Added a distro symbol (similar to what you'll find in DEs). Not yet functional.

config.def.h

@@ -3,13 +3,9 @@
 /* appearance */
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
-static const unsigned int gappih    = 10;       /* horiz inner gap between windows */
-static const unsigned int gappiv    = 10;       /* vert inner gap between windows */
-static const unsigned int gappoh    = 10;       /* horiz outer gap between windows and screen edge */
-static const unsigned int gappov    = 10;       /* vert outer gap between windows and screen edge */
-static const int smartgaps          = 0;        /* 1 means no outer gap when there is only one window */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
+static const char *distrosymbol     = "";
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
@@ -75,22 +71,6 @@ static Key keys[] = {
 	{ MODKEY,                       XK_d,      incnmaster,     {.i = -1 } },
 	{ MODKEY,                       XK_h,      setmfact,       {.f = -0.05} },
 	{ MODKEY,                       XK_l,      setmfact,       {.f = +0.05} },
-	{ MODKEY|Mod4Mask,              XK_h,      incrgaps,       {.i = +1 } },
-	{ MODKEY|Mod4Mask,              XK_l,      incrgaps,       {.i = -1 } },
-	{ MODKEY|Mod4Mask|ShiftMask,    XK_h,      incrogaps,      {.i = +1 } },
-	{ MODKEY|Mod4Mask|ShiftMask,    XK_l,      incrogaps,      {.i = -1 } },
-	{ MODKEY|Mod4Mask|ControlMask,  XK_h,      incrigaps,      {.i = +1 } },
-	{ MODKEY|Mod4Mask|ControlMask,  XK_l,      incrigaps,      {.i = -1 } },
-	{ MODKEY|Mod4Mask,              XK_0,      togglegaps,     {0} },
-	{ MODKEY|Mod4Mask|ShiftMask,    XK_0,      defaultgaps,    {0} },
-	{ MODKEY,                       XK_y,      incrihgaps,     {.i = +1 } },
-	{ MODKEY,                       XK_o,      incrihgaps,     {.i = -1 } },
-	{ MODKEY|ControlMask,           XK_y,      incrivgaps,     {.i = +1 } },
-	{ MODKEY|ControlMask,           XK_o,      incrivgaps,     {.i = -1 } },
-	{ MODKEY|Mod4Mask,              XK_y,      incrohgaps,     {.i = +1 } },
-	{ MODKEY|Mod4Mask,              XK_o,      incrohgaps,     {.i = -1 } },
-	{ MODKEY|ShiftMask,             XK_y,      incrovgaps,     {.i = +1 } },
-	{ MODKEY|ShiftMask,             XK_o,      incrovgaps,     {.i = -1 } },
 	{ MODKEY,                       XK_Return, zoom,           {0} },
 	{ MODKEY,                       XK_Tab,    view,           {0} },
 	{ MODKEY|ShiftMask,             XK_c,      killclient,     {0} },

dwm.c

@@ -113,16 +113,13 @@ typedef struct {
 
 struct Monitor {
 	char ltsymbol[16];
+    char distrosymbol[16];
 	float mfact;
 	int nmaster;
 	int num;
 	int by;               /* bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
-	int gappih;           /* horizontal gap between windows */
-	int gappiv;           /* vertical gap between windows */
-	int gappoh;           /* horizontal outer gaps */
-	int gappov;           /* vertical outer gaps */
 	unsigned int seltags;
 	unsigned int sellt;
 	unsigned int tagset[2];
@@ -204,16 +201,6 @@ static void sendmon(Client *c, Monitor *m);
 static void setclientstate(Client *c, long state);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
-static void setgaps(int oh, int ov, int ih, int iv);
-static void incrgaps(const Arg *arg);
-static void incrigaps(const Arg *arg);
-static void incrogaps(const Arg *arg);
-static void incrohgaps(const Arg *arg);
-static void incrovgaps(const Arg *arg);
-static void incrihgaps(const Arg *arg);
-static void incrivgaps(const Arg *arg);
-static void togglegaps(const Arg *arg);
-static void defaultgaps(const Arg *arg);
 static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setup(void);
@@ -255,7 +242,6 @@ static char stext[256];
 static int screen;
 static int sw, sh;           /* X display screen geometry width, height */
 static int bh, blw = 0;      /* bar geometry */
-static int enablegaps = 1;   /* enables gaps, used by togglegaps */
 static int lrpad;            /* sum of left and right padding for text */
 static int (*xerrorxlib)(Display *, XErrorEvent *);
 static unsigned int numlockmask = 0;
@@ -446,7 +432,8 @@ buttonpress(XEvent *e)
 		focus(NULL);
 	}
 	if (ev->window == selmon->barwin) {
-		i = x = 0;
+        x = TEXTW(m->distrosymbol);
+		i = 0;
 		do
 			x += TEXTW(tags[i]);
 		while (ev->x >= x && ++i < LENGTH(tags));
@@ -654,13 +641,10 @@ createmon(void)
 	m->nmaster = nmaster;
 	m->showbar = showbar;
 	m->topbar = topbar;
-	m->gappih = gappih;
-	m->gappiv = gappiv;
-	m->gappoh = gappoh;
-	m->gappov = gappov;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
+    strncpy(m->distrosymbol, distrosymbol, sizeof m->distrosymbol);
 	return m;
 }
 
