Show a more informative error when running zmodule

from the shell. This means getting

    zmodule: Must be called from ${ZDOTDIR:-${HOME}}/.zimrc

and the full zmodule usage, instead of getting

    zsh: command not found: zmodule

Fixes #430

CHANGELOG.md

@@ -15,6 +15,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Error in `zimfw update` with the `git` tool when module directory is under a
   symlinked directory.
 - Warning when `WARN_CREATE_GLOBAL` is set and `ZIM_HOME` is not.
+- "zsh: command not found: zmodule" when trying to run `zmodule` from the shell.
+  Show a more informative error instead.
 - Don't try to install or update external modules.
 
 ## [1.5.0] - 2021-08-10

src/stage2/29_zimfw_build_init.zsh.erb

@@ -6,6 +6,7 @@ _zimfw_build_init() {
   fi
   _zimfw_mv =(
     print -R "zimfw() { source ${ZIM_HOME}/zimfw.zsh \"\${@}\" }"
+    print -R "zmodule() { source ${ZIM_HOME}/zimfw.zsh \"\${@}\" }"
     local -r zpre=$'*\0'
     if (( ${#_zfpaths} )) print -R 'fpath=('${${_zfpaths#${~zpre}}:A}' ${fpath})'
     if (( ${#_zfunctions} )) print -R 'autoload -Uz '${_zfunctions#${~zpre}}

src/zimfw.zsh.erb

@@ -49,4 +49,8 @@ zim = Zim.new
 
 <%= zim.render_commented("LICENSE") %>
 <%= zim.render_all("src/stage2/*.erb") %>
+if [[ ${functrace[1]} == zmodule:* ]]; then
+  zmodule "${@}"
+else
   zimfw "${@}"
+fi

zimfw.zsh

@@ -59,6 +59,7 @@ _zimfw_build_init() {
   fi
   _zimfw_mv =(
     print -R "zimfw() { source ${ZIM_HOME}/zimfw.zsh \"\${@}\" }"
+    print -R "zmodule() { source ${ZIM_HOME}/zimfw.zsh \"\${@}\" }"
     local -r zpre=$'*\0'
     if (( ${#_zfpaths} )) print -R 'fpath=('${${_zfpaths#${~zpre}}:A}' ${fpath})'
     if (( ${#_zfunctions} )) print -R 'autoload -Uz '${_zfunctions#${~zpre}}
@@ -367,7 +368,7 @@ _zimfw_compile() {
 }
 
 _zimfw_info() {
-  print -R 'zimfw version: '${_zversion}' (built at 2021-09-19 18:30:02 UTC, previous commit is 3e1a89a)'
+  print -R 'zimfw version: '${_zversion}' (built at 2021-09-21 01:00:09 UTC, previous commit is b3b282f)'
   print -R 'ZIM_HOME:      '${ZIM_HOME}
   print -R 'Zsh version:   '${ZSH_VERSION}
   print -R 'System info:   '$(command uname -a)
@@ -781,4 +782,8 @@ Options:
   esac
 }
 
+if [[ ${functrace[1]} == zmodule:* ]]; then
+  zmodule "${@}"
+else
   zimfw "${@}"
+fi