feat(glossy): Panic on multiple requested modes

When multiple modes are requested at the same time
(like 'long' & 'short'), panic with a clear error message.

This is better than guessing what the user wanted.

glossy/tests/abbreviated-syntax/test.typ

@@ -40,18 +40,29 @@ Now make sure I get your @tps:short reports by 2pm!
 
 == Using conflicting modifiers (short, long, both)
 
-These modifiers are semantically mutually exclusive, by they can be combined
-syntactically. When multiple are used, `glossy` tries to make a smart choice on
-which one to display.
+These modifiers are semantically mutually exclusive. When multiple are used,
+`glossy` throws an error to the compiler, explaining the problem.
+
+#import "/src/gloss.typ": __gls, __default-format-term
+#let manual-gls(key, mods) = __gls(key, modes-modifiers: mods, format-term: __default-format-term, show-term: (body) => [#strong(body)], term-links: false, display-text: none)
+#assert-panic(manual-gls.with("tps", ("short", "long")))
+#let msg-short-long = "panicked with: \"Cannot mix modes \", (\"short\", \"long\"), \", pick one.\""
+#let msg-short-both = "panicked with: \"Cannot mix modes \", (\"short\", \"both\"), \", pick one.\""
+#let msg-long-both = "panicked with: \"Cannot mix modes \", (\"long\", \"both\"), \", pick one.\""
+#let msg-short-long-both = "panicked with: \"Cannot mix modes \", (\"short\", \"long\", \"both\"), \", pick one.\""
 
 #table(
   columns: 2,
-  table.header([*Input*], [*Output*]),
+  table.header([*Input*], [*Error*]),
 
-  [`@tps:short:long`     ], [@tps:short:long],
-  [`@tps:short:both`     ], [@tps:short:both],
-  [`@tps:long:both`      ], [@tps:long:both],
-  [`@tps:short:long:both`], [@tps:short:long:both],
+  [`@tps:short:long`     ], [#assert.eq(catch(manual-gls.with("tps", ("short", "long"))),
+                                        msg-short-long)#msg-short-long],
+  [`@tps:short:both`     ], [#assert.eq(catch(manual-gls.with("tps", ("short", "both"))),
+                                        msg-short-both)#msg-short-both],
+  [`@tps:long:both`      ], [#assert.eq(catch(manual-gls.with("tps", ("long", "both"))),
+                                        msg-long-both)#msg-long-both],
+  [`@tps:short:long:both`], [#assert.eq(catch(manual-gls.with("tps", ("short", "long", "both"))),
+                                        msg-short-long-both)#msg-short-long-both],
 )
 
 #let my-theme = (

glossy/tests/demo/test.typ

@@ -78,18 +78,29 @@ Articles are incompatible with the `pl` (plural) modifier.
 
 == Using conflicting modifiers (short, long, both)
 
-These modifiers are semantically mutually exclusive, by they can be combined
-syntactically. When multiple are used, `glossy` tries to make a smart choice on
-which one to display.
+These modifiers are semantically mutually exclusive. When multiple are used,
+`glossy` throws an error to the compiler, explaining the problem.
+
+#import "/src/gloss.typ": __gls, __default-format-term
+#let manual-gls(key, mods) = __gls(key, modes-modifiers: mods, format-term: __default-format-term, show-term: (body) => [#strong(body)], term-links: false, display-text: none)
+#assert-panic(manual-gls.with("tps", ("short", "long")))
+#let msg-short-long = "panicked with: \"Cannot mix modes \", (\"short\", \"long\"), \", pick one.\""
+#let msg-short-both = "panicked with: \"Cannot mix modes \", (\"short\", \"both\"), \", pick one.\""
+#let msg-long-both = "panicked with: \"Cannot mix modes \", (\"long\", \"both\"), \", pick one.\""
+#let msg-short-long-both = "panicked with: \"Cannot mix modes \", (\"short\", \"long\", \"both\"), \", pick one.\""
 
 #table(
   columns: 2,
-  table.header([*Input*], [*Output*]),
+  table.header([*Input*], [*Error*]),
 
-  [`@tps:short:long`     ], [@tps:short:long],
-  [`@tps:short:both`     ], [@tps:short:both],
-  [`@tps:long:both`      ], [@tps:long:both],
-  [`@tps:short:long:both`], [@tps:short:long:both],
+  [`@tps:short:long`     ], [#assert.eq(catch(manual-gls.with("tps", ("short", "long"))),
+                                        msg-short-long)#msg-short-long],
+  [`@tps:short:both`     ], [#assert.eq(catch(manual-gls.with("tps", ("short", "both"))),
+                                        msg-short-both)#msg-short-both],
+  [`@tps:long:both`      ], [#assert.eq(catch(manual-gls.with("tps", ("long", "both"))),
+                                        msg-long-both)#msg-long-both],
+  [`@tps:short:long:both`], [#assert.eq(catch(manual-gls.with("tps", ("short", "long", "both"))),
+                                        msg-short-long-both)#msg-short-long-both],
 )
 
 #let my-theme = (

glossy/tests/refs-exhaustive/test.typ

@@ -293,14 +293,25 @@ This document tries all reference forms and modifiers on a large set of terms.
 
 == Conflicting multiple modifiers combined (short, long, both together)
 
-- @tps:short:long
-- @tps:short:both
-- @tps:long:both
-- @tps:short:long:both
-- @html:both:long:short
-- @doc:long:short
-- @cpu:both:long:short
-- @api:short:long:both
+Assert that a panic occurs.
+#import "/src/gloss.typ": __gls, __default-format-term
+#let manual-gls(key, mods) = __gls(key, modes-modifiers: mods, format-term: __default-format-term, show-term: (body) => [#strong(body)], term-links: false, display-text: none)
+//- @tps:short:long
+#assert-panic(manual-gls.with("tps", ("short", "long")))
+//- @tps:short:both
+#assert-panic(manual-gls.with("tps", ("short", "both")))
+//- @tps:long:both
+#assert-panic(manual-gls.with("tps", ("long", "both")))
+//- @tps:short:long:both
+#assert-panic(manual-gls.with("tps", ("short", "long", "both")))
+//- @html:both:long:short
+#assert-panic(manual-gls.with("html", ("both", "long", "short")))
+//- @doc:long:short
+#assert-panic(manual-gls.with("doc", ("long", "short")))
+//- @cpu:both:long:short
+#assert-panic(manual-gls.with("cpu", ("both", "long", "short")))
+//- @api:short:long:both
+#assert-panic(manual-gls.with("api", ("short", "long", "both")))
 
 == Combining capitalization and plural with short/long/both