@@ -734,6 +718,9 @@ drawbar(Monitor *m)
 			urg |= c->tags;
 	}
 	x = 0;
+	w = blw = TEXTW(m->distrosymbol);
+	drw_setscheme(drw, scheme[SchemeNorm]);
+	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->distrosymbol, 0);
 	for (i = 0; i < LENGTH(tags); i++) {
 		w = TEXTW(tags[i]);
 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
@@ -1517,111 +1504,6 @@ setfullscreen(Client *c, int fullscreen)
 	}
 }
 
-void
-setgaps(int oh, int ov, int ih, int iv)
-{
-	if (oh < 0) oh = 0;
-	if (ov < 0) ov = 0;
-	if (ih < 0) ih = 0;
-	if (iv < 0) iv = 0;
-
-	selmon->gappoh = oh;
-	selmon->gappov = ov;
-	selmon->gappih = ih;
-	selmon->gappiv = iv;
-	arrange(selmon);
-}
-
-void
-togglegaps(const Arg *arg)
-{
-	enablegaps = !enablegaps;
-	arrange(selmon);
-}
-
-void
-defaultgaps(const Arg *arg)
-{
-	setgaps(gappoh, gappov, gappih, gappiv);
-}
-
-void
-incrgaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh + arg->i,
-		selmon->gappov + arg->i,
-		selmon->gappih + arg->i,
-		selmon->gappiv + arg->i
-	);
-}
-
-void
-incrigaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh,
-		selmon->gappov,
-		selmon->gappih + arg->i,
-		selmon->gappiv + arg->i
-	);
-}
-
-void
-incrogaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh + arg->i,
-		selmon->gappov + arg->i,
-		selmon->gappih,
-		selmon->gappiv
-	);
-}
-
-void
-incrohgaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh + arg->i,
-		selmon->gappov,
-		selmon->gappih,
-		selmon->gappiv
-	);
-}
-
-void
-incrovgaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh,
-		selmon->gappov + arg->i,
-		selmon->gappih,
-		selmon->gappiv
-	);
-}
-
-void
-incrihgaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh,
-		selmon->gappov,
-		selmon->gappih + arg->i,
-		selmon->gappiv
-	);
-}
-
-void
-incrivgaps(const Arg *arg)
-{
-	setgaps(
-		selmon->gappoh,
-		selmon->gappov,
-		selmon->gappih,
-		selmon->gappiv + arg->i
-	);
-}
-
 void
 setlayout(const Arg *arg)
 {
@@ -1798,32 +1680,28 @@ tagmon(const Arg *arg)
 void
 tile(Monitor *m)
 {
-	unsigned int i, n, h, r, oe = enablegaps, ie = enablegaps, mw, my, ty;
+	unsigned int i, n, h, mw, my, ty;
 	Client *c;
 
 	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
 	if (n == 0)
 		return;
 
-	if (smartgaps == n) {
-		oe = 0; // outer gaps disabled
-	}
-
 	if (n > m->nmaster)
-		mw = m->nmaster ? (m->ww + m->gappiv*ie) * m->mfact : 0;
+		mw = m->nmaster ? m->ww * m->mfact : 0;
 	else
-		mw = m->ww - 2*m->gappov*oe + m->gappiv*ie;
-	for (i = 0, my = ty = m->gappoh*oe, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+		mw = m->ww;
+	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
 		if (i < m->nmaster) {
-			r = MIN(n, m->nmaster) - i;
-			h = (m->wh - my - m->gappoh*oe - m->gappih*ie * (r - 1)) / r;
-			resize(c, m->wx + m->gappov*oe, m->wy + my, mw - (2*c->bw) - m->gappiv*ie, h - (2*c->bw), 0);
-			my += HEIGHT(c) + m->gappih*ie;
+			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
+			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
+			if (my + HEIGHT(c) < m->wh)
+				my += HEIGHT(c);
 		} else {
-			r = n - i;
-			h = (m->wh - ty - m->gappoh*oe - m->gappih*ie * (r - 1)) / r;
-			resize(c, m->wx + mw + m->gappov*oe, m->wy + ty, m->ww - mw - (2*c->bw) - 2*m->gappov*oe, h - (2*c->bw), 0);
-			ty += HEIGHT(c) + m->gappih*ie;
+			h = (m->wh - ty) / (n - i);
+			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
+			if (ty + HEIGHT(c) < m->wh)
+				ty += HEIGHT(c);
 		}
 }