navigation.cpp

//2018201005 Vatsal Soni
#include "config.h"

int row=1,col=0,cur_cursor=1,n;
//struct dirent **namelist;
#define esc 27	// ASCII code of ESC
#define pos() printf("%c[%d;%dH",esc,row,col)	// For cursor move to specified pos.
#define pos1(point) printf("%c[%d;%dH",esc,point,col)	// For cursor move to end of line
#define cls printf("\033[H\033[J")	//For clear screen
struct dirent **namelist;

// For normal mode navigation utility
int navigate(int n1,struct dirent **namelist1,struct termios newrsettings,struct termios initialrsettings,string root)
{
	char *path;
	char ch;
	n=n1;
	stack<string> backstk,forstk;	//backward stack and forward stack
	namelist=namelist1;
	struct winsize w;	// To get terminal property
    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
	string current=root,display="Normal Mode";	//current string to store current directory and root for root directory
	backstk.push(root);
	do
	{
		int last_cursor_point=w.ws_row;
		pos1(last_cursor_point);
		cout<<display;
		pos();
		ch=cin.get();	// when user press key like up/down/left/right/enter/backspace/h
	    if(ch==27)
	    {
	    	ch=cin.get();
            ch=cin.get();
            if(ch=='A')   // If up arrow key 
            {
                --row;
                if(row>=1)    // If cursor is not present at first position
                    pos();	// set cursor position
                else if(cur_cursor>1 && row<1) // If cursor is at first position and current is not at first window.
                {
                	cls;	// clear screen
                	cur_cursor--;	//set window position
                	if(current==root)
		            {
		            	path=new char[root.length()+1];
		            	strcpy(path,root.c_str());
		            	int n1;
		            	//n = scandir(path, &namelist, NULL,alphasort);
		            	if(n+1<=w.ws_row-2)
		            		n1=n;
		            	else
		            		n1=w.ws_row-2;
		            	/*for(int i=0;i<n-1;i++)
		            	{
		            		if(string(namelist[i]->d_name)=="..")
		            		{
		                		int x=i;
	                			while(x<n-1)
	                			{
	                    			namelist[x]=namelist[x+1];
	                    			x++;
	                			}
	                			i--;
	                			break;
		                	}
		            	}
		            	n--;*/
		            	for(int i=cur_cursor-1;i<=cur_cursor+n1-1;i++)
		            	{
		            		fileInfo(path,namelist[i]->d_name,0);
		            	}
		            }
		            else
		            {
		            	string s=current;
		            	path=new char[s.length()+1];
		            	strcpy(path,s.c_str());	
		            	int n1;
		            	//n = scandir(path, &namelist, NULL,alphasort);
		            	if(n<=w.ws_row-2)
		            		n1=n;
		            	else
		            		n1=w.ws_row-2;
		            	for(int i=cur_cursor-1;i<=cur_cursor+n1-1 && i<n;i++)
		            	{		
		            		fileInfo(path,namelist[i]->d_name,0);
		            	}
		            }
		            //printDirectoryList(current,root);
		            row=1;
		            pos();	//set cursor position
                }
                else		// If cursor is at first position and current window is first only.
                	row=1;
                //cout<<row<<"  "<<cur_cursor;
            }
            else if(ch=='B')  // If down arrow key 
            {
            	
    			//printf ("lines %d\n", w.ws_row);	Terminal height
    			//printf ("columns %d\n", w.ws_col);	Terminal width
                row++;
                //cout<<row;
                if(cur_cursor+row<=n+2 && row<=w.ws_row-1)  // if cursor is not at last position
                	pos();
                else if(row>w.ws_row-1 && cur_cursor+row<=n+2) // if cursor is at last position and cursor is not at last window.
                {
                	cls;	//clear screen                	
                	if(root==current)
		            {
		            	path=new char[root.length()+1];
		            	strcpy(path,root.c_str());
		            	int n1;
		            	//n = scandir(path, &namelist, NULL,alphasort);//store all files and dirctories into namelist from specified path
		            	if(n+1<=w.ws_row-2)
		            		n1=n;
		            	else
		            		n1=w.ws_row-2;
		            	/*for(int i=0;i<n-1;i++)
		            	{
		            		if(string(namelist[i]->d_name)=="..")
		            		{
		                		int x=i;
	                			while(x<n-1)
	                			{
	                    			namelist[x]=namelist[x+1];
	                    			x++;
	                			}
	                			i--;
	                			break;
		                	}
		            	}
		            	n=n-2;*/
		            	for(int i=cur_cursor;i<=cur_cursor+n1;i++)
		            	{
		            		fileInfo(path,namelist[i]->d_name,0);
		            	}	
		            }
		            else
		            {
		            	string s=current;
		            	path=new char[s.length()+1];
		            	strcpy(path,s.c_str());	
		            	int n1;
		            	//n = scandir(path, &namelist, NULL,alphasort);//store all files and dirctories into namelist from specified path
		            	
