show relative line numbering when jumping

Co-authored-by: Darukutsu <darupeter@pm.me>
Closes: https://github.com/jarun/nnn/pull/1804
Closes: https://github.com/jarun/nnn/discussions/1708

patches/namefirst/mainline.diff

@@ -71,9 +71,9 @@ index f8a2c58..9802a1f 100644
  }
  
  static off_t get_size(off_t size, off_t *pval, int comp)
-@@ -4134,33 +4141,7 @@ static uchar_t get_color_pair_name_ind(const struct entry *ent, char *pind, int
+@@ -4228,38 +4235,13 @@ static void printent(int pdents_index, uint_t namecols, bool sel)
- static void printent(const struct entry *ent, uint_t namecols, bool sel)
  {
+ 	const struct entry *ent = &pdents[pdents_index];
  	char ind = '\0';
 -	int attrs;
 -
@@ -99,14 +99,19 @@ index f8a2c58..9802a1f 100644
 -		if (attrs)
 -			attroff(attrs);
 -	}
--
++	int attrs = 0, namelen;
+ 
+ 	if (g_state.showlines) {
+ 		ptrdiff_t rel_num = pdents_index - cur;
+ 		printw(rel_num == 0 ? "%4td" : "%+4td", rel_num);
+ 	}
+ 
 -	attrs = 0;
 -
-+	int attrs = 0, namelen;
  	uchar_t color_pair = get_color_pair_name_ind(ent, &ind, &attrs);
  
  	addch((ent->flags & FILE_SELECTED) ? '+' | A_REVERSE | A_BOLD : ' ');
-@@ -4185,15 +4166,40 @@ static void printent(const struct entry *ent, uint_t namecols, bool sel)
+@@ -4284,15 +4266,40 @@ static void printent(int pdents_index, uint_t namecols, bool sel)
  		++namecols;
  
  #ifndef NOLC
@@ -149,8 +154,8 @@ index f8a2c58..9802a1f 100644
 +		attroff(attrs);
  }
  
- static void savecurctx(char *path, char *curname, int nextctx)
+ /**
-@@ -6356,26 +6362,19 @@ static void statusbar(char *path)
+@@ -6527,26 +6534,19 @@ static void statusbar(char *path)
  	tocursor();
  }
  

patches/restorepreview/mainline.diff

@@ -10,13 +10,13 @@ diff --git a/src/nnn.c b/src/nnn.c
 index 0388b23c..66d3316a 100644
 --- a/src/nnn.c
 +++ b/src/nnn.c
-@@ -390,7 +390,8 @@ typedef struct {
+@@ -391,7 +391,8 @@ typedef struct {
- 	uint_t uidgid     : 1;  /* Show owner and group info */
  	uint_t usebsdtar  : 1;  /* Use bsdtar as default archive utility */
  	uint_t xprompt    : 1;  /* Use native prompt instead of readline prompt */
--	uint_t reserved   : 4;  /* Adjust when adding/removing a field */
+ 	uint_t showlines  : 1;  /* Show line numbers */
+-	uint_t reserved   : 3;  /* Adjust when adding/removing a field */
 +	uint_t previewer  : 1;  /* Run state of previewer */
-+	uint_t reserved   : 3;  /* Adjust when adding/removing a field */
++	uint_t reserved   : 2;  /* Adjust when adding/removing a field */
  } runstate;
  
  /* Contexts or workspaces */

src/nnn.c

@@ -390,7 +390,8 @@ typedef struct {
 	uint_t uidgid     : 1;  /* Show owner and group info */
 	uint_t usebsdtar  : 1;  /* Use bsdtar as default archive utility */
 	uint_t xprompt    : 1;  /* Use native prompt instead of readline prompt */
-	uint_t reserved   : 4;  /* Adjust when adding/removing a field */
+	uint_t showlines  : 1;  /* Show line numbers */
+	uint_t reserved   : 3;  /* Adjust when adding/removing a field */
 } runstate;
 
 /* Contexts or workspaces */
@@ -4223,8 +4224,9 @@ static uchar_t get_color_pair_name_ind(const struct entry *ent, char *pind, int
 	return C_UND;
 }
 
-static void printent(const struct entry *ent, uint_t namecols, bool sel)
+static void printent(int pdents_index, uint_t namecols, bool sel)
 {
+	const struct entry *ent = &pdents[pdents_index];
 	char ind = '\0';
 	int attrs;
 
@@ -4251,6 +4253,11 @@ static void printent(const struct entry *ent, uint_t namecols, bool sel)
 			attroff(attrs);
 	}
 
+	if (g_state.showlines) {
+		ptrdiff_t rel_num = pdents_index - cur;
+		printw(rel_num == 0 ? "%4td" : "%+4td", rel_num);
+	}
+
 	attrs = 0;
 
 	uchar_t color_pair = get_color_pair_name_ind(ent, &ind, &attrs);
@@ -6559,7 +6566,7 @@ static void draw_line(int ncols)
 
 	move(2 + last - curscroll, 0);
 	macos_icons_hack();
-	printent(&pdents[last], ncols, FALSE);
+	printent(last, ncols, FALSE);
 
 	if (g_state.oldcolor && (pdents[cur].flags & DIR_OR_DIRLNK)) {
 		if (!dir)  {/* First file is not a directory */
@@ -6573,7 +6580,7 @@ static void draw_line(int ncols)
 
 	move(2 + cur - curscroll, 0);
 	macos_icons_hack();
-	printent(&pdents[cur], ncols, TRUE);
+	printent(cur, ncols, TRUE);
 
 	/* Must reset e.g. no files in dir */
 	if (dir)
@@ -6698,7 +6705,7 @@ static void redraw(char *path)
 		if (len)
 			findmarkentry(len, &pdents[i]);
 
-		printent(&pdents[i], ncols, i == cur);
+		printent(i, ncols, i == cur);
 	}
 
 	/* Must reset e.g. no files in dir */
@@ -7251,13 +7258,20 @@ nochange:
 		case SEL_HOME: // fallthrough
 		case SEL_END: // fallthrough
 		case SEL_FIRST: // fallthrough
-		case SEL_JUMP: // fallthrough
 		case SEL_YOUNG:
 			if (ndents) {
 				g_state.move = 1;
 				handle_screen_move(sel);
 			}
 			break;
+		case SEL_JUMP:
+			if (ndents) {
+				g_state.showlines = 1;
+				redraw(path);
+				handle_screen_move(sel);
+				g_state.showlines = 0;
+			}
+			break;
 		case SEL_CDHOME: // fallthrough
 		case SEL_CDBEGIN: // fallthrough
 		case SEL_CDLAST: // fallthrough