Suffixer is a little RoboFont extension for editing glyph name suffixes. It can append a suffix to the names of selected glyphs, or replace an existing suffix with a new one (or none) in selected glyphs or the whole font.
Suffixer comes with a list of suffix presets case, dnom, fina, hist, init, isol, locl, lnum, medi, numr, onum, ordn, tnum, pcap, salt, sinf, smcp, ss01, ss02, ss03, ss04, ss05, ss06, ss07, ss08, ss09, ss10, ss11, ss12, ss13, ss14, ss15, ss16, ss17, ss18, ss19, ss20, subs, sups, swsh, titl, zero. These are modeled after OpenType feature names – a frequent usage scenario. But you can of course also enter other suffixes; these will be saved to the extension preferences and subsequently included in the preset list.
Suffixer does not live in the Extensions menu (which quickly becomes cluttered) but can be activated via the main Font menu of RoboFont under the heading Change Suffixes..., or with the shortcut Cmd+Alt+Shift+S.
Update v1.1 (June 2015) addresses/fixes a bug that caused double periods to appear when handling glyphnames with multiple suffixes (thanks to DJR for the bug report), and fixes some other small issues.
Some things about renaming glyphs, and a word of caution:
If you rename a glyph from RoboFont’s main interface, you are asked to confirm that the glyph should also be renamed in groups, in kerning, and with regard to components. Suffixer has all these options on by default, which means it should not break things like composites or kerning. It also globally assigns auto unicodes in the end (which is relevant if you are using it to add or remove suffixes). If you think any of these options should be deselectable, please let me know.
If Suffixer encounters that your current font already has a glyph with a name to be newly assigned to a different glyph, the previously existing glyph will be renamed to [its present name].copy_1 (or if that is taken, .copy_2 and so forth); so nothing should be lost.
Note the usage of the word “should” in the above two paragraphs; this is still an early version, so please use with caution (= make a copy of your font first), and report things that break.
PS. Caution when removing suffixes, re. composites: One scenario that has proven to be problematic is when you use Suffixer to make a previously-suffixed set of glyphs the new default – for instance, make A.new B.new C.new into A, B, and C, replacing your previous standard A, B, and C glyphs. As it is now, Suffixer will keep and rename the old A, B, and C glyphs; but any composite glyphs that have those in them will keep referencing these old glyphs instead of (what you maybe wanted) the new ones. I'm currently thinking how to best handle these cases: Maybe Suffixer should ask whether to keep or overwrite, and/or which glyphs the composites should refer to. Opinions welcome.