1 files changed, 168 insertions, 0 deletions
diff --git a/src/cmd/scat/prose.c b/src/cmd/scat/prose.c
new file mode 100644
index 00000000..17a09750
--- /dev/null
+++ b/src/cmd/scat/prose.c
@@ -0,0 +1,168 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "sky.h"
+
+extern	Biobuf	bout;
+
+char*
+append(char *p, char *s)
+{
+	while(*s)
+		*p++ = *s++;
+	return p;
+}
+
+int
+matchlen(char *a, char *b)
+{
+	int n;
+
+	for(n=0; *a==*b; a++, b++, n++)
+		if(*a == 0)
+			return n;
+	if(*a == 0)
+		return n;
+	return 0;
+}
+
+char*
+prose(char *s, char *desc[][2], short index[])
+{
+	static char buf[512];
+	char *p=buf;
+	int i, j, k, max;
+
+	j = 0;
+	while(*s){
+		if(p >= buf+sizeof buf)
+			abort();
+		if(*s == ' '){
+			if(p>buf && p[-1]!=' ')
+				*p++ = ' ';
+			s++;
+			continue;
+		}
+		if(*s == ','){
+			*p++ = ';', s++;
+			continue;
+		}
+		if(s[0]=='M' && '0'<=s[1] && s[1]<='9'){	/* Messier tag */
+			*p++ = *s++;
+			continue;	/* below will copy the number */
+		}
+		if((i=index[(uchar)*s]) == -1){
+	Dup:
+			switch(*s){
+			default:
+				while(*s && *s!=',' && *s!=' ')
+					*p++=*s++;
+				break;
+
+			case '0': case '1': case '2': case '3': case '4':
+			case '5': case '6': case '7': case '8': case '9':
+				while('0'<=*s && *s<='9')
+					*p++ = *s++;
+				if(*s=='\'' || *s=='s')
+					*p++ = *s++;
+				break;
+
+			case '(': case ')':
+			case '\'': case '"':
+			case '&': case '-': case '+':
+				*p++ = *s++;
+				break;
+
+			case '*':
+				if('0'<=s[1] && s[1]<='9'){
+					int flag=0;
+					s++;
+				Pnumber:
+					while('0'<=*s && *s<='9')
+						*p++=*s++;
+					if(s[0] == '-'){
+						*p++ = *s++;
+						flag++;
+						goto Pnumber;
+					}
+					if(s[0]==',' && s[1]==' ' && '0'<=s[2] && s[2]<='9'){
+						*p++ = *s++;
+						s++;	/* skip blank */
+						flag++;
+						goto Pnumber;
+					}
+					if(s[0] == '.'){
+						if(s[1]=='.' && s[2]=='.'){
+							*p++ = '-';
+							s += 3;
+							flag++;
+							goto Pnumber;
+						}
+						*p++ = *s++;
+						goto Pnumber;
+					}
+					p = append(p, "m star");
+					if(flag)
+						*p++ = 's';
+					*p++ = ' ';
+					break;
+				}
+				if(s[1] == '*'){
+					if(s[2] == '*'){
+						p = append(p, "triple star ");
+						s += 3;
+					}else{
+						p = append(p, "double star ");
+						s += 2;
+					}
+					break;
+				}
+				p = append(p, "star ");
+				s++;
+				break;
+			}
+			continue;
+		}
+		for(max=-1; desc[i][0] && desc[i][0][0]==*s; i++){
+			k = matchlen(desc[i][0], s);
+			if(k > max)
+				max = k, j = i;
+		}
+		if(max == 0)
+			goto Dup;
+		s += max;
+		for(k=0; desc[j][1][k]; k++)
+			*p++=desc[j][1][k];
+		if(*s == ' ')
+			*p++ = *s++;
+		else if(*s == ',')
+			*p++ = ';', s++;
+		else
+			*p++ = ' ';
+	}
+	*p = 0;
+	return buf;
+}
+
+void
+prdesc(char *s, char *desc[][2], short index[])
+{
+	int c, j;
+
+	if(index[0] == 0){
+		index[0] = 1;
+		for(c=1, j=0; c<128; c++)
+			if(desc[j][0]==0 || desc[j][0][0]>c)
+				index[c] = -1;
+			else if(desc[j][0][0] == c){
+				index[c] = j;
+				while(desc[j][0] && desc[j][0][0] == c)
+					j++;
+				if(j >= NINDEX){
+					fprint(2, "scat: internal error: too many prose entries\n");
+					exits("NINDEX");
+				}
+			}
+	}
+	Bprint(&bout, "\t%s [%s]\n", prose(s, desc, index), s);
+}