140 lines
4.9 KiB
Plaintext
140 lines
4.9 KiB
Plaintext
Give a more helpful error message when the indent is set to a value
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greater than the line-length.
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Tracing. This is a pain to implement because requests are responsible
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for reading their own arguments.
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Possibly implement -s option (stop every N pages). This functionality
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would be more appropriate in a postprocessor.
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Line breaking should be smarter. In particular, it should be possible
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to shrink spaces. Also avoid having a line that's been shrunk a lot
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next to a line that's been stretched a lot. The difficulty is to
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design a mechanism that allows the user complete control over the
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decision of where to break the line.
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Provide a mechanism to control the shape of the rag in non-justified
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text.
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Add a discretionary break escape sequence. \B'...'...'...' like TeX.
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Think about kerning between characters and spaces. (Need to implement
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get_breakpoints and split methods for kern_pair_node class.)
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In troff, if .L > 1 when a diversion is reread in no-fill mode, then
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extra line-spacing is added on. Groff at the moment treats line-spacing
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like vertical spacing and doesn't do this.
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Suppose \(ch comes from a special font S, and that the current font is
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R. Suppose that R contains a hyphen character and that S does not.
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Suppose that the current font is R. Suppose that \(ch is in a word
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and has a non-zero hyphen-type. Then we ought to be able to hyphenate,
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but we won't be able to because we will look for the hyphen only in
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font S and not in font R.
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Variant of tm which doesn't write a newline.
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Perhaps the current input level should be accessible in a number register.
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Should \w deal with a newline like \X?
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Have another look at uses of token::delimiter. Perhaps we need to
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distinguish the case where we want to see if a token could start a
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number, from the case where we want to see if it could occur somewhere
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in a number expression.
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Provide a facility like copy thru in pic.
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Fancier implementation of font families which doesn't group fonts into
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families purely on the basis of their names.
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In the DESC file make the number of fonts optional if they are all on
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one line.
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Number register to give the diversion level.
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Time various alternative implementations of scale (both in font.c and
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number.c). On a sparc it's faster to always do it in floating point.
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Devise a more compact representation for the hyphenation patterns trie.
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Have a per-environment parameter to increase letter-spacing.
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Number register to return character height.
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Number register to return character slant.
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Request to set character height.
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Request to set character slant.
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Provide some way to upcase or downcase strings.
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Support non-uniformly scalable fonts. Perhaps associate a suffix with
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a particular range of sizes. eg
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sizesuffix .display 14-512
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Then is you ask for R at pointsize 16, groff will first look for
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R.display and then R. Probably necessary to be able to specify a
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separate unitwidth for each sizesuffix (eg. for X).
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Request to copy an environment into the current environment.
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Variant of `.it' for which a line interrupted with \c counts as one
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input line.
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Make it possible to suppress hyphenation on a word-by-word basis.
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(Perhaps store hyphenation flags in tfont.)
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Possibly allow multiple simultaneous input line traps.
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Unpaddable, breakable space escape sequence.
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Support hanging punctuation.
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In justified text, if the last line of a paragraph is only a little
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bit short it might be desirable to justify the line. Allow the user
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control over this.
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Have a blank line macro like the end macro. When a blank line macro
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has been set, then a blank line causes the blank line macro to be
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called rather than doing the equivalent of .sp.
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The pm request could print where the macro was defined. Also could
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optionally print the contents of a macro.
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Provide some way to round numbers to multiples of the current
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horizontal or vertical resolution.
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Better string-processing support (substring, length, search).
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Generalized ligatures.
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Provide some way for a macro to tell whether it was called with `'' or
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`.'. This would be useful for implementing a tracing macro package.
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Request to remove an environment. (Maintain a count of the references
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to the environment from the environment table, environment dictionary
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or environment stack.)
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Perhaps in the nr request a leading `-' should only be recognized as a
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decrement when it's at the same input level as the request.
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Don't ever change a charinfo. Create new variants instead and chain
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them together.
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Make it possible to tr characters onto \~.
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Unix troff appears to read the first character of a request name in
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copy mode. Should we do the same?
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Number register giving name of end macro.
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More thorough range checking.
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Provide syntax for octal and hexadecimal numeric constants. Perhaps
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o#100 and x#7f as per Scheme. Or perhaps PostScript 16#7f. Ambiguity
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between whether `c' is treated as digit or scaling indicator.
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Request to return from a macro (ie ignore the rest of the current
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input level).
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