patch 8.0.1152: encoding of error message wrong in Cygwin terminal

Problem:    Encoding of error message wrong in Cygwin terminal.
Solution:   Get locale from environment variables. (Ken Takata)

src/main.c

@@ -2564,6 +2564,21 @@ check_tty(mparm_T *parmp)
 #if defined(WIN3264) && !defined(FEAT_GUI_W32)
 	if (is_cygpty_used())
 	{
+# if defined(FEAT_MBYTE) && defined(HAVE_BIND_TEXTDOMAIN_CODESET) \
+	&& defined(FEAT_GETTEXT)
+	    char    *s, *tofree = NULL;
+
+	    /* Set the encoding of the error message based on $LC_ALL or
+	     * other environment variables instead of 'encoding'.
+	     * Note that the message is shown on a Cygwin terminal (e.g.
+	     * mintty) which encoding is based on $LC_ALL or etc., not the
+	     * current codepage used by normal Win32 console programs. */
+	    tofree = s = enc_locale_env(NULL);
+	    if (s == NULL)
+		s = "utf-8";	/* Use "utf-8" by default. */
+	    (void)bind_textdomain_codeset(VIMPACKAGE, s);
+	    vim_free(tofree);
+# endif
 	    mch_errmsg(_("Vim: Error: This version of Vim does not run in a Cygwin terminal\n"));
 	    exit(1);
 	}

src/mbyte.c

@@ -4389,41 +4389,27 @@ enc_alias_search(char_u *name)
 #  include <langinfo.h>
 # endif
 
+# ifndef FEAT_GUI_W32
 /*
- * Get the canonicalized encoding of the current locale.
+ * Get the canonicalized encoding from the specified locale string "locale"
+ * or from the environment variables LC_ALL, LC_CTYPE and LANG.
  * Returns an allocated string when successful, NULL when not.
  */
     char_u *
-enc_locale(void)
+enc_locale_env(char *locale)
 {
-#ifndef WIN3264
-    char	*s;
+    char	*s = locale;
     char	*p;
     int		i;
-#endif
     char	buf[50];
-#ifdef WIN3264
-    long	acp = GetACP();
 
-    if (acp == 1200)
-	STRCPY(buf, "ucs-2le");
-    else if (acp == 1252)	    /* cp1252 is used as latin1 */
-	STRCPY(buf, "latin1");
-    else
-	sprintf(buf, "cp%ld", acp);
-#else
-# ifdef HAVE_NL_LANGINFO_CODESET
-    if ((s = nl_langinfo(CODESET)) == NULL || *s == NUL)
-# endif
-#  if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
-	if ((s = setlocale(LC_CTYPE, NULL)) == NULL || *s == NUL)
-#  endif
+    if (s == NULL || *s == NUL)
 	if ((s = getenv("LC_ALL")) == NULL || *s == NUL)
 	    if ((s = getenv("LC_CTYPE")) == NULL || *s == NUL)
 		s = getenv("LANG");
 
     if (s == NULL || *s == NUL)
-	return FAIL;
+	return NULL;
 
     /* The most generic locale format is:
      * language[_territory][.codeset][@modifier][+special][,[sponsor][_revision]]
@@ -4458,10 +4444,44 @@ enc_locale(void)
 	    break;
     }
     buf[i] = NUL;
-#endif
 
     return enc_canonize((char_u *)buf);
 }
+# endif
+
+/*
+ * Get the canonicalized encoding of the current locale.
+ * Returns an allocated string when successful, NULL when not.
+ */
+    char_u *
+enc_locale(void)
+{
+# ifdef WIN3264
+    char	buf[50];
+    long	acp = GetACP();
+
+    if (acp == 1200)
+	STRCPY(buf, "ucs-2le");
+    else if (acp == 1252)	    /* cp1252 is used as latin1 */
+	STRCPY(buf, "latin1");
+    else
+	sprintf(buf, "cp%ld", acp);
+
+    return enc_canonize((char_u *)buf);
+# else
+    char	*s;
+
+#  ifdef HAVE_NL_LANGINFO_CODESET
+    if ((s = nl_langinfo(CODESET)) == NULL || *s == NUL)
+#  endif
+#  if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
+	if ((s = setlocale(LC_CTYPE, NULL)) == NULL || *s == NUL)
+#  endif
+	    s = NULL;
+
+    return enc_locale_env(s);
+# endif
+}
 
 # if defined(WIN3264) || defined(PROTO) || defined(FEAT_CYGWIN_WIN32_CLIPBOARD)
 /*

src/proto/mbyte.pro

@@ -71,6 +71,7 @@ int mb_lefthalve(int row, int col);
 int mb_fix_col(int col, int row);
 char_u *enc_skip(char_u *p);
 char_u *enc_canonize(char_u *enc);
+char_u *enc_locale_env(char *locale);
 char_u *enc_locale(void);
 int encname2codepage(char_u *name);
 void *my_iconv_open(char_u *to, char_u *from);

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1152,
 /**/
     1151,
 /**/