From 326d316dcb44ca3307244c2a4aa8f2c37c3a43f2 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 30 Jan 2016 10:25:49 +0100
Subject: Initial

---
 .gitignore |   2 +
 volume.cpp | 145 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 147 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 volume.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..917f4b9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.swp
+volume
diff --git a/volume.cpp b/volume.cpp
new file mode 100644
index 0000000..21f625b
--- /dev/null
+++ b/volume.cpp
@@ -0,0 +1,145 @@
+#include <iostream>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <unistd.h>
+#include <termios.h>
+
+using namespace std;
+
+int printusage(int,const char *const *argv,const char *message=NULL){
+	if(message)cout<<message<<endl;
+	cout<<"Usage: "<<argv[0]<<" [volume]"<<endl;
+	cout<<"If [volume] is given, changes volume to that value. (Integer in [0,100].)"<<endl;
+	cout<<"Otherwise, it shows a graphical slider, adjustable with the arrow keys or h/l. If the"<<endl;
+	cout<<"output is not a tty, the graphical slider is disabled."<<endl;
+	return 1;
+}
+
+int setvolume(int vol){
+	char *cmd=NULL;
+	asprintf(&cmd,"osascript -e 'set volume output volume %d'",vol);
+	if(!cmd)return 1;
+	int ret=system(cmd);
+	free(cmd);
+	return ret;
+}
+
+int getvolume(void){
+	FILE *p=popen("osascript -e 'output volume of (get volume settings)'","r");
+	if(!p)return 50;
+	int vol;
+	fscanf(p,"%d",&vol);
+	pclose(p);
+	return vol;
+}
+
+int setmuted(bool m){
+	char *cmd=NULL;
+	asprintf(&cmd,"osascript -e 'set volume output muted %s'",m?"true":"false");
+	if(!cmd)return 1;
+	int ret=system(cmd);
+	free(cmd);
+	return ret;
+}
+
+bool getmuted(void){
+	FILE *p=popen("osascript -e 'output muted of (get volume settings)'","r");
+	if(!p)return false;
+	char s[16];
+	fscanf(p,"%15s",s);
+	pclose(p);
+	if(strcmp(s,"true")==0)return true;
+	else if(strcmp(s,"false")==0)return false;
+	else return false;
+}
+
+void displayslider(bool m,int vol){
+	cout<<"\x1B[2K\r0 |"
+	    <<string(vol/5,'#')<<string((100-vol)/5,'-')
+		<<"| 100 ("<<vol<<"%)";
+	if(m)cout<<"  \x1B[1mMUTED (m)\x1B[0m";
+	cout.flush();
+}
+
+int incvol(int &vol,int inc){
+	if((vol==0&&inc<=0)||(vol==100&&inc>=0))return 0;
+	vol+=inc;
+	if(vol<0)vol=0;
+	if(vol>100)vol=100;
+	return setvolume(vol);
+}
+
+int interact(bool &m,int &vol){
+	char c=cin.get();
+	if(c=='q'||c=='Q'||c=='\n'||c=='\r')return 1;
+	if(c=='l')return incvol(vol,5);
+	if(c=='h')return incvol(vol,-5);
+	if(c=='m'){
+		m=!m;
+		setmuted(m);
+		return 0;
+	}
+	if(c!=27){
+		cout<<7<<flush;
+		return 0;
+	}
+	c=cin.get();
+	if(c!='['){
+		cout<<7<<flush;
+		return 0;
+	}
+	c=cin.get();
+	if(c=='C')return incvol(vol,5);
+	if(c=='D')return incvol(vol,-5);
+	cout<<7<<flush;
+	return 0;
+}
+
+struct termios tios_bak;
+
+void initscreen(void){
+	struct termios tios;
+	tcgetattr(0,&tios_bak);
+	tios=tios_bak;
+	tios.c_lflag&=~(
+		ECHO|ECHOE|ECHOKE //no echo of normal characters, erasing and killing
+		|ECHOCTL //don't visibly echo control characters (^V etc.)
+		|ECHONL //don't even echo a newline
+		|ICANON //disable canonical mode
+#ifdef NOKERNINFO
+		|NOKERNINFO //don't print a status line on ^T
+#endif
+		|IEXTEN //don't handle things like ^V specially
+		//|ISIG //disable ^C ^\ and ^Z
+		);
+	tios.c_cc[VMIN]=1; //read one char at a time
+	tios.c_cc[VTIME]=0; //no timeout on reading, make it a blocking read
+	tcsetattr(0,TCSAFLUSH,&tios);
+}
+
+void endscreen(void){
+	tcsetattr(0,TCSAFLUSH,&tios_bak);
+}
+
+int main(int argc,char **argv){
+	if(argc>2)return printusage(argc,argv);
+	if(argc==2){
+		if(argv[1][0]=='\0')return printusage(argc,argv,"Invalid volume format");
+		char *endp;
+		const int vol=strtol(argv[1],&endp,10);
+		if(*endp!='\0')return printusage(argc,argv,"Invalid volume format");
+		if(vol<0||vol>100)return printusage(argc,argv,"Volume argument not in range");
+		return setvolume(vol);
+	}
+	if(!isatty(1))return printusage(argc,argv,"Won't display slider if stdout is not a terminal");
+	initscreen();
+	atexit(endscreen);
+	bool m=getmuted();
+	int vol=getvolume();
+	while(true){
+		displayslider(m,vol);
+		if(interact(m,vol))break;
+	}
+	cout<<endl;
+}
-- 
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