shithub: vdiff

Download patch

ref: dbb671ecef53dad19cb42f61dfe782e65ca9be68
author: phil9 <telephil9@gmail.com>
date: Mon Feb 1 03:39:53 EST 2021 

initial import


--- /dev/null
+++ b/README
@@ -1,0 +1,3 @@
+A git/diff output viewer.
+
+Usage: git/diff |vdiff
--- /dev/null
+++ b/mkfile
@@ -1,0 +1,8 @@
+</$objtype/mkfile
+
+BIN=$home/bin/$objtype
+CFLAGS=-FTVw
+TARG=vdiff
+OFILES=vdiff.$O
+
+</sys/src/cmd/mkone
--- /dev/null
+++ b/vdiff.c
@@ -1,0 +1,237 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <keyboard.h>
+#include <bio.h>
+
+typedef struct Line Line;
+
+struct Line {
+	int t;
+	char *s;
+};
+
+enum
+{
+	Lfile = 0,
+	Lsep,
+	Ladd,
+	Ldel,
+	Lnone,
+	Ncols,
+};	
+
+enum
+{
+	Scrollwidth = 12,
+	Scrollgap = 2,
+	Margin = 8,
+	Hpadding = 4,
+	Vpadding = 2,
+};
+
+Rectangle sr;
+Rectangle scrollr;
+Rectangle scrposr;
+Rectangle listr;
+Rectangle textr;
+Image *cols[Ncols];
+Image *scrollbg;
+int lineh;
+int nlines;
+int offset;
+Line **lines;
+int lsize;
+int lcount;
+
+void
+drawline(Rectangle r, Line *l)
+{
+	Image *bg;
+	Point p;
+	char *s;
+
+	bg = cols[l->t];
+	draw(screen, r, bg, nil, ZP);
+	p = Pt(r.min.x + Hpadding, r.min.y + (Dy(r)-font->height)/2);
+	for(s = l->s; *s; s++){
+		if(*s == '\t')
+			p = string(screen, p, display->black, ZP, font, "    ");
+		else
+			p = stringn(screen, p, display->black, ZP, font, s, 1);
+	}
+}
+
+void
+redraw(void)
+{
+	Rectangle lr;
+	int i, h, y;
+
+	draw(screen, sr, display->white, nil, ZP);
+	draw(screen, scrollr, scrollbg, nil, ZP);
+	if(lcount>0){
+		h = ((double)nlines/lcount)*Dy(scrollr);
+		y = ((double)offset/lcount)*Dy(scrollr);
+		scrposr = Rect(scrollr.min.x, scrollr.min.y+y, scrollr.max.x-1, scrollr.min.y+y+h);
+	}else
+		scrposr = Rect(scrollr.min.x, scrollr.min.y, scrollr.max.x-1, scrollr.max.y);
+	draw(screen, scrposr, display->white, nil, ZP);
+	for(i=0; i<nlines && offset+i<lcount; i++){
+		lr = Rect(textr.min.x, textr.min.y+i*lineh, textr.max.x, textr.min.y+(i+1)*lineh);
+		drawline(lr, lines[offset+i]);
+	}
+}
+
+void
+scroll(int off)
+{
+	if(off<0 && offset<=0)
+		return;
+	if(off>0 && offset+nlines>lcount)
+		return;
+	offset += off;
+	if(offset<0)
+		offset = 0;
+	if(offset+nlines>lcount)
+		offset = lcount-nlines+1;
+	redraw();
+}
+
+void
+eresized(int new)
+{
+	if(new && getwindow(display, Refnone)<0)
+		sysfatal("cannot reattach: %r");
+	sr = screen->r;
+	scrollr = sr;
+	scrollr.max.x = scrollr.min.x+Scrollwidth+Scrollgap;
+	listr = sr;
+	listr.min.x = scrollr.max.x;
+	textr = insetrect(listr, Margin);
+	lineh = Vpadding+font->height+Vpadding;
+	nlines = Dy(textr)/lineh;
+	offset = 0;
+	redraw();
+}
+
+void
+initcols(void)
+{
+	Rectangle cr;
+
+	cr = Rect(0, 0, 1, 1);
+	cols[Lfile] = allocimage(display, cr, screen->chan, 1, 0xefefefff);
+	cols[Lsep]  = allocimage(display, cr, screen->chan, 1, 0xeaffffff);
+	cols[Ladd]  = allocimage(display, cr, screen->chan, 1, 0xe6ffedff);
+	cols[Ldel]  = allocimage(display, cr, screen->chan, 1, 0xffeef0ff);
+	cols[Lnone] = display->white;
+	scrollbg    = allocimage(display, cr, screen->chan, 1, 0x999999ff);
+}
+
+int
+linetype(char *text)
+{
+	int type;
+
+	type = Lnone;
+	if(strncmp(text, "+++", 3)==0)
+		type = Lfile;
+	else if(strncmp(text, "---", 3)==0)
+		type = Lfile;
+	else if(strncmp(text, "@@", 2)==0)
+		type = Lsep;
+	else if(strncmp(text, "+", 1)==0)
+		type = Ladd;
+	else if(strncmp(text, "-", 1)==0)
+		type = Ldel;
+	return type;
+}
+
+Line*
+parseline(char *s)
+{
+	Line *l;
+
+	l = malloc(sizeof *l);
+	if(l==nil)
+		sysfatal("malloc: %r");
+	l->t = linetype(s);
+	l->s = s;
+	return l;
+}
+
+void
+parse(int fd)
+{
+	Biobuf *bp;
+	char *s;
+
+	lsize = 64;
+	lcount = 0;
+	lines = malloc(lsize * sizeof *lines);
+	if(lines==nil)
+		sysfatal("malloc: %r");
+	bp = Bfdopen(fd, OREAD);
+	if(bp==nil)
+		sysfatal("Bfdopen: %r");
+	for(;;){
+		s = Brdstr(bp, '\n', 1);
+		if(s==nil)
+			break;
+		lines[lcount++] = parseline(s);
+		if(lcount>=lsize){
+			lsize *= 2;
+			lines = realloc(lines, lsize*sizeof *lines);
+			if(lines==nil)
+				sysfatal("realloc: %r");
+		}
+	}
+}
+
+void
+main(void)
+{
+	Event ev;
+	int e;
+
+	parse(0);
+	if(initdraw(nil, nil, "vdiff")<0)
+		sysfatal("initdraw: %r");
+	initcols();
+	einit(Emouse|Ekeyboard);
+	eresized(0);
+	for(;;){
+		e = event(&ev);
+		switch(e){
+		case Emouse:
+			if(ev.mouse.buttons&8)
+				scroll(-10);
+			else if(ev.mouse.buttons&16)
+				scroll(10);
+			break;
+		case Ekeyboard:
+			switch(ev.kbdc){
+			case Kdel:
+				goto End;
+				break;
+			case Khome:
+				scroll(-1000000);
+				break;
+			case Kend:
+				scroll(1000000);
+				break;
+			case Kpgup:
+				scroll(-nlines);
+				break;
+			case Kpgdown:
+				scroll(nlines);
+				break;
+			}
+			break;
+		}
+	}
+End:
+	exits(nil);
+}