Fixup for removal of "joins" and "splits".

* Migrate epm

* Fix docs

pkg/eval/bundled/epm.elv.go

@@ -66,7 +66,7 @@ fn -package-domain [pkg]{
 }
 
 fn -package-without-domain [pkg]{
-  str:split &max=2 / $pkg | drop 1 | joins ''
+  str:split &max=2 / $pkg | drop 1 | str:join ''
 }
 
 # Merge two maps
@@ -269,7 +269,7 @@ fn query [pkg]{
     if (not (has-value $special-keys $key)) {
       val = $data[$key]
       if (eq (kind-of $val) list) {
-        val = (joins ", " $val)
+        val = (str:join ", " $val)
       }
       echo (styled (-first-upper $key)":" blue) $val
     }
@@ -286,7 +286,7 @@ fn installed {
     # without conflicts.
     if $cfg {
       lvl = $cfg[levels]
-      pat = '^\Q'$-lib-dir'/\E('(repeat (+ $lvl 1) '[^/]+' | joins '/')')/$'
+      pat = '^\Q'$-lib-dir'/\E('(repeat (+ $lvl 1) '[^/]+' | str:join '/')')/$'
       put (each [d]{ re:find $pat $d } [ $-lib-dir/$dom/**[nomatch-ok]/ ] )[groups][1][text]
     }
   }
@@ -313,7 +313,7 @@ fn install [&silent-if-installed=$false @pkgs]{
       metadata = (metadata $pkg)
       if (has-key $metadata dependencies) {
         deps = $metadata[dependencies]
-        -info "Installing dependencies: "(joins " " $deps)
+        -info "Installing dependencies: "(str:join " " $deps)
         # If the installation of dependencies fails, uninstall the
         # target package (leave any already-installed dependencies in
         # place)

pkg/eval/str/str.go

@@ -251,13 +251,13 @@ func fromUtf8Bytes(nums ...int) (string, error) {
 // Joins inputs with `$sep`. Examples:
 //
 // ```elvish-transcript
-// ~> put lorem ipsum | joins ,
+// ~> put lorem ipsum | str:join ,
 // ▶ lorem,ipsum
-// ~> joins , [lorem ipsum]
+// ~> str:join , [lorem ipsum]
 // ▶ lorem,ipsum
-// ~> joins '' [lorem ipsum]
+// ~> str:join '' [lorem ipsum]
 // ▶ loremipsum
-// ~> joins '...' [lorem ipsum]
+// ~> str:join '...' [lorem ipsum]
 // ▶ lorem...ipsum
 // ```
 //
@@ -336,10 +336,10 @@ func replace(opts maxOpt, old, repl, s string) string {
 // codepoints.
 //
 // ```elvish-transcript
-// ~> splits , lorem,ipsum
+// ~> str:split , lorem,ipsum
 // ▶ lorem
 // ▶ ipsum
-// ~> splits '' 你好
+// ~> str:split '' 你好
 // ▶ 你
 // ▶ 好
 // ```