fix: zsh impl of realpath handles old macOS BSD realpath

Signed-off-by: Vladislav Doster <mvdoster@gmail.com>

.gitignore

@@ -1,24 +1,3 @@
-*.[aos]
-*.bundle
-*.dll
-*.orig
-*.txt
-*.zini
 *.zwc
-*deploy*key*
-*~
-.*.sw?
-.project
-TAGS
-TODO*
-\#*
 doc/zsdoc/data
-other
-site*/
-tags
-test/
-txt/
-zmodules/
-tests/_output/
-tests/_support/tmp*
-.idea
+tests/_support/tmp\.*

Makefile

@@ -7,7 +7,11 @@ DOC_SRC := $(foreach wrd,$(SRC),../$(wrd))
 .PHONY: all clean container doc doc/container tags tags/emacs tags/vim test zwc
 
 clean:
-	rm -rf *.zwc doc/zsdoc/zinit{'','-additional','-autoload','-install','-side'}.zsh.adoc doc/zsdoc/data/
+	@rm -rf -- \
+		*.zwc \
+		tests/_support/tmp* \
+		doc/zsdoc/{doc,zinit{'','-additional','-autoload','-install','-side'}.zsh.adoc} \
+
 
 container:
 	docker build --tag=ghcr.io/zdharma-continuum/zinit:latest --file=docker/Dockerfile .

doc/zsdoc/zinit-install.zsh.adoc

@@ -24,6 +24,7 @@ Documentation automatically generated with `zshelldoc'
  .zinit-json-get-value
  .zinit-json-to-array
  .zinit-mirror-using-svn
+ .zinit-realpath
  .zinit-setup-plugin-dir
  .zinit-single-line
  .zinit-update-snippet
@@ -193,7 +194,7 @@ ____
 
 ____
 
-Has 377 line(s). Calls functions:
+Has 372 line(s). Calls functions:
 
  .zinit-download-snippet
  |-- .zinit-download-file-stdout
@@ -211,10 +212,9 @@ Has 377 line(s). Calls functions:
  |   `-- zinit.zsh/.zinit-any-to-user-plugin
  |-- .zinit-mirror-using-svn
  |-- zinit-side.zsh/.zinit-store-ices
- |-- zinit.zsh/+zinit-message
- `-- zinit.zsh/is-at-least
+ `-- zinit.zsh/+zinit-message
 
-Uses feature(s): _is-at-least_, _setopt_, _trap_, _zcompile_
+Uses feature(s): _setopt_, _trap_, _zcompile_
 
 Called by:
 
@@ -458,6 +458,20 @@ Called by:
 
  .zinit-download-snippet
 
+==== .zinit-realpath
+
+____
+ 
+ 
+ $1: Initial path
+ $2: Target path
+
+____
+
+Has 16 line(s). Doesn't call other functions.
+
+Not called by script or any function (may be e.g. a hook, a Zle widget, etc.).
+
 ==== .zinit-setup-plugin-dir
 
 ____
@@ -541,8 +555,7 @@ Has 76 line(s). Calls functions:
  |   |   `-- zinit.zsh/.zinit-any-to-user-plugin
  |   |-- .zinit-mirror-using-svn
  |   |-- zinit-side.zsh/.zinit-store-ices
- |   |-- zinit.zsh/+zinit-message
- |   `-- zinit.zsh/is-at-least
+ |   `-- zinit.zsh/+zinit-message
  |-- zinit.zsh/+zinit-message
  |-- zinit.zsh/.zinit-get-object-path
  `-- zinit.zsh/.zinit-pack-ice

doc/zsdoc/zinit.zsh.adoc

@@ -1965,5 +1965,4 @@ Called by:
  :zinit-tmp-subst-autoload
  :zinit-tmp-subst-bindkey
  Script-Body
- zinit-install.zsh/.zinit-download-snippet
 

zinit-install.zsh

@@ -6,7 +6,28 @@ builtin source "${ZINIT[BIN_DIR]}/zinit-side.zsh" || {
     builtin print -P "${ZINIT[col-error]}ERROR:%f%b Couldn't find ${ZINIT[col-obj]}zinit-side.zsh%f%b."
     return 1
 }
-
+# FUNCTION: .zinit-realpath [[[
+#
+# $1: Initial path
+# $2: Target path
+.zinit-realpath () {
+    [[ $# -ge 1 ]] && [[ $# -le 2 ]] || return 1
+    local target=${${2:-$1}:a} current=${${${2:+$1}:-$PWD}:a} relative=''
+    local appendix="${target#/}"
+    while appendix="${target#${current}/}"
+        [[ $current != '/' ]] && [[ $appendix = $target ]]
+    do
+        if [[ $current = $appendix ]]; then
+            relative="${relative:-.}"
+            builtin print -- "${relative#/}"
+            return 0
+        fi
+        current=${current%/*}
+        relative="$relative${relative:+/}.."
+    done
+    relative+=${relative:+${appendix:+/}}${appendix#/}
+    builtin print -- "$relative"
+} # ]]]
 # FUNCTION: .zinit-jq-check [[[
 # Check if jq is available and outputs an error message with instructions if
 # that's not the case
@@ -1198,13 +1219,8 @@ builtin source "${ZINIT[BIN_DIR]}/zinit-side.zsh" || {
     "${${(M)OPTS[opt_-q,--quiet]:#1}:+, skip the -q/--quiet option for more information}.{rst}"; retval=4; }
                 }
             } else {
-                if (( $+commands[realpath] )) {
-                    local rpv="$(realpath --version | head -n1 | sed -E 's/realpath (\(.*\))?//g')"
-                    if is-at-least 8.23 $rpv; then
-                        rel_url="$(realpath --relative-to="$local_dir/$dirname" "$url")" && \
-                            { url="$rel_url" }
-                    fi
-                }
+                rel_url="$(.zinit-realpath "$local_dir/$dirname" "$url")" && \
+                    { url="$rel_url" }
                 if (( !OPTS[opt_-q,--quiet] )) && [[ $url != /dev/null ]] {
                     +zinit-message "{msg}Linking {file}$filename{msg}{…}{rst}"
                     command ln -svf "$url" "$local_dir/$dirname/$filename" || \