Add read-only option

Add command line option to disable all system and process changing
features.

1 files changed, 60 insertions, 38 deletions

diff --git a/Action.c b/Action.c
index c894c92f..5cffe760 100644
--- a/Action.c
+++ b/Action.c
@@ -254,11 +254,17 @@ static Htop_Reaction actionIncSearch(State* st) {
 }
 
 static Htop_Reaction actionHigherPriority(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    bool changed = changePriority(st->mainPanel, -1);
    return changed ? HTOP_REFRESH : HTOP_OK;
 }
 
 static Htop_Reaction actionLowerPriority(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    bool changed = changePriority(st->mainPanel, 1);
    return changed ? HTOP_REFRESH : HTOP_OK;
 }
@@ -292,6 +298,9 @@ static Htop_Reaction actionQuit(ATTR_UNUSED State* st) {
 }
 
 static Htop_Reaction actionSetAffinity(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    if (st->pl->cpuCount == 1)
       return HTOP_OK;
 
@@ -323,6 +332,9 @@ static Htop_Reaction actionSetAffinity(State* st) {
 }
 
 static Htop_Reaction actionKill(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    Panel* signalsPanel = SignalsPanel_new();
    const ListItem* sgn = (ListItem*) Action_pickFromVector(st, signalsPanel, 15, true);
    if (sgn && sgn->key != 0) {
@@ -370,6 +382,9 @@ static Htop_Reaction actionSetup(State* st) {
 }
 
 static Htop_Reaction actionLsof(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    const Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
    if (!p)
       return HTOP_OK;
@@ -394,6 +409,9 @@ static Htop_Reaction actionShowLocks(State* st) {
 }
 
 static Htop_Reaction actionStrace(State* st) {
+   if (Settings_isReadonly())
+      return HTOP_OK;
+
    const Process* p = (Process*) Panel_getSelected((Panel*)st->mainPanel);
    if (!p)
       return HTOP_OK;
@@ -431,49 +449,51 @@ static Htop_Reaction actionTogglePauseProcessUpdate(State* st) {
 
 static const struct {
    const char* key;
+   bool roInactive;
    const char* info;
 } helpLeft[] = {
-   { .key = " Arrows: ", .info = "scroll process list" },
-   { .key = " Digits: ", .info = "incremental PID search" },
-   { .key = "   F3 /: ", .info = "incremental name search" },
-   { .key = "   F4 \\: ",.info = "incremental name filtering" },
-   { .key = "   F5 t: ", .info = "tree view" },
-   { .key = "      p: ", .info = "toggle program path" },
-   { .key = "      m: ", .info = "toggle merged command" },
-   { .key = "      Z: ", .info = "pause/resume process updates" },
-   { .key = "      u: ", .info = "show processes of a single user" },
-   { .key = "      H: ", .info = "hide/show user process threads" },
-   { .key = "      K: ", .info = "hide/show kernel threads" },
-   { .key = "      F: ", .info = "cursor follows process" },
-   { .key = "  + - *: ", .info = "expand/collapse tree/toggle all" },
-   { .key = "N P M T: ", .info = "sort by PID, CPU%, MEM% or TIME" },
-   { .key = "      I: ", .info = "invert sort order" },
-   { .key = " F6 > .: ", .info = "select sort column" },
+   { .key = " Arrows: ",  .roInactive = false, .info = "scroll process list" },
+   { .key = " Digits: ",  .roInactive = false, .info = "incremental PID search" },
+   { .key = "   F3 /: ",  .roInactive = false, .info = "incremental name search" },
+   { .key = "   F4 \\: ", .roInactive = false, .info = "incremental name filtering" },
+   { .key = "   F5 t: ",  .roInactive = false, .info = "tree view" },
+   { .key = "      p: ",  .roInactive = false, .info = "toggle program path" },
+   { .key = "      m: ",  .roInactive = false, .info = "toggle merged command" },
+   { .key = "      Z: ",  .roInactive = false, .info = "pause/resume process updates" },
+   { .key = "      u: ",  .roInactive = false, .info = "show processes of a single user" },
+   { .key = "      H: ",  .roInactive = false, .info = "hide/show user process threads" },
+   { .key = "      K: ",  .roInactive = false, .info = "hide/show kernel threads" },
+   { .key = "      F: ",  .roInactive = false, .info = "cursor follows process" },
+   { .key = "  + - *: ",  .roInactive = false, .info = "expand/collapse tree/toggle all" },
+   { .key = "N P M T: ",  .roInactive = false, .info = "sort by PID, CPU%, MEM% or TIME" },
+   { .key = "      I: ",  .roInactive = false, .info = "invert sort order" },
+   { .key = " F6 > .: ",  .roInactive = false, .info = "select sort column" },
    { .key = NULL, .info = NULL }
 };
 
