slbt_output_exec: color+annotate output

This patch adds functionality to slbt_output_exec that colors/annotates output
if outputting to a terminal, or annotation is explicitly enabled.

Currently annotated output includes emboldening "slibtool:" and giving it a
magenta, emboldening and coloring the step (compile, link, install) green, and
then annotating the "-o <output>" argument.

1 files changed, 69 insertions, 1 deletions

diff --git a/src/output/slbt_output_exec.c b/src/output/slbt_output_exec.c
index ff14064..7886e0a 100644
--- a/src/output/slbt_output_exec.c
+++ b/src/output/slbt_output_exec.c
@@ -4,14 +4,64 @@
 /*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
 /*******************************************************************/
 
+#include <unistd.h>
 #include <stdio.h>
 #include <slibtool/slibtool.h>
 
-int slbt_output_exec(
+const char aclr_null[]    = "";
+const char aclr_reset[]   = "\e[0m";
+const char aclr_bold[]    = "\e[1m";
+
+const char aclr_green[]   = "\e[32m";
+const char aclr_blue[]    = "\e[34m";
+const char aclr_magenta[] = "\e[35m";
+
+static int slbt_output_exec_annotated(
 	const struct slbt_driver_ctx *	dctx,
 	const struct slbt_exec_ctx *	ectx,
 	const char *			step)
 {
+	char **      parg;
+	const char * aclr_set;
+	const char * aclr_color;
+	const char * aclr_unset;
+
+	if (fprintf(stdout,"%s%s%s: %s%s%s%s:%s",
+			aclr_bold,aclr_magenta,
+			dctx->program,aclr_reset,
+			aclr_bold,aclr_green,step,aclr_reset) < 0)
+		return -1;
+
+	for (parg=ectx->argv; *parg; parg++) {
+		if (parg == ectx->lout[0]) {
+			aclr_set      = aclr_bold;
+			aclr_color    = aclr_blue;
+			aclr_unset    = aclr_null;
+		} else {
+			aclr_set      = aclr_null;
+			aclr_color    = aclr_null;
+			aclr_unset    = aclr_reset;
+		}
+
+		if (fprintf(stdout," %s%s%s%s",
+				aclr_set,aclr_color,
+				*parg,
+				aclr_unset) < 0)
+			return -1;
+
+	}
+
+	if (fputc('\n',stdout) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int slbt_output_exec_plain(
+	const struct slbt_driver_ctx *	dctx,
+	const struct slbt_exec_ctx *	ectx,
+	const char *		step)
+{
 	char ** parg;
 
 	if (fprintf(stdout,"%s: %s:",dctx->program,step) < 0)
@@ -27,6 +77,24 @@ int slbt_output_exec(
 	return 0;
 }
 
+int slbt_output_exec(
+	const struct slbt_driver_ctx *	dctx,
+	const struct slbt_exec_ctx *	ectx,
+	const char *			step)
+{
+	if (dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_NEVER)
+		return slbt_output_exec_plain(dctx,ectx,step);
+
+	else if (dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_ALWAYS)
+		return slbt_output_exec_annotated(dctx,ectx,step);
+
+	else if (isatty(STDOUT_FILENO))
+		return slbt_output_exec_annotated(dctx,ectx,step);
+
+	else
+		return slbt_output_exec_plain(dctx,ectx,step);
+}
+
 int slbt_output_compile(
 	const struct slbt_driver_ctx *	dctx,
 	const struct slbt_exec_ctx *	ectx)