OpenEuphoria

1. Blast from the past - "prefix macros" for ed.ex by Mike Nelson

• Posted by K_D_R Nov 20, 2012
• 1888 views

Super Star Euphoria Programmer Mike Nelson wrote this very powerful little routine which is kind of like the .commands in the Vi editor.

Essentially you can assign a series of actions to a label of your choice. When you want to execute the commands you type a semi-colon followed by the label and then hit the space bar. The label is erased together with the prefixed semi-colon and then the commands are executed. The possibilities are endless.

 
-- enter the following routine immediately before the procedure try_auto_complete(char key) 
function prefix_macro()  --  Mike Nelson  10/14/2000                                           
   sequence this_line, macro                                                                   
   integer count,index,c                                                                       
                                                                                               
   this_line=buffer[b_line]                                                                    
   count=0 index=1                                                                             
   for i=b_col-1 to 1 by -1 do                                                                 
      c=this_line[i]                                                                           
      if not ((c>='a' and c<='z') or (c>='A' and c<='Z')                                       
      or (c>='0' and c<='9') or c=';') then                                                    
         if count<2 then return 0 end if                                                       
         index=i+1                                                                             
         exit                                                                                  
      end if                                                                                   
      count+=1                                                                                 
   end for                                                                                     
                                                                                               
   if this_line[index]!=';' then                                                               
    return 0                                                                                   
   end if                                                                                      
                                                                                               
    macro=this_line[index+1..index+count-1] 
   add_queue(repeat(BS,length(macro)+1))                                                  
                                                                                               
 --  insert the labels and commands you write in the following list of elsif clauses: 
 --  I have included several examples to get you started. 
                                                                                              
    if equal(macro, "mc") then                                                                 
     -- a macro to enter macros                                                                
        add_queue(HOME & "\telsif equal(macro,\"\") then" & CR & "\tadd_queue(\"\")"           
                    & END & repeat(BS, 4)                                                      
                    & ARROW_UP & HOME & END                                                    
                    & repeat(ARROW_LEFT,7))                                                    
                                                                                               
    elsif equal(macro,"aq") then                                                               
        -- add_queue, a macro to enter macros                                                  
        -- in case another "add-queue" line is needed                                          
        add_queue( END & CR & HOME & "\t\tadd_queue(\"\")"                                     
        & repeat(ARROW_LEFT,2)) 
 
        elsif equal(macro, "c") then   -- compile the current file 
	shell("euc " & file_name) 
	add_queue(CONTROL_B & CONTROL_T)         
     
    elsif equal(macro,"il") then    -- shroud the current file 
	shell("eushroud " & file_name) 
	add_queue(CONTROL_B & CONTROL_T)         
	     
    elsif equal(macro,"b") then     -- bind the current file 
	shell("eubind " & file_name) 
	add_queue(CONTROL_B & CONTROL_T)         
	 
    elsif equal(macro, "mlc") then                                                             
	add_queue("/*  */" & repeat(ARROW_LEFT,3))                                          
	 
    elsif equal(macro, "sq") then                                                            
	add_queue("\' \'" & repeat(ARROW_LEFT,2))                                           
	 
    elsif equal(macro, "dq") then                                                            
	add_queue("\" \"" & repeat(ARROW_LEFT,2))                                           
	 
    elsif equal(macro, "bt") then                                                             
	add_queue("` `" & repeat(ARROW_LEFT,2))       
 
       else 
	return 0 
    end if 
    return 1 
end function 
                         
-- next insert prefix macro code in the  
procedure try_auto_complete(char key) 
    -- check for a keyword that can be automatically completed 
    sequence word, 
    this_line, white_space, leading_white, begin 
    natural first_non_blank, wordnum 
    
-- insert this code:  
    if prefix_macro() then              -- for the prefix_macro routine 
	return 
    end if 
------------------------------ 
     

And you are set to go!

Kenneth Rhodes

3. There is more than one way to skin a cat

• Posted by K_D_R Nov 22, 2012
• 1747 views

  
--note that this prefix macro code: 
elsif equal(macro, "il") then 
       shell("eushroud " & file_name) 
	normal_video() 
	goto_line(0, b_col)  -- refresh screen 
 
-- does the same thing as this code: 
elsif equal(macrol, "il") then 
      add_queue(ESCAPE & "d" & " eushroud " & file_name & CR) 
 
-- and this code: 
    elsif equal(macro,"il") then    -- shroud the current file  
	shell("eushroud " & file_name)  
	add_queue(CONTROL_B & CONTROL_T)          
 
------------------------------------------------------------- 
 
-- if you choose to add a hot-key shell command   
-- to the get-escape elsif clauses, to execute a shell command 
-- you can avoid adding the calling command letter to the list  
-- of hot-keys by choosing the second method above: 
 
    elsif command[1] = 'S' then 
      add_queue(ESCAPE & "d" & " eushroud " & file_name & CR)  -- note the final CR 
 
-- one advantage of using a prefix-macro instead of ESCAPE + hotkey 
-- is that the prefix macro calling command or label can be multiple letters 
-- allowing for a more "readable" or easy to remember mnemonic code: 
--   ;il may be easier to associate with shroud than the "S".  
 
