Introduce a $kak_config env var containing the Kakoune user config dir

Makes it easier for users who want to locate their kakrc file, and
does not require to go through shell expansion to get it as
"${XDG_CONFIG_DIR:-${HOME}/.config}/kak"

Fixes #1740

2 files changed, 19 insertions, 11 deletions

diff --git a/share/kak/kakrc b/share/kak/kakrc
index 7a9f1692..f8e4415c 100644
--- a/share/kak/kakrc
+++ b/share/kak/kakrc
@@ -1,7 +1,6 @@
 def -params 1 -docstring "colorscheme <name>: enable named colorscheme" \
   -shell-candidates %{
-      localconfdir=${XDG_CONFIG_HOME:-${HOME}/.config}/kak
-      for col in ${kak_runtime}/colors/*.kak ${localconfdir}/colors/*.kak; do
+      for col in ${kak_runtime}/colors/*.kak ${kak_config}/colors/*.kak; do
           candidate=$(basename "${col}" .kak)
           case ${candidate} in
              \**) ;;
@@ -10,10 +9,9 @@ def -params 1 -docstring "colorscheme <name>: enable named colorscheme" \
       done
   } \
   colorscheme %{ %sh{
-    localconfdir=${XDG_CONFIG_HOME:-${HOME}/.config}/kak
     if [ $# -eq 1 ]; then
-        if [ -f "${localconfdir}/colors/$1.kak" ];then
-            echo "source '${localconfdir}/colors/$1.kak'"
+        if [ -f "${kak_config}/colors/$1.kak" ];then
+            echo "source '${kak_config}/colors/$1.kak'"
         else
             echo "source '${kak_runtime}/colors/$1.kak'"
         fi
@@ -28,12 +26,10 @@ def -params 1 -docstring "colorscheme <name>: enable named colorscheme" \
             -exec printf 'try %%{ source "%s" } catch %%{ echo -debug Autoload: could not load "%s" }\n' '{}' '{}' \;
     }
 
-    localconfdir=${XDG_CONFIG_HOME:-${HOME}/.config}/kak
-
     echo "colorscheme default"
 
-    if [ -d "${localconfdir}/autoload" ]; then
-        autoload_directory ${localconfdir}/autoload
+    if [ -d "${kak_config}/autoload" ]; then
+        autoload_directory ${kak_config}/autoload
     elif [ -d "${kak_runtime}/autoload" ]; then
         autoload_directory ${kak_runtime}/autoload
     fi
@@ -42,7 +38,7 @@ def -params 1 -docstring "colorscheme <name>: enable named colorscheme" \
         echo "source '${kak_runtime}/kakrc.local'"
     fi
 
-    if [ -f "${localconfdir}/kakrc" ]; then
-        echo "source '${localconfdir}/kakrc'"
+    if [ -f "${kak_config}/kakrc" ]; then
+        echo "source '${kak_config}/kakrc'"
     fi
 }
diff --git a/src/main.cc b/src/main.cc
index b9f995f6..aff7f9f2 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -68,6 +68,14 @@ String runtime_directory()
     return "/usr/share/kak";
 }
 
+String config_directory()
+{
+    StringView config_home = getenv("XDG_CONFIG_HOME");
+    if (config_home.empty())
+        return format("{}/.config/kak", getenv("HOME"));
+    return format("{}/kak", config_home);
+}
+
 void register_env_vars()
 {
     static const struct {
@@ -113,6 +121,10 @@ void register_env_vars()
             [](StringView name, const Context& context)
             { return runtime_directory(); }
         }, {
+            "config", false,
+            [](StringView name, const Context& context)
+            { return config_directory(); }
+        }, {
             "opt_", true,
             [](StringView name, const Context& context)
             { return context.options()[name.substr(4_byte)].get_as_string(); }