		            	if(n+1<=w.ws_row-2)
		            		n1=n;
		            	else
		            		n1=w.ws_row-2;
		            	for(int i=cur_cursor;i<=cur_cursor+n1;i++)
		            	{		
		            		fileInfo(path,namelist[i]->d_name,0);
		            	}
		            }
                	cur_cursor++;	//set window position
                	row--;
                	pos();	//set cursor position
                }
                else	// if cursor is at last position and also at last window.
                	row--;
            }
            else if(ch=='C')  // If right arrow key then DS
            {
                if(forstk.size()>=1)
             	{
             		backstk.push(forstk.top());
             		string s=forstk.top();
             		cls;	// clear screen
             		forstk.pop();
             		char *s_ar=new char[s.length()+1];
	    			strcpy(s_ar,s.c_str());
	    			DIR *d=opendir(s_ar);
	    			if(!d)
	    			{
	    				// Nothing should happen	
	    			}
	    			else
	    			{
	    				current=s;
	    			}
	    			//char *root1=new char[s.length()+1];
	    			//strcpy(root1,s.c_str());
	    			//n = scandir(root1, &namelist, NULL,alphasort);
	    			printDirectoryList(current,root);	// Print directory and files
            		cur_cursor=1;
            		row=1;
            		pos();
             	}
            }
            else if(ch=='D')  // If left arrow key then DS
            {
             	if(backstk.size()>=2)
             	{
             		forstk.push(backstk.top());
             		cls;
             		backstk.pop();
	    			string s=backstk.top();
	    			char *s_ar=new char[s.length()+1];
	    			strcpy(s_ar,s.c_str());
	    			DIR *d=opendir(s_ar);
	    			if(!d)
	    			{
	    				// Nothing should happen
	    			}
	    			else
	    				current=s;
	    			//char *root1=new char[s.length()+1];
	    			//strcpy(root1,s.c_str());
	    			//n = scandir(root1, &namelist, NULL,alphasort);	
	    			printDirectoryList(current,root);	// Print directory and files
            		cur_cursor=1;
            		row=1;
            		pos();
             	}
            }
	    }
	    else if(ch==104 || ch==72)   // If h or H press then open root directory
	    {
	    	if(current!=root)
	    	{
	    		cls;
		    	cur_cursor=1;
		    	backstk.push(root);

		    	while(!forstk.empty()){
		    		forstk.pop();
		    	}
		    	current=root;
		    	searchResult.clear();
	           	printDirectoryList(current,root);	// Print directory and files
	            row=1;
	            pos();
	            cur_cursor=1;
	    	}
	    }
	    else if(ch==127)  // If BackSpace key then 
	    {
	    	if(current!=root && searchResult.size()==0)
	    	{
	    		while(!forstk.empty())
	    			forstk.pop();
	    		cur_cursor=1;
	    		int f=current.find_last_of("/\\");
	    		current=current.substr(0,f);
		    	cls;
		        backstk.push(current);
	            printDirectoryList(current,root);	// Print directory and files
	            row=1;
	            pos();
	            cur_cursor=1;
	    	}	    	
	    }
	    else if(ch==58)  // If colon(:) then command mode
	    {
	    	row=w.ws_row;
	    	pos();
	    	printf("%c[2K", 27);
	    	cout<<":";
	    	//newrsettings.c_lflag &= ECHO;
	    	newrsettings=initialrsettings;
	    	newrsettings.c_lflag &= ~ICANON;	// change settings
    		tcgetattr(fileno(stdin), &newrsettings);
    		string getFromCommand=commandMode(w.ws_row,current,root);
    		printf("%c[2K", 27);
    		cls;
    		row=0;
    		cur_cursor=1;
    		pos();
    		newrsettings=initialrsettings;	
    		newrsettings.c_lflag &= ~ICANON;	// change settings
    		newrsettings.c_lflag &= ~ECHO;
			tcgetattr(fileno(stdin), &newrsettings);	// load newsettings
			if(getFromCommand!="")
			{
				if(getFromCommand=="$$")
				{
					//cout<<getFromCommand<<endl;
					backstk.push(current);
					printsearch();
				}
				else
				{
					current=getFromCommand;
					printDirectoryList(current,root);
				}
			}
			else
				printDirectoryList(current,root);		// Print directory and files
	    }
	    else if(ch==10)  // If enter key then open Dir or File
	    {
	    	if(searchResult.size()>0)
	    	{
				backstk.push(current);
	    		current=searchResult[cur_cursor+row-2];
	    		char *temp2=new char[current.length()+1];
	    		strcpy(temp2,current.c_str());
	    		struct stat statObj;
	    		if(stat(temp2,&statObj) < 0)   
		        {
		        	cout<<"Error";
		        	//return 1;
		        }
	    		if(!S_ISDIR(statObj.st_mode))
	    		{
	    			char *char_array;
		            string s=current;
		            char_array=new char[s.length()+1];
		            strcpy(char_array, s.c_str()); 
		            //system(char_array);
		            //int f=current.find_last_of("/\\");
		    		//current=current.substr(0,f);
		    		int st=open("/dev/null",O_WRONLY);
		    		dup2(st,2);
		    		close(st);
		    		pid_t pid=fork();
		    		if(pid==0)
		    		{
		    			execlp("xdg-open","xdg-open",char_array,NULL);
		    			exit(0);
		    		}
	    		}
	    		else
	    		{
	    			searchResult.clear();
	    			printDirectoryList(current,root);
	    		}
	    	}
	    	else
	    	{
	    		struct stat statObj;
		        string temp,temp1;
		        char *temp2;
		        if(string(namelist[cur_cursor+row-2]->d_name)=="..")
		        {
		        	while(!forstk.empty())
		    			forstk.pop();
		    		
