vim-patch:7.4.605

Problem:    The # register is not writable, it cannot be restored after
            jumping around.
Solution:   Make the # register writable. (Marcin Szamotulski)

https://github.com/vim/vim/commit/3b3a9498d1eab3c28c524cce115160528a9a9297

5 files changed, 48 insertions, 11 deletions

diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index e23fc49d89..b461aa521f 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1,4 +1,4 @@
-*change.txt*    For Vim version 7.4.  Last change: 2014 Jun 26
+*change.txt*    For Vim version 7.4.  Last change: 2015 Jan 27
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1110,7 +1110,7 @@ letters to replace their previous contents or as uppercase letters to append
 to their previous contents.  When the '>' flag is present in 'cpoptions' then
 a line break is inserted before the appended text.
 
-5. Read-only registers ":, "., "% and "#
+5. Read-only registers ":, ". and "%
 These are '%', '#', ':' and '.'.  You can use them only with the "p", "P",
 and ":put" commands and with CTRL-R.
 						*quote_.* *quote.* *E29*
@@ -1121,8 +1121,6 @@ and ":put" commands and with CTRL-R.
 		('textwidth' and other options affect what is inserted).
 							*quote_%* *quote%*
 	"%	Contains the name of the current file.
-							*quote_#* *quote#*
-	"#	Contains the name of the alternate file.
 						*quote_:* *quote:* *E30*
 	":	Contains the most recent executed command-line.  Example: Use
 		"@:" to repeat the previous command-line command.
@@ -1130,7 +1128,23 @@ and ":put" commands and with CTRL-R.
 		one character of it was typed.  Thus it remains unchanged if
 		the command was completely from a mapping.
 
-6. Expression register "=			*quote_=* *quote=* *@=*
+							*quote_#* *quote#*
+6. Alternate file register "#
+Contains the name of the alternate file for the current window.  It will
+change how the |CTRL-^| command works.
+This register is writable, mainly to allow for restoring it after a plugin has
+changed it.  It accepts buffer number: >
+    let altbuf = bufnr(@#)
+    ...
+    let @# = altbuf
+It will give error |E86| if you pass buffer number and this buffer does not
+exist.
+It can also accept a match with an existing buffer name: >
+    let @# = 'buffer_name'
+Error |E93| if there is more than one buffer matching the given name or |E94|
+if none of buffers matches the given name.
+
+7. Expression register "=			*quote_=* *quote=* *@=*
 This is not really a register that stores text, but is a way to use an
 expression in commands which use a register.  The expression register is
 read-only; you cannot put text into it.  After the '=', the cursor moves to
@@ -1151,7 +1165,7 @@ If the "= register is used for the "p" command, the String is split up at <NL>
 characters.  If the String ends in a <NL>, it is regarded as a linewise
 register.
 
-7. Selection and drop registers "*, "+ and "~ 
+8. Selection and drop registers "*, "+ and "~ 
 Use these registers for storing and retrieving the selected text for the GUI.
 See |quotestar| and |quoteplus|.  When the clipboard is not available or not
 working, the unnamed register is used instead.  For Unix systems and Mac OS X,
@@ -1169,12 +1183,12 @@ GTK GUI}
 Note: The "~ register is only used when dropping plain text onto Vim.
 Drag'n'drop of URI lists is handled internally.
 
-8. Black hole register "_				*quote_*
+9. Black hole register "_				*quote_*
 When writing to this register, nothing happens.  This can be used to delete
 text without affecting the normal registers.  When reading from this register,
 nothing is returned.
 
-9. Last search pattern register	"/			*quote_/* *quote/*
+10. Last search pattern register	"/		*quote_/* *quote/*
 Contains the most recent search-pattern.  This is used for "n" and 'hlsearch'.
 It is writable with `:let`, you can change it to have 'hlsearch' highlight
 other matches without actually searching.  You can't yank or delete into this
diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 762cd3efd3..f498fca6ad 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -920,7 +920,7 @@ do_buffer (
     if (start == DOBUF_FIRST) {
       /* don't warn when deleting */
       if (!unload)
-        EMSGN(_("E86: Buffer %" PRId64 " does not exist"), count);
+        EMSGN(_(e_nobufnr), count);
     } else if (dir == FORWARD)
       EMSG(_("E87: Cannot go beyond last buffer"));
     else
diff --git a/src/nvim/globals.h b/src/nvim/globals.h
index 52eebebf41..d68e952693 100644
--- a/src/nvim/globals.h
+++ b/src/nvim/globals.h
@@ -2,6 +2,7 @@
 #define NVIM_GLOBALS_H
 
 #include <stdbool.h>
+#include <inttypes.h>
 
 // EXTERN is only defined in main.c. That's where global variables are
 // actually defined and initialized.
@@ -1239,6 +1240,7 @@ EXTERN char_u e_intern2[] INIT(= N_("E685: Internal error: %s"));
 EXTERN char_u e_maxmempat[] INIT(= N_(
         "E363: pattern uses more memory than 'maxmempattern'"));
 EXTERN char_u e_emptybuf[] INIT(= N_("E749: empty buffer"));
+EXTERN char_u e_nobufnr[] INIT(= N_("E86: Buffer %" PRId64 " does not exist"));
 
 EXTERN char_u e_invalpat[] INIT(= N_(
         "E682: Invalid search pattern or delimiter"));
diff --git a/src/nvim/ops.c b/src/nvim/ops.c
index 52b4fed9d7..159b4c03e7 100644
--- a/src/nvim/ops.c
+++ b/src/nvim/ops.c
@@ -705,8 +705,9 @@ bool valid_yank_reg(int regname, bool writing)
 {
   if (       (regname > 0 && ASCII_ISALNUM(regname))
              || (!writing && vim_strchr((char_u *)
-                     "/.%#:="
+                     "/.%:="
                      , regname) != NULL)
+             || regname == '#'
              || regname == '"'
              || regname == '-'
              || regname == '_'
@@ -4658,6 +4659,26 @@ void write_reg_contents_ex(int name,
     return;
   }
 
+  if (name == '#') {
+    buf_T *buf;
+
+    if (ascii_isdigit(*str)) {
+      int num = atoi((char *)str);
+
+      buf = buflist_findnr(num);
+      if (buf == NULL)
+        EMSGN(_(e_nobufnr), (long)num);
+    } else {
+      buf = buflist_findnr(buflist_findpat(str, str + STRLEN(str),
+                           true, false, false));
+    }
+    if (buf == NULL) {
+      return;
+    }
+    curwin->w_alt_fnum = buf->b_fnum;
+    return;
+  }
+
   if (name == '=') {
     size_t offset = 0;
     size_t totlen = (size_t) len;
diff --git a/src/nvim/version.c b/src/nvim/version.c
index b097ac4702..93222ae143 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -388,7 +388,7 @@ static int included_patches[] = {
   608,
   // 607,
   606,
-  // 605,
+  605,
   604,
   // 603,
   602,