[PATCH v2 8/9] format-support: move `format_sanitized_subject()` from pretty

["Hariom Verma via GitGitGadget" <gitgitgadget@gmail.com>]

From: Hariom Verma <hariom18599@gmail.com>

In hope of some new features in `subject` atom, move funtion
`format_sanitized_subject()` and all the function it uses
to new file format-support.{c,h}.

Consider this new file as a common interface between functions that
pretty.c and ref-filter.c shares.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Heba Waly <heba.waly@gmail.com>
Signed-off-by: Hariom Verma <hariom18599@gmail.com>
---
 Makefile         |  1 +
 format-support.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 format-support.h |  6 ++++++
 pretty.c         | 40 +---------------------------------------
 4 files changed, 51 insertions(+), 39 deletions(-)
 create mode 100644 format-support.c
 create mode 100644 format-support.h

diff --git a/Makefile b/Makefile
index 372139f1f2..4dfc384b49 100644
--- a/Makefile
+++ b/Makefile
@@ -882,6 +882,7 @@ LIB_OBJS += exec-cmd.o
 LIB_OBJS += fetch-negotiator.o
 LIB_OBJS += fetch-pack.o
 LIB_OBJS += fmt-merge-msg.o
+LIB_OBJS += format-support.o
 LIB_OBJS += fsck.o
 LIB_OBJS += fsmonitor.o
 LIB_OBJS += gettext.o
diff --git a/format-support.c b/format-support.c
new file mode 100644
index 0000000000..d693aa1744
--- /dev/null
+++ b/format-support.c
@@ -0,0 +1,43 @@
+#include "diff.h"
+#include "log-tree.h"
+#include "color.h"
+#include "format-support.h"
+
+static int istitlechar(char c)
+{
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
+		(c >= '0' && c <= '9') || c == '.' || c == '_';
+}
+
+void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len)
+{
+	char *r = xmemdupz(msg, len);
+	size_t trimlen;
+	size_t start_len = sb->len;
+	int space = 2;
+	int i;
+
+	for (i = 0; i < len; i++) {
+		if (r[i] == '\n')
+			r[i] = ' ';
+		if (istitlechar(r[i])) {
+			if (space == 1)
+				strbuf_addch(sb, '-');
+			space = 0;
+			strbuf_addch(sb, r[i]);
+			if (r[i] == '.')
+				while (r[i+1] == '.')
+					i++;
+		} else
+			space |= 1;
+	}
+	free(r);
+
+	/* trim any trailing '.' or '-' characters */
+	trimlen = 0;
+	while (sb->len - trimlen > start_len &&
+		(sb->buf[sb->len - 1 - trimlen] == '.'
+		|| sb->buf[sb->len - 1 - trimlen] == '-'))
+		trimlen++;
+	strbuf_remove(sb, sb->len - trimlen, trimlen);
+}
diff --git a/format-support.h b/format-support.h
new file mode 100644
index 0000000000..c344ccbc33
--- /dev/null
+++ b/format-support.h
@@ -0,0 +1,6 @@
+#ifndef FORMAT_SUPPORT_H
+#define FORMAT_SUPPORT_H
+
+void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len);
+
+#endif /* FORMAT_SUPPORT_H */
diff --git a/pretty.c b/pretty.c
index 8d08e8278a..2de01b7115 100644
--- a/pretty.c
+++ b/pretty.c
@@ -12,6 +12,7 @@
 #include "reflog-walk.h"
 #include "gpg-interface.h"
 #include "trailer.h"
+#include "format-support.h"
 
 static char *user_format;
 static struct cmt_fmt_map {
@@ -833,45 +834,6 @@ static void parse_commit_header(struct format_commit_context *context)
 	context->commit_header_parsed = 1;
 }
 
-static int istitlechar(char c)
-{
-	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
-		(c >= '0' && c <= '9') || c == '.' || c == '_';
-}
-
-static void format_sanitized_subject(struct strbuf *sb, const char *msg, size_t len)
-{
-	char *r = xmemdupz(msg, len);
-	size_t trimlen;
-	size_t start_len = sb->len;
-	int space = 2;
-	int i;
-
-	for (i = 0; i < len; i++) {
-		if (r[i] == '\n')
-			r[i] = ' ';
-		if (istitlechar(r[i])) {
-			if (space == 1)
-				strbuf_addch(sb, '-');
-			space = 0;
-			strbuf_addch(sb, r[i]);
-			if (r[i] == '.')
-				while (r[i+1] == '.')
-					i++;
-		} else
-			space |= 1;
-	}
-	free(r);
-
-	/* trim any trailing '.' or '-' characters */
-	trimlen = 0;
-	while (sb->len - trimlen > start_len &&
-		(sb->buf[sb->len - 1 - trimlen] == '.'
-		|| sb->buf[sb->len - 1 - trimlen] == '-'))
-		trimlen++;
-	strbuf_remove(sb, sb->len - trimlen, trimlen);
-}
-
 const char *format_subject(struct strbuf *sb, const char *msg,
 			   const char *line_separator)
 {
-- 
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