Add nicer dark and light colour sets (themes) used on terminals with 256

or more colours. Currently based these on emacs but they could change.
Terminals with fewer colours use the ANSI colours. A new "theme" option
overrides the detected theme (set to "terminal" to go back to ANSI
colours).

options-table.c

@@ -109,6 +109,9 @@ static const char *options_table_extended_keys_format_list[] = {
 static const char *options_table_allow_passthrough_list[] = {
 	"off", "on", "all", NULL
 };
+static const char *options_table_theme_list[] = {
+	"detect", "terminal", "light", "dark", NULL
+};
 static const char *options_table_copy_mode_line_numbers_list[] = {
 	"off", "default", "absolute", "relative", "hybrid", NULL
 };
@@ -446,7 +449,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
 	  .flags = OPTIONS_TABLE_IS_STYLE,
-	  .default_str = "default",
+	  .default_str = "bg=themedarkgrey,fg=themewhite",
 	  .separator = ",",
 	  .text = "Default style of menu."
 	},
@@ -455,7 +458,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
 	  .flags = OPTIONS_TABLE_IS_STYLE,
-	  .default_str = "bg=yellow,fg=black",
+	  .default_str = "bg=themeyellow,fg=themeblack",
 	  .separator = ",",
 	  .text = "Default style of selected menu item."
 	},
@@ -463,7 +466,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "menu-border-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "default",
+	  .default_str = "bg=themedarkgrey,fg=themelightgrey",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Default style of menu borders."
@@ -538,6 +541,175 @@ const struct options_table_entry options_table[] = {
 		  "automatically detected."
 	},
 
+	{ .name = "theme",
+	  .type = OPTIONS_TABLE_CHOICE,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .choices = options_table_theme_list,
+	  .default_num = 0,
+	  .text = "Whether tmux should detect the terminal theme, use terminal "
+		  "ANSI colours, or force the light or dark theme."
+	},
+
+	{ .name = "dark-theme-black",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray5,black}",
+	  .text = "Dark theme colour for black."
+	},
+
+	{ .name = "dark-theme-white",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray90,white}",
+	  .text = "Dark theme colour for white."
+	},
+
+	{ .name = "dark-theme-light-grey",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray70,white}",
+	  .text = "Dark theme colour for light grey."
+	},
+
+	{ .name = "dark-theme-dark-grey",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray15,black}",
+	  .text = "Dark theme colour for dark grey."
+	},
+
+	{ .name = "dark-theme-green",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},palegreen,green}",
+	  .text = "Dark theme colour for green."
+	},
+
+	{ .name = "dark-theme-yellow",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},lightgoldenrod,yellow}",
+	  .text = "Dark theme colour for yellow."
+	},
+
+	{ .name = "dark-theme-red",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},lightsalmon,red}",
+	  .text = "Dark theme colour for red."
+	},
+
+	{ .name = "dark-theme-blue",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},lightskyblue,blue}",
+	  .text = "Dark theme colour for blue."
+	},
+
+	{ .name = "dark-theme-cyan",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},aquamarine,cyan}",
+	  .text = "Dark theme colour for cyan."
+	},
+
+	{ .name = "dark-theme-magenta",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},plum,magenta}",
+	  .text = "Dark theme colour for magenta."
+	},
+
+	{ .name = "light-theme-black",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray10,black}",
+	  .text = "Light theme colour for black."
+	},
+
+	{ .name = "light-theme-white",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray95,white}",
+	  .text = "Light theme colour for white."
+	},
+
+	{ .name = "light-theme-light-grey",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray80,white}",
+	  .text = "Light theme colour for light grey."
+	},
+
+	{ .name = "light-theme-dark-grey",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},gray45,black}",
+	  .text = "Light theme colour for dark grey."
+	},
+
+	{ .name = "light-theme-green",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},forestgreen,green}",
+	  .text = "Light theme colour for green."
+	},
+
+	{ .name = "light-theme-yellow",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},darkgoldenrod,yellow}",
+	  .text = "Light theme colour for yellow."
+	},
+
+	{ .name = "light-theme-red",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},violetred4,red}",
+	  .text = "Light theme colour for red."
+	},
+
+	{ .name = "light-theme-blue",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},royalblue,blue}",
+	  .text = "Light theme colour for blue."
+	},
+
+	{ .name = "light-theme-cyan",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},darkcyan,cyan}",
+	  .text = "Light theme colour for cyan."
+	},
+
+	{ .name = "light-theme-magenta",
+	  .type = OPTIONS_TABLE_STRING,
+	  .scope = OPTIONS_TABLE_SERVER,
+	  .flags = OPTIONS_TABLE_IS_COLOUR,
+	  .default_str = "#{?#{e|>=:#{client_colours},256},purple,magenta}",
+	  .text = "Light theme colour for magenta."
+	},
+
 	{ .name = "user-keys",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SERVER,
@@ -639,7 +811,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
 	  .flags = OPTIONS_TABLE_IS_COLOUR,
-	  .default_str = "red",
+	  .default_str = "themered",
 	  .text = "Colour of the active pane for 'display-panes'."
 	},
 
