allow optional offset in POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER; see #896

config/p10k-classic.zsh

@@ -247,6 +247,11 @@
   # /foo/bar/git_repo/nested_git_repo/baz, prompt will display git_repo/nested_git_repo/baz (first)
   # or nested_git_repo/baz (last). This assumes that git_repo and nested_git_repo contain markers
   # and other directories don't.
+  #
+  # Optionally, "first" and "last" can be followed by ":<offset>" where <offset> is an integer.
+  # This moves the truncation point to the right (positive offset) or to the left (negative offset)
+  # relative to the marker. Plain "first" and "last" are equivalent to "first:0" and "last:0"
+  # respectively.
   typeset -g POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER=false
   # Don't shorten this many last directory segments. They are anchors.
   typeset -g POWERLEVEL9K_SHORTEN_DIR_LENGTH=1

config/p10k-lean-8colors.zsh

@@ -241,6 +241,11 @@
   # /foo/bar/git_repo/nested_git_repo/baz, prompt will display git_repo/nested_git_repo/baz (first)
   # or nested_git_repo/baz (last). This assumes that git_repo and nested_git_repo contain markers
   # and other directories don't.
+  #
+  # Optionally, "first" and "last" can be followed by ":<offset>" where <offset> is an integer.
+  # This moves the truncation point to the right (positive offset) or to the left (negative offset)
+  # relative to the marker. Plain "first" and "last" are equivalent to "first:0" and "last:0"
+  # respectively.
   typeset -g POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER=false
   # Don't shorten this many last directory segments. They are anchors.
   typeset -g POWERLEVEL9K_SHORTEN_DIR_LENGTH=1

config/p10k-lean.zsh

@@ -241,6 +241,11 @@
   # /foo/bar/git_repo/nested_git_repo/baz, prompt will display git_repo/nested_git_repo/baz (first)
   # or nested_git_repo/baz (last). This assumes that git_repo and nested_git_repo contain markers
   # and other directories don't.
+  #
+  # Optionally, "first" and "last" can be followed by ":<offset>" where <offset> is an integer.
+  # This moves the truncation point to the right (positive offset) or to the left (negative offset)
+  # relative to the marker. Plain "first" and "last" are equivalent to "first:0" and "last:0"
+  # respectively.
   typeset -g POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER=false
   # Don't shorten this many last directory segments. They are anchors.
   typeset -g POWERLEVEL9K_SHORTEN_DIR_LENGTH=1

config/p10k-rainbow.zsh

@@ -247,6 +247,11 @@
   # /foo/bar/git_repo/nested_git_repo/baz, prompt will display git_repo/nested_git_repo/baz (first)
   # or nested_git_repo/baz (last). This assumes that git_repo and nested_git_repo contain markers
   # and other directories don't.
+  #
+  # Optionally, "first" and "last" can be followed by ":<offset>" where <offset> is an integer.
+  # This moves the truncation point to the right (positive offset) or to the left (negative offset)
+  # relative to the marker. Plain "first" and "last" are equivalent to "first:0" and "last:0"
+  # respectively.
   typeset -g POWERLEVEL9K_DIR_TRUNCATE_BEFORE_MARKER=false
   # Don't shorten this many last directory segments. They are anchors.
   typeset -g POWERLEVEL9K_SHORTEN_DIR_LENGTH=1