		    		int f=current.find_last_of("/\\");
		    		current=current.substr(0,f);
		        	temp=current;
		        	backstk.push(temp);
		        	temp2=new char[temp.length()+1];
		        }
		        else if(string(namelist[cur_cursor+row-2]->d_name)!=".")
		        {
		        	temp="/";
		        	temp1=namelist[cur_cursor+row-2]->d_name;
		        	temp1=temp+temp1;
		        	temp=current+temp1;
		       		current=temp;		       		
		       		while(!forstk.empty())
		    			forstk.pop();
		        	
		        	temp2=new char[current.length()+1];
		        	backstk.push(current);  	
		        }
		        else
		        {
		        	continue;
		        }
		        strcpy(temp2,current.c_str());
		        if(stat(temp2,&statObj) < 0)   
		        {
		        	cout<<"Error";
		        	//return 1;
		        } 
		        if(!S_ISDIR(statObj.st_mode))
		        {	
		            char *char_array;
		            //string s="bash -c 'xdg-open "+ temp +"' 2> /dev/null";
		            string s=temp;
		            char_array=new char[s.length()+1];
		            strcpy(char_array, s.c_str()); 
		            //system(char_array);
		            int f=current.find_last_of("/\\");
		    		current=current.substr(0,f);
		    		backstk.pop();

		    		int st=open("/dev/null",O_WRONLY);
		    		dup2(st,2);
		    		close(st);
		    		pid_t pid=fork();
		    		if(pid==0)
		    		{
		    			execlp("xdg-open","xdg-open",char_array,NULL);
		    			exit(0);
		    		}
		        }
		        else if(string(namelist[cur_cursor+row-2]->d_name)!=".")
		        {
		            cls;
		            cur_cursor=1;
		            printDirectoryList(current,root);	// Print directory and files
		            row=1;
		            pos();
		        }
	    	} 
	    }
	}while(ch!=81 && ch!=113);
	return 0;
}

void printDirectoryList(string current,string root) // For printing list of files and directories
{
	char *path=new char[current.length()+1];
    strcpy(path,current.c_str());
    int n1;
    struct winsize w;	//to get terminal property
    ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);    
	if(current==root)
    {
    	n = scandir(path, &namelist, NULL,alphasort);	//store all files and dirctories into namelist from specified path
    	//cout<<w.ws_row<<" "<<n;
    	if(n>0)
    	{
    		if((w.ws_row-n)==1)
    			n1=n-2;
	    	else if(n<=w.ws_row-2)
	    		n1=n-2;
	    	else
	    		n1=w.ws_row-2;
	    	for(int i=0;i<n-1;i++)
	    	{
	    		if(string(namelist[i]->d_name)=="..")
	    		{
	        		int x=i;
	    			while(x<n-1)
	    			{
	        			namelist[x]=namelist[x+1];
	        			x++;
	    			}
	    			i--;
	    			break;
	        	}
	    	}
	    	for(int i=0;i<=n1;i++)
	    	{
	    		fileInfo(path,namelist[i]->d_name,0);
	    	}
	    	n=n-2;
    	}
    	/*else
    	{
    		pos1(w.ws_row);
    		printf("%c[2K", 27);
			cout<<"No directory exist";	
    	}*/
    }
    else
    {
    	n = scandir(path, &namelist, NULL,alphasort);	//store all files and dirctories into namelist from specified path
    	if(n>0)
    	{
    		if(n<=w.ws_row-2)
	    		n1=n-1;
	    	else
	    		n1=w.ws_row-2;
	    	for(int i=0;i<=n1;i++)
	    	{		
	    		fileInfo(path,namelist[i]->d_name,0);
	    	}
	    	n--;
    	}
    	/*else
    	{
    		pos1(w.ws_row);
    		printf("%c[2K", 27);
			cout<<"No directory exist";	
    	}*/
    }
}
void printsearch()	// For printing search Result
{
	n=searchResult.size();
	int n1;
	/*if(n<=w.ws_row-2)
    	n1=n-1;
    else
    	n1=w.ws_row-2;*/
	n1=n-1;
    cls;
    cur_cursor=1;
	row=1;
	pos();
	//cout<<n;
    for(int i=0;i<=n1;i++)
    {		
    	int f=searchResult[i].find_last_of("/\\");
		string path=searchResult[i].substr(0,f);
		char *fpath=new char[path.length()+1];
		strcpy(fpath,path.c_str());
		char *fname=new char[searchResult[i].length()+1];
		strcpy(fname,searchResult[i].c_str());
    	fileInfo(fpath,fname,1);
    }
    n--;
 	//cout<<namelist[0]->d_name;   
}