-- perhaps a better example - in my original post for multi-line quotes 
-- I chose the prefix macro latel "bt" for back- tick, but "mlq" might be easier to remember: 
 
     elsif equal(macro, "mlq") then  -- called by entering ";mlq ", 5 keystrokes                                                            
	add_queue("` `" & repeat(ARROW_LEFT,2)) 
 
-- on the other hand, you can assign a symbol as an ESCAPE hot-key 
-- such as: 
 
   elsif command [1] = '^' then  -- '^' will not have to be added to the list of hot-keys 
   add_queue(ESCAPE & "d" & " eushroud " & file_name & CR)  -- because of the final CR. 
 
------------------------------------------------ 
 
-- Prefix macro's allow you to use multiple mnemoinic calling characters.  
-- ESCAPE hot-keys are limited to one character or symbol.  
-- In addition to being easier to remember, prefix macros  
-- allow you to keep your fingers closer to the home-keys.  
 
-- ESCAPE hot-keys are somewhat constrained to a fix number of single letters or symbols. 
-- However, you can add additional menu's which would allow you to re-use letter or symbols, 
-- but that would involve more key-strokes. 
 
-- Prefix macros are very good to use to save key strokes 
-- when entering longer commands which are used frequently: 
 
   elsif equal(macro,"ri") then                                                               
        add_queue("routine_id(\"\")" & repeat(ARROW_LEFT,2))  
    
   elsif equal(macro,"pf") then                                                               
        add_queue("printf(STDOUT,\"\", )" & repeat(ARROW_LEFT,4)) 
---------------------------------------------------------------- 
 
-- this little prefix macro might be useful if you have a  
-- long string of code which extends beyond the width of your screen.  
-- It basically executes a CR at the beginning of the last word within  
-- the width of the screen: 
 
    elsif equal(macro,"rm") then                                                               
        -- cuts right margin to format long lines                                        
        add_queue(HOME & repeat(ARROW_RIGHT, screen_width) & CONTROL_L & CR) 
 

5. Re: db_open on steroids !

• Posted by K_D_R Nov 30, 2012
• 1601 views

-- I think this is a little improvement over the code listed in the previous post 
 
-- The code block written is the same as the test code.  Essentially, the macro combines 
-- db_select, db_open, & db_create. 
 
-- I added a variable for facilitate testing the LOCK_METHOD, 
-- so the assignment statements at the top of the prefix_macro routine 
-- now looks like this: 
sequence lock_method ={}  
    object  current_dir_db = dir("*.edb")  
    sequence tmp = {}  
    integer lm = 0 
------------------------------------------------------------------------ 
------------------------------------------------------------------------ 
 elsif equal(macro,"dbo") then 
	-- select/open/create euphoria database 
	 
        set_top_line("Select/Open/Create Database: ") 
	text_color(TOP_LINE_TEXT_COLOR) 
	 
	if equal(current_dir_db, -1) then 
		current_dir_db = trim(key_gets("", {})) 
	else  
	    for i = 1 to length(current_dir_db) do 
		tmp = update_history(tmp, sprintf("%s", {current_dir_db[i][D_NAME]})) 
	    end for 
	    current_dir_db = trim(key_gets("",tmp)) 
	end if 
	 
	set_top_line("Database lock method =  ") 
	text_color(TOP_LINE_TEXT_COLOR) 
	lock_method = trim(key_gets(" ",{"DB_LOCK_SHARED", "DB_LOCK_EXCLUSIVE", "DB_LOCK_NO"})) 
	if equal(lock_method, "DB_LOCK_SHARED") then 
	    lm = DB_LOCK_SHARED 
	elsif equal(lock_method, "DB_LOCK_EXCLUSIVE") then 
	    lm = DB_LOCK_EXCLUSIVE 
	else 
	    lm = DB_LOCK_NO 
	end if 
	 
	-- test 
	if db_select(sprintf("%s", {current_dir_db}), lm) != DB_OK then 
	    if db_open(sprintf("%s", {current_dir_db}), lm) != DB_OK then 
	      if db_create(sprintf("%s", {current_dir_db}), lm) != DB_OK then 
		set_top_line(" ") 
		text_color(TOP_LINE_TEXT_COLOR) 
		any_key("Could not Select/open/create db!")  
	      end if     
	    end if   
	end if 
	-- end test 
	 
	-- write code block 
        add_queue(repeat(BS,length(macro)+1))  -- erase calling macrol label 
	add_queue("\nif db_select(\"" & sprintf("%s", {current_dir_db}) & "\","  
		& sprintf("%s", {lock_method}) & ") != DB_OK then " 
		    & "\n\tif db_open(\"" & sprintf("%s", {current_dir_db}) & "\","  
		    & sprintf("%s", {lock_method}) & ") != DB_OK then" 
			& "\n\tif db_create(\"" & sprintf("%s", {current_dir_db}) & "\","  
			& sprintf("%s", {lock_method}) & ") != DB_OK " 
		    & ARROW_DOWN & "\tend if" & ARROW_DOWN 
		    & "\tend if" & CR & BS & END & CR) 
	 
	normal_video()                -- refresh 
	goto_line(0, b_col)           -- screen   
	 
 
-- comments & suggestions for improvements will be appreciated!