dev: automatic version.h generation

also added compiler information as a feature

.gitignore

@@ -8,3 +8,5 @@ valgrind-out.txt
 
 # nix build result
 result
+
+include/version.h

Makefile

@@ -1,3 +1,6 @@
+VERSION = 1.1.1
+.DEFAULT_GOAL := lidm
+
 CDIR=src
 LDIR=lib
 IDIR=include
@@ -8,7 +11,7 @@ PREFIX=/usr
 CC?=gcc
 CFLAGS?=-O3 -Wall
 _CFLAGS=-I$(DIR)
-BUILD_FLAGS=-DLIDM_GIT_DESCRIPTION="\"$(shell git describe --long --tags --always || echo ?)\"" -DLIDM_BUILD_DATE="\"$(shell date -u +"%Y-%m-%dT%H:%M:%SZ" || echo ?)\""
+BUILD_FLAGS=
 ALLFLAGS=$(CFLAGS) -I$(IDIR) $(BUILD_FLAGS)
 
 LIBS=-lpam
@@ -19,6 +22,17 @@ DEPS = $(patsubst %,$(IDIR)/%,$(_DEPS))
 _OBJ = main.o log.o util.o ui.o ui_state.o config.o desktop.o auth.o ofield.o efield.o users.o sessions.o chvt.o launch_state.o
 OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))
 
+$(IDIR)/version.h: Makefile .git/HEAD
+	@tmp=$$(mktemp); \
+	printf '' > $$tmp; \
+	echo '#define LIDM_VERSION "'$(VERSION)'"' >> $$tmp; \
+	echo '#define LIDM_GIT_REV "'$$(git describe --long --tags --always)'"' >> $$tmp; \
+	echo '#define LIDM_BUILD_TS '$$(date +%s) >> $$tmp; \
+	if ! cmp -s $$tmp $@; then \
+		mv $$tmp $@; \
+	fi; \
+	rm -f $$tmp;
+
 $(ODIR)/%.o: $(CDIR)/%.c $(DEPS)
 	@mkdir -p $(ODIR)
 	$(CC) -c -o $@ $< $(ALLFLAGS)
@@ -26,7 +40,6 @@ $(ODIR)/%.o: $(CDIR)/%.c $(DEPS)
 lidm: $(OBJ)
 	$(CC) -o $@ $^ $(ALLFLAGS) $(LIBS)
 
-.PHONY: clean
 clean:
 	rm -f $(ODIR)/*.o lidm
 
@@ -79,3 +92,13 @@ pre-commit:
 	find . -type f -name '*.sh' -not -path './assets/pkg/aur/*/src/*' | xargs shellcheck
 	clang-format -i $$(git ls-files "*.c" "*.h")
 	clang-tidy -p . $$(git ls-files "*.c" "*.h")
+
+.PHONY: clean \
+	install uninstall \
+	install-service \
+	install-service-s6 \
+	install-service-dinit \
+	install-service-runit \
+	install-service-openrc \
+	install-service-systemd \
+	pre-commit

include/macros.h

@@ -20,6 +20,16 @@
 #define UNULLABLE
 #endif
 
+#if defined(__clang__)
+#define COMPILER_VERSION __VERSION__
+#elif defined(__GNUC__)
+#define xstr(s) str(s)
+#define str(s) #s
+
+#define COMPILER_VERSION \
+"GCC " xstr(__GNUC__) "." xstr(__GNUC_MINOR__) "." xstr(__GNUC_PATCHLEVEL__)
+#endif
+
 #define LEN(X) (sizeof(X) / sizeof((X)[0]))
 
 #endif

include/version.h

@@ -1,9 +0,0 @@
-#ifndef LIDM_VERSION
-#define LIDM_VERSION "v1.1.1"
-#endif
-#ifndef LIDM_GIT_DESCRIPTION
-#define LIDM_GIT_DESCRIPTION "?"
-#endif
-#ifndef LIDM_BUILD_DATE
-#define LIDM_BUILD_DATE "?"
-#endif

src/main.c

@@ -4,17 +4,20 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
+#include <time.h>
 #include <unistd.h>
 
 #include "chvt.h"
 #include "config.h"
 #include "log.h"
+#include "macros.h"
 #include "sessions.h"
 #include "ui.h"
 #include "users.h"
 #include "util.h"
 #include "version.h"
 
+#define DATESTR_MAXBUFSIZE 0x20
 int main(int argc, char* argv[]) {
   // Logger
   char* log_output = getenv("LIDM_LOG");
@@ -31,20 +34,40 @@ int main(int argc, char* argv[]) {
 
   if (argc == 2) {
     if (strcmp(argv[1], "-v") == 0 || strcmp(argv[1], "--version") == 0) {
-      printf("lidm version %s (git %s, build date %s)\n", LIDM_VERSION,
-             LIDM_GIT_DESCRIPTION, LIDM_BUILD_DATE);
+      char* version = "?";
+      char* revision = "?";
+      char* builddate = "?";
+      char* compilever = "?";
+#ifdef LIDM_VERSION
+      version = LIDM_VERSION;
+#endif
+#ifdef LIDM_GIT_REV
+      revision = LIDM_GIT_REV;
+#endif
+#ifdef LIDM_BUILD_TS
+      time_t ts = LIDM_BUILD_TS;
+      char date_buf[DATESTR_MAXBUFSIZE];
+      builddate = date_buf;
+      if (strftime(date_buf, 0xff, "%Y-%m-%dT%H:%M:%SZ", localtime(&ts)) > 0)
+        builddate = date_buf;
+#endif
+#ifdef COMPILER_VERSION
+      compilever = COMPILER_VERSION;
+#endif
+      printf("lidm version %s (git %s, build date %s, compiler %s)\n", version,
+             revision, builddate, compilever);
       return 0;
-    } else if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
+    }
+    if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
       printf(
           "Usage: lidm [vt number]\n"
           "Options:\n"
           "  -h, --help     Display help menu\n"
           "  -v, --version  Display version information\n");
       return 0;
-    } else {
-      // Chvt
-      chvt_str(argv[1]);
     }
+    // Chvt
+    chvt_str(argv[1]);
   }
 
   struct config config = DEFAULT_CONFIG;