make tokenize_variable_array() private

Another step towards implementing issue #4200 is to make the
`tokenize_variable_array()` function private to the env.cpp module.

src/env.cpp

@@ -105,6 +105,7 @@ static const wcstring_list_t colon_delimited_variable({L"PATH", L"MANPATH", L"CD
 // Some forward declarations to make it easy to logically group the code.
 static void init_locale();
 static void init_curses();
+static void tokenize_variable_array(const wcstring &val, wcstring_list_t &out);
 
 // Struct representing one level in the function variable stack.
 // Only our variable stack should create and destroy these
@@ -1621,7 +1622,7 @@ std::unique_ptr<wcstring> list_to_array_val(const wchar_t **list) {
     return val;
 }
 
-void tokenize_variable_array(const wcstring &val, wcstring_list_t &out) {
+static void tokenize_variable_array(const wcstring &val, wcstring_list_t &out) {
     out.clear();  // ensure the output var is empty -- this will normally be a no-op
 
     // Zero element arrays are internally encoded as this placeholder string.

src/env.h

@@ -69,12 +69,6 @@ void env_init(const struct config_paths_t *paths = NULL);
 /// routines.
 void misc_init();
 
-/// Tokenize the specified string into the specified wcstring_list_t.
-///
-/// \param val the input string. The contents of this string is not changed.
-/// \param out the list in which to place the elements.
-void tokenize_variable_array(const wcstring &val, wcstring_list_t &out);
-
 class env_var_t {
    private:
     bool is_missing;

src/expand.cpp

@@ -168,11 +168,11 @@ static int is_quotable(const wchar_t *str) {
 
 static int is_quotable(const wcstring &str) { return is_quotable(str.c_str()); }
 
-wcstring expand_escape_variable(const wcstring &in) {
+wcstring expand_escape_variable(const env_var_t &var) {
     wcstring_list_t lst;
     wcstring buff;
 
-    tokenize_variable_array(in, lst);
+    var.to_list(lst);
 
     size_t size = lst.size();
     if (size == 0) {

src/expand.h

@@ -13,6 +13,7 @@
 #include <vector>
 
 #include "common.h"
+#include "env.h"
 #include "parse_constants.h"
 
 enum {
@@ -120,10 +121,10 @@ __warn_unused expand_error_t expand_string(const wcstring &input, std::vector<co
 bool expand_one(wcstring &inout_str, expand_flags_t flags, parse_error_list_t *errors = NULL);
 
 /// Convert the variable value to a human readable form, i.e. escape things, handle arrays, etc.
-/// Suitable for pretty-printing. The result must be free'd!
+/// Suitable for pretty-printing.
 ///
 /// \param in the value to escape
-wcstring expand_escape_variable(const wcstring &in);
+wcstring expand_escape_variable(const env_var_t &var);
 
 /// Perform tilde expansion and nothing else on the specified string, which is modified in place.
 ///

src/function.cpp

@@ -78,13 +78,12 @@ static int load(const wcstring &name) {
 static void autoload_names(std::set<wcstring> &names, int get_hidden) {
     size_t i;
 
-    const env_var_t path_var_wstr = env_get(L"fish_function_path");
+    const env_var_t path_var = env_get(L"fish_function_path");
-    if (path_var_wstr.missing()) return;
+    if (path_var.missing_or_empty()) return;
-    const wchar_t *path_var = path_var_wstr.c_str();
 
     wcstring_list_t path_list;
+    path_var.to_list(path_list);
 
-    tokenize_variable_array(path_var, path_list);
     for (i = 0; i < path_list.size(); i++) {
         const wcstring &ndir_str = path_list.at(i);
         const wchar_t *ndir = (wchar_t *)ndir_str.c_str();

src/highlight.cpp

@@ -274,14 +274,14 @@ rgb_color_t highlight_get_color(highlight_spec_t highlight, bool is_background)
 
     if (var.missing()) var = env_get(highlight_var[0]);
 
-    if (!var.missing()) result = parse_color(var.as_string(), treat_as_background);
+    if (!var.missing()) result = parse_color(var, treat_as_background);
 
     // Handle modifiers.
     if (highlight & highlight_modifier_valid_path) {
-        env_var_t val2_wstr = env_get(L"fish_color_valid_path");
+        env_var_t var2 = env_get(L"fish_color_valid_path");
-        const wcstring val2 = val2_wstr.missing() ? L"" : val2_wstr.c_str();
+        const wcstring val2 = var2.missing() ? L"" : var2.c_str();
 
-        rgb_color_t result2 = parse_color(val2, is_background);
+        rgb_color_t result2 = parse_color(var2, is_background);
         if (result.is_normal())
             result = result2;
         else {

src/output.cpp

@@ -486,8 +486,8 @@ rgb_color_t best_color(const std::vector<rgb_color_t> &candidates, color_support
 }
 
 /// Return the internal color code representing the specified color.
-/// XXX This code should be refactored to enable sharing with builtin_set_color.
+/// TODO: This code should be refactored to enable sharing with builtin_set_color.
-rgb_color_t parse_color(const wcstring &val, bool is_background) {
+rgb_color_t parse_color(const env_var_t &var, bool is_background) {
     int is_bold = 0;
     int is_underline = 0;
     int is_italics = 0;
@@ -497,7 +497,7 @@ rgb_color_t parse_color(const wcstring &val, bool is_background) {
     std::vector<rgb_color_t> candidates;
 
     wcstring_list_t el;
-    tokenize_variable_array(val, el);
+    var.to_list(el);
 
     for (size_t j = 0; j < el.size(); j++) {
         const wcstring &next = el.at(j);

src/output.h

@@ -36,7 +36,7 @@ int writech(wint_t ch);
 
 void writestr(const wchar_t *str);
 
-rgb_color_t parse_color(const wcstring &val, bool is_background);
+rgb_color_t parse_color(const env_var_t &val, bool is_background);
 
 int writeb(tputs_arg_t b);
 

src/path.cpp

@@ -60,8 +60,8 @@ static bool path_get_path_core(const wcstring &cmd, wcstring *out_path,
         bin_path = *list_to_array_val(wcstring_list_t({L"/bin", L"/usr/bin", PREFIX L"/bin"}));
     }
 
-    std::vector<wcstring> pathsv;
+    wcstring_list_t pathsv;
-    tokenize_variable_array(bin_path, pathsv);
+    bin_path_var.to_list(pathsv);
     for (auto next_path : pathsv) {
         if (next_path.empty()) continue;
         append_path_component(next_path, cmd);