lazyrepl.d

import std;
enum string compiler="dmd -unittest -main -run ";
enum string printer="bat --color=always ";
void append(string file,string line){
	exe("echo \""~line~"\" >> "~file); 
}
void exe(string s)=>executeShell(s).output.writeln;
void delete_(string file,int linestart,int lineend){
	auto source=File(file,"r").byLineCopy.array;
	File sink=File(file~"temp","w");
	if(linestart==-999){
		linestart=cast(int)source.length;
		lineend=linestart;
	}
	if(linestart<0){
		linestart+=source.length-1;
	}
	if(lineend<0){
		lineend+=source.length-1;
	}
	foreach(i,s;source){
		if(i+1<linestart || i+1>lineend){
			//s.writeln;
			sink.writeln(s);
	}}
	//exe("rm "~file~"backup");
	exe("mv -f "~file~" "~file~"backup");
	exe("mv -f "~file~"temp "~file);
}
int toint(string s){
	try{
		return s.to!int;
	}
	catch(Throwable){
		return -1;
}}
void main(string[] file){
	assert(file.length==2,"pls select file");
	string input;
	bool lastlineempty=false;
	while(true){
		if( ! lastlineempty){
			exe(printer~file[1]);
		}
		input=readln[0..$-1];
		if(input=="quit"){
			return;
		} else { if(input==""&& ! lastlineempty){
			lastlineempty=true;
		} else { if(input==""&& lastlineempty){
			exe(compiler~file[1]);
			lastlineempty=false;
			"press enter to continue".writeln;
			readln;
		} else { if(input[0]=='d'){
			if(input=="d"){
				delete_(file[1],-999,-999);
			} else {
				auto i=input.indexOf("..");
				if(i==-1){
					int j=input[1..$].toint;
					delete_(file[1],j,j);
				} else {
					delete_(file[1],input[1..i].toint,input[i+2..$].toint);
				}
			}
		} else {
			if(lastlineempty){
				lastlineempty=false;
				append(file[1],"");
			}
			append(file[1],input);
		}}}}
	}
}