arrows.meta'
+ instead of `arrows'
+ - new arrow tip definition allows redeclaration to
+ other existing tips by \pgfkeys{cf/.tip=<tip>}
+2014/08/08 - version 4.8 - fix bug introduced in last update: `butt cap' now
+ needs to be `Butt Cap' with the new `arrows.meta'
+ library
+ - split from `chemmacros' bundle as independent
+ package
+2014/10/07 - version 4.9 - new options: `minus-space', `minus-penalty',
+ `plus-output-symbol' and `minus-output-symbol'
+2015/03/16 - version 4.10 - new macros \NewChemCompoundProperty,
+ \RenewChemCompoundProperty,
+ \DeclareChemCompoundProperty,
+ \RemoveChemCompoundProperty
+2015/04/03 - version 4.10a - bug fix in \__chemformula_input_stoich:n
+2015/06/30 - version 4.11 - small changes in \chcpd
+ - remove unnecessary \mathchoice => noticable speed
+ improvement
+ - \NewChemAdditionSymbol
+ - \NewChemSymbol
+2015/08/12 - version 4.12 - remove chemmacros' `circletype' and `circled'
+ options. They really belong to chemmacros
+ - change requirement amsmath -> amstext
+ - shorten definition of double and triple bonds
+2015/08/29 - version 4.12a - \chemformula_formal_plus: ,
+ \chemformula_formal_minus:
+ \ProvideChem... equivalents to all \NewChem...
+ macros
+2015/09/08 - version 4.12b - trim spaces of \ch input -- due to a change in
+ l3kernel
+2015/01/01 - version 4.13 - clean up code
+ - check for blank input
+ - drop support for \[ and \]
+ - new option `atom-format'
+2015/10/21 - version 4.14 - fix issue
+ https://github.com/cgnieder/chemformula/issues/2
+ - new option `adduct-penalty'
+2016/01/07 - version 4.14a - \prop_get:Nn => \prop_item:Nn
+2016/05/03 - version 4.14b - local options now are correctly working again
+ - `atom-format' is only applied to formulas
+2016/05/11 - version 4.15 - arrow definitions don't have to be made in a
+ certain order any more
+ - new quasi equilibria arrows
+ - bug fix in \RenewChemArrow
+ - meaningful error if \charrow if used with an
+ unknown arrow type
+2016/06/08 - version 4.15a - change requirement amstext -> amsmath; \chname
+ uses \underset which needs amsmath
+2016/06/08 - version 4.15b - add missing variant of kernel function
+2016/08/21 - version 4.15c - corrected redundant definition of
+ \chemformula_single_bond:
+ - fix problem with TikZ externalization and
+ Kroeger-Vink notation
+2017/02/02 - version 4.15d - allow `name-format' to end with a macro that
+ takes an argument
+2017/03/23 - version 4.15e - small bug fix (issue #5)
+ - implement \shortintertext bypass
+2019/09/23 - version 4.15f - add missing definition for temporary variable
+2019/09/27 - version 4.15g - bug fix in fontspec option
+2019/10/13 - version 4.15h - new (undocumented) option `set-catcodes'
+ - fix behaviour with category codes
+ (https://tex.stackexchange.com/q/511592/)
+ - fix bug: local format changes are now applied
+ again
+2020/02/01 - version 4.15i - fix issue #12
+2020/03/07 - version 4.15j - make sure that < and > have catcode 12 when read
+ as arrows -- again...
+2020/03/15 - version 4.15k - fix https://tex.stackexchange.com/questions/532674/
+2020/12/22 - version 4.16 - new option `math-scripts'
+ - use LaTeX's new hooks
+ - get rid of unnecessary package dependencies
+2022/01/23 - version 4.17 - adjust options `stoich-print' and `frac-math-cmd'
+ and correct bug in `stoich-print'
+ - deprecate `stoich-print' and introduce `stoich-format'
+ - lazy boolean evaluation where possible
+ - fix deprecated file hook
+ - implement issue #17
+ - fix issue #18
+ - fix issue #19
+ - fix typos in code