Added alias configfile setting

This patch is written by a anonymous author, see patch on sf.net
id #2663691 . I changed it a bit so that it can't overwrite
existing environment variables and updated the docs and syntaxfiles

ChangeLog

@@ -1,3 +1,7 @@
+2009-03-07
+	* Added alias patch ( sf.net id #2663691 ) changed it to prevent it from
+	overwriting existing environment variables and updated docs, syntaxfiles, ...
+
 2009-03-01
 	* Added if_updatenr
 	* Rewrite human_readable() to minimise amount of padding

README

@@ -155,6 +155,16 @@ conky(1)							      conky(1)
        You might want to copy it to $HOME/.conkyrc and	then  start  modifying
        it.  Other configs can be found at http://conky.sf.net/
 
+       1malias0m
+	      Use this to create aliases of variables. The first argument is
+	      the new name, the second the old name, and the other arguments
+	      are passed on to the variable. Example: If you want to use $alpha
+	      instead of ${beta gamma delta} then you have to write the following:
+	      alias alpha beta gamma delta . PS: Instead of creating an alias
+	      in the config you can also use environment variables. Example:
+	      Start conky like this: alpha="beta gamma delta" conky
+
+
        1malignment0m
 	      Aligned position on screen, may be top_left, top_right, top_mid‐
 	      dle, bottom_left, bottom_right, bottom_middle, middle_left, mid‐

doc/config_settings.xml

@@ -1,4 +1,11 @@
 <variablelist>
+	<varlistentry>
+		<term><command><option>alias</option></command></term>
+		<listitem>
+			Use this to create aliases of variables. The first argument is the new name, the second the old name, and the other arguments are passed on to the variable. Example: If you want to use $alpha instead of ${beta gamma delta} then you have to write the following: alias alpha beta gamma delta . PS: Instead of creating an alias in the config you can also use environment variables. Example: Start conky like this: alpha="beta gamma delta" conky
+			<para></para></listitem>
+	</varlistentry>
+
 	<varlistentry>
 		<term><command><option>alignment</option></command></term>
 		<listitem>

doc/conky.1

@@ -145,6 +145,10 @@ and you can find the sample config file there (/etc/conky/conky.conf).
 .PP
 You might want to copy it to $HOME/.conkyrc and then start modifying it.
 Other configs can be found at http://conky.sf.net/
+.TP 
+\fB\*(T<\fBalias\fR\*(T>\fR
+Use this to create aliases of variables. The first argument is the new name, the second the old name, and the other arguments are passed on to the variable. Example: If you want to use $alpha instead of ${beta gamma delta} then you have to write the following: alias alpha beta gamma delta . PS: Instead of creating an alias in the config you can also use environment variables. Example: Start conky like this: alpha="beta gamma delta" conky
+
 .TP 
 \fB\*(T<\fBalignment\fR\*(T>\fR
 Aligned position on screen, may be top_left, top_right, top_middle, bottom_left, bottom_right, bottom_middle, middle_left, middle_right, or none (also can be abreviated as tl, tr, tm, bl, br, bm, ml, mr)

extras/nano/conky.nanorc

@@ -5,7 +5,7 @@
 syntax "conky" "(\.*conkyrc.*$|conky.conf)"
 
 ## Configuration items
-color green "\<(alignment|background|show_graph_range|show_graph_scale|border_margin|border_width|color0|color1|color2|color3|color4|color5|color6|color7|color8|color9|default_color|default_shade_color|default_shadecolor|default_outline_color|default_outlinecolor|imap|pop3|mpd_host|mpd_port|mpd_password|music_player_interval|sensor_device|cpu_avg_samples|net_avg_samples|double_buffer|override_utf8_locale|draw_borders|draw_graph_borders|draw_shades|draw_outline|out_to_console|out_to_stderr|out_to_x|overwrite_file|append_file|use_spacer|use_xft|font|xftalpha|xftfont|use_xft|gap_x|gap_y|mail_spool|minimum_size|maximum_width|no_buffers|template0|template1|template2|template3|template4|template5|template6|template7|template8|template9|top_cpu_separate|short_units|pad_percents|own_window|own_window_class|own_window_title|own_window_transparent|own_window_colour|own_window_hints|own_window_type|stippled_borders|temp1|temp2|update_interval|total_run_times|uppercase|max_specials|max_user_text|text_buffer_size|max_port_monitor_connections)\>"
+color green "\<(alias|alignment|background|show_graph_range|show_graph_scale|border_margin|border_width|color0|color1|color2|color3|color4|color5|color6|color7|color8|color9|default_color|default_shade_color|default_shadecolor|default_outline_color|default_outlinecolor|imap|pop3|mpd_host|mpd_port|mpd_password|music_player_interval|sensor_device|cpu_avg_samples|net_avg_samples|double_buffer|override_utf8_locale|draw_borders|draw_graph_borders|draw_shades|draw_outline|out_to_console|out_to_stderr|out_to_x|overwrite_file|append_file|use_spacer|use_xft|font|xftalpha|xftfont|use_xft|gap_x|gap_y|mail_spool|minimum_size|maximum_width|no_buffers|template0|template1|template2|template3|template4|template5|template6|template7|template8|template9|top_cpu_separate|short_units|pad_percents|own_window|own_window_class|own_window_title|own_window_transparent|own_window_colour|own_window_hints|own_window_type|stippled_borders|temp1|temp2|update_interval|total_run_times|uppercase|max_specials|max_user_text|text_buffer_size|max_port_monitor_connections)\>"
 
 ## Configuration item constants
 color yellow "\<(above|below|bottom_left|bottom_right|bottom_middle|desktop|dock|no|none|normal|override|skip_pager|skip_taskbar|sticky|top_left|top_right|top_middle|middle_left|middle_right|undecorated|yes)\>"

extras/vim/syntax/conkyrc.vim

@@ -13,6 +13,7 @@ endif
 syn region ConkyrcComment start=/^\s*#/ end=/$/
 
 syn keyword ConkyrcSetting
+			\ alias
 			\ alignment
 			\ background
 			\ show_graph_scale

src/conky.c

@@ -2795,9 +2795,10 @@ static int extract_variable_text_internal(struct text_object *retval, const char
 				s = p;
 
 				var = getenv(buf);
+				if (var) {
+					strncpy(buf, var, 255);
+				}
 
-				/* if variable wasn't found in environment, use some special */
-				if (!var) {
 				char *tmp_p;
 				char *arg = 0;
 
@@ -2827,7 +2828,7 @@ static int extract_variable_text_internal(struct text_object *retval, const char
 				if (obj != NULL) {
 					append_object(retval, obj);
 				}
-				}
+
 				continue;
 			} else {
 				obj = create_plain_text("$");
@@ -7230,6 +7231,25 @@ static void load_config_file(const char *f)
 			}
 		}
 
+		CONF("alias") {
+			if (value) {
+				char *skey, *svalue, *oldvalue;
+				if (sscanf(value, "%a[0-9a-zA-Z_] %a[^\n]", &skey, &svalue) == 2) {
+					oldvalue = getenv(skey);
+					if(oldvalue == NULL) {
+						setenv(skey, svalue, 0);
+						free(skey);
+						free(svalue);
+					}
+					//PS: Don't free oldvalue, it's the real envvar, not a copy
+				} else {
+					CONF_ERR;
+				}
+			} else {
+				CONF_ERR;
+			}
+		}
+
 		else {
 			ERR("%s: %d: no such configuration: '%s'", f, line, name);
 		}