@@ -647,7 +819,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
 	  .flags = OPTIONS_TABLE_IS_COLOUR,
-	  .default_str = "blue",
+	  .default_str = "themeblue",
 	  .text = "Colour of not active panes for 'display-panes'."
 	},
 
@@ -738,7 +910,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "message-command-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
-	  .default_str = "bg=black,fg=yellow,fill=black",
+	  .default_str = "bg=themegreen,fg=themeblack,fill=themegreen",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the command prompt when in command mode, if "
@@ -767,9 +939,9 @@ const struct options_table_entry options_table[] = {
 	{ .name = "message-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
-	  .default_str = "bg=yellow,fg=black,"
+	  .default_str = "bg=themeyellow,fg=themeblack,"
 			 "#{?#{m/r:(^|#,)IS(PANE|MODE)($|#,),#{prompt_flags}},,"
-			 "fill=yellow}",
+			 "fill=themeyellow}",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of messages and the command prompt. "
@@ -968,7 +1140,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "status-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
-	  .default_str = "bg=green,fg=black",
+	  .default_str = "bg=themegreen,fg=themeblack",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the status line."
@@ -1152,7 +1324,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
 	  .flags = OPTIONS_TABLE_IS_COLOUR,
-	  .default_str = "blue",
+	  .default_str = "themeblue",
 	  .text = "Colour of the clock in clock mode."
 	},
 
@@ -1167,7 +1339,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "copy-mode-match-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "bg=cyan,fg=black",
+	  .default_str = "bg=themecyan,fg=themeblack",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of search matches in copy mode."
@@ -1176,7 +1348,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "copy-mode-current-match-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "bg=magenta,fg=black",
+	  .default_str = "bg=thememagenta,fg=themeblack",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the current search match in copy mode."
@@ -1185,7 +1357,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "copy-mode-mark-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "bg=red,fg=black",
+	  .default_str = "bg=themeyellow,fg=themeblack",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the marked line in copy mode."
@@ -1224,7 +1396,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "copy-mode-current-line-number-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "fg=yellow",
+	  .default_str = "fg=themeyellow",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of current line number in copy mode."
@@ -1233,7 +1405,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "copy-mode-line-number-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "fg=white,dim",
+	  .default_str = "fg=themelightgrey,dim",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of line numbers in copy mode."
@@ -1282,7 +1454,7 @@ const struct options_table_entry options_table[] = {
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
 	  .flags = OPTIONS_TABLE_IS_STYLE,
-	  .default_str = "noattr,bg=yellow,fg=black",
+	  .default_str = "noattr,bg=themeyellow,fg=themeblack",
 	  .separator = ",",
 	  .text = "Style of indicators and highlighting in modes."
 	},
@@ -1331,7 +1503,9 @@ const struct options_table_entry options_table[] = {
 	{ .name = "pane-active-border-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
-	  .default_str = "#{?pane_in_mode,fg=yellow,#{?synchronize-panes,fg=red,fg=green}}",
+	  .default_str = "fg=#{?pane_marked,thememagenta,"
+	                 "#{?synchronize-panes,themered,"
+	                 "#{?pane_in_mode,themeyellow,themegreen}}}",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the active pane border."
@@ -1390,7 +1564,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "pane-border-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
-	  .default_str = "default",
+	  .default_str = "fg=themelightgrey",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the pane status lines."
@@ -1415,7 +1589,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "pane-scrollbars-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
-	  .default_str = "bg=black,fg=white,width=1,pad=0",
+	  .default_str = "bg=themedarkgrey,fg=themelightgrey,width=1,pad=0",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the pane scrollbar."
@@ -1432,7 +1606,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "popup-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "default",
+	  .default_str = "bg=themedarkgrey,fg=themewhite",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Default style of popups."
@@ -1441,7 +1615,7 @@ const struct options_table_entry options_table[] = {
 	{ .name = "popup-border-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_WINDOW,
-	  .default_str = "default",
+	  .default_str = "fg=themelightgrey",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Default style of popup borders."
@@ -1519,8 +1693,8 @@ const struct options_table_entry options_table[] = {
 	  .default_str = "fg=#{?#{||:"
 			 "#{&&:#{pane_format},#{pane_active}},"
 			 "#{&&:#{window_format},#{window_active}}},"
-			 "#{display-panes-active-colour},"
-			 "#{display-panes-colour}}",
+			 "themered,"
+			 "themeblue}",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of preview indicator in tree mode."