layout: post title: "Vim Macros" subtitle: "and interrupt handling" tags: [osdev] ###The problem Today I was writing some code for handling interrupts. At one point I needed the following piece of code :::c extern void isr0(void), isr1(void), isr2(void), isr3(void), isr4(void), isr5(void), isr6(void), isr7(void), isr8(void), isr9(void), isr10(void), isr11(void), isr12(void), isr13(void), isr14(void), isr15(void), isr16(void), isr17(void), isr18(void), isr19(void), isr20(void), isr21(void), isr22(void), isr23(void), isr24(void), isr25(void), isr26(void), isr27(void), isr28(void), isr29(void), isr30(void), isr31(void), isr32(void), isr33(void), isr34(void), isr35(void), isr36(void), isr37(void), isr38(void), isr39(void), isr40(void), isr41(void), isr42(void), isr43(void), isr44(void), isr45(void), isr46(void), isr47(void); ###The solution Vim macros. I've been using this site and my rewrite of my operating system as an excuse to learn vim. And today it payed off. To write the above piece of code I used the key presses iisr0(void),0qayyp3la0q46@a47k48J$r;Iextern void Couldn't be easier! OK, so maybe it could... Let's break it down. Let's start with iisr0(void), _i_ puts vim in Insert mode. There we write _isr0(void),_ and finally leave Insert mode with the escape key. Next is _0_ to bring the pointer to the beginning of the line. Then comes the macro. qayyp3la0q _qa_ starts recording a macro into register a. _yyp_ yanks the current line and pastes it below. _3l_ skips over the i, s and r. Ctrl+a increases the number under the pointer by one. Finally _0_ goes back to the beginning of the line and _q_ stops the macro recording. The next part: 46@a47k48J runs the macro 46 times, steps up 47 times and joins the current line with the next 48 times. We now have :::c isr0(void), isr1(void), isr2(void), isr3(void), isr4(void), isr5(void), isr6(void), isr7(void), isr8(void), isr9(void), isr10(void), isr11(void), isr12(void), isr13(void), isr14(void), isr15(void), isr16(void), isr17(void), isr18(void), isr19(void), isr20(void), isr21(void), isr22(void), isr23(void), isr24(void), isr25(void), isr26(void), isr27(void), isr28(void), isr29(void), isr30(void), isr31(void), isr32(void), isr33(void), isr34(void), isr35(void), isr36(void), isr37(void), isr38(void), isr39(void), isr40(void), isr41(void), isr42(void), isr43(void), isr44(void), isr45(void), isr46(void), and all we need to do now is replace the last comma with a semicolon using _$r;_ and insert _extern void_ at the beginning of the line using _I_. ###Another example of macros Starting with :::nasm INTNOERR 0 I used qayypcwINTNOERR$a0q qsyypcwINTERR$a0q dd6@a@s@a5@s33@a and ended up with :::nasm INTNOERR 0 INTNOERR 1 INTNOERR 2 INTNOERR 3 INTNOERR 4 INTNOERR 5 INTNOERR 6 INTNOERR 7 INTERR 8 INTNOERR 9 INTERR 10 INTERR 11 INTERR 12 INTERR 13 INTERR 14 INTNOERR 15 ... INTNOERR 45 INTNOERR 46 I love vim! ###Application So where did I use this? I've been writing some code for handling interrupts in the os. You can find it in Git commit [26dd8e4c75](https://github.com/thomasloven/os5/tree/26dd8e4c7507b66e4f94bf2c4e980265c6f0a20b).