At 2023-02-21T22:58:35+1100, John Gardner wrote: > > If I could do something like the following: > > > > .if \n[.mandoc] .als MR IR > > > > To determine if mandoc(1) is being used to format the current page, > use > > .if \n(.f=0
John, THANK YOU! YOU HAVE SAVED MY BACON! > This is what Mono.tmac > <https://github.com/Alhadis/Mono/blob/25765171fbf676b623a4bcbf3d9f93384ef83040/ono.tmac#L6> > uses to identify mandoc(1), and it works quite well: no full Troff > implementation will mount a font at a position of zero, ...by default, yes. groff at least will happily let you stick them there... $ groff .fp 0 HR .ft 0 .tm font=\n[.fn] font=HR ...but negative font positions are not allowed. $ ./build/test-groff .fp -1 HR troff:<standard input>:1: error: negative font position However, this is close enough. I think it will prove a practical heuristic for mandoc detection. No man page should be mucking about with the font mounting positions, or even referring to them: doing so is not portable.[1] > and mandoc(1) has absolutely no concept of mounting fonts, period. Right. Here is the new MR fallback code (to be inlined into every groff man page), and it works just fine with mandoc(1) (1.14.5), groff 1.22.4, and groff Git HEAD. It also doesn't try to be nearly as clever as my implementation of 3 February (defining a macro within a macro--I should have known better: I am not Tadziu Hoffman). .\" Define fallback for groff 1.23's MR macro if the system lacks it. .nr do-fallback 0 .if !\n(.f .nr do-fallback 1 \" mandoc .if \n(.g .if !d MR .nr do-fallback 1 \" older groff .if !\n(.g .nr do-fallback 1 \" non-groff *roff .if \n[do-fallback] \{\ . de MR . ie \\n(.$=1 \ . I \%\\$1 . el \ . IR \%\\$1 (\\$2)\\$3 . . .\} .rr do-fallback So, after being cross with Ingo for resisting my revolutionary initiatives, I would just as much like to thank him (and Kristaps Dzonsons) for implementing _enough_ *roff in mandoc(1) to make the above possible. mandoc -Tlint doesn't even screech about it! (It does about other things in the page.[2]) Thank you again, John--that bit of insight is a _huge_ help. Hyrum's Law wins again! Regards, Branden [1] I mean this in an even stronger sense than "is a groffism"--which it isn't. Even back in 1980s "ditroff" days, the default font mounting positions were determined by the DESC file, which were user- [well, administrator-]modifiable. If your site had a house preference for Helvetica over Times, for example, and had dutifully paid your font licensing fees, why _wouldn't_ you update the DESC files accordingly? [2] mandoc -Tlint output: mandoc: build/tmac/groff_man_style.7:33:2: UNSUPP: unsupported roff request: do mandoc: build/tmac/groff_man_style.7:3646:3: WARNING: unknown font, skipping request: TS fCB lfCB. mandoc: build/tmac/groff_man_style.7:3646:8: WARNING: unknown font, skipping request: TS fCB. mandoc: build/tmac/groff_man_style.7:3694:3: WARNING: unknown font, skipping request: TS fCB lfCB. mandoc: build/tmac/groff_man_style.7:3694:8: WARNING: unknown font, skipping request: TS fCB. mandoc: build/tmac/groff_man_style.7:3886:3: WARNING: unknown font, skipping request: TS fCB lfCB. mandoc: build/tmac/groff_man_style.7:3886:8: WARNING: unknown font, skipping request: TS fCB. mandoc: build/tmac/groff_man_style.7:3941:3: WARNING: unknown font, skipping request: TS fCB LfCB. mandoc: build/tmac/groff_man_style.7:3941:8: WARNING: unknown font, skipping request: TS fCB. mandoc: build/tmac/groff_man_style.7:4105:2: UNSUPP: unsupported roff request: do mandoc: build/tmac/groff_man_style.7:3:5: STYLE: lower case character in document title: TH groff_man_style mandoc: build/tmac/groff_man_style.7:3:23: WARNING: cannot parse date, using it verbatim: 21 February 2023 mandoc: build/tmac/groff_man_style.7:2086:2: WARNING: skipping paragraph macro: br at the end of SS
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