 static const struct {
    const char* key;
+   bool roInactive;
    const char* info;
 } helpRight[] = {
-   { .key = "  Space: ", .info = "tag process" },
-   { .key = "      c: ", .info = "tag process and its children" },
-   { .key = "      U: ", .info = "untag all processes" },
-   { .key = "   F9 k: ", .info = "kill process/tagged processes" },
-   { .key = "   F7 ]: ", .info = "higher priority (root only)" },
-   { .key = "   F8 [: ", .info = "lower priority (+ nice)" },
+   { .key = "  Space: ", .roInactive = false, .info = "tag process" },
+   { .key = "      c: ", .roInactive = false, .info = "tag process and its children" },
+   { .key = "      U: ", .roInactive = false, .info = "untag all processes" },
+   { .key = "   F9 k: ", .roInactive = true,  .info = "kill process/tagged processes" },
+   { .key = "   F7 ]: ", .roInactive = true,  .info = "higher priority (root only)" },
+   { .key = "   F8 [: ", .roInactive = false, .info = "lower priority (+ nice)" },
 #if (defined(HAVE_LIBHWLOC) || defined(HAVE_LINUX_AFFINITY))
-   { .key = "      a: ", .info = "set CPU affinity" },
+   { .key = "      a: ", .roInactive = true, .info = "set CPU affinity" },
 #endif
-   { .key = "      e: ", .info = "show process environment" },
-   { .key = "      i: ", .info = "set IO priority" },
-   { .key = "      l: ", .info = "list open files with lsof" },
-   { .key = "      x: ", .info = "list file locks of process" },
-   { .key = "      s: ", .info = "trace syscalls with strace" },
-   { .key = "      w: ", .info = "wrap process command in multiple lines" },
-   { .key = " F2 C S: ", .info = "setup" },
-   { .key = "   F1 h: ", .info = "show this help screen" },
-   { .key = "  F10 q: ", .info = "quit" },
+   { .key = "      e: ", .roInactive = false, .info = "show process environment" },
+   { .key = "      i: ", .roInactive = true,  .info = "set IO priority" },
+   { .key = "      l: ", .roInactive = true,  .info = "list open files with lsof" },
+   { .key = "      x: ", .roInactive = false, .info = "list file locks of process" },
+   { .key = "      s: ", .roInactive = true,  .info = "trace syscalls with strace" },
+   { .key = "      w: ", .roInactive = false, .info = "wrap process command in multiple lines" },
+   { .key = " F2 C S: ", .roInactive = false, .info = "setup" },
+   { .key = "   F1 h: ", .roInactive = false, .info = "show this help screen" },
+   { .key = "  F10 q: ", .roInactive = false, .info = "quit" },
    { .key = NULL, .info = NULL }
 };
 
@@ -549,26 +569,28 @@ static Htop_Reaction actionHelp(State* st) {
 
    line++;
 
+   const bool readonly = Settings_isReadonly();
+
    int item;
    for (item = 0; helpLeft[item].key; item++) {
-      attrset(CRT_colors[DEFAULT_COLOR]);
+      attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[DEFAULT_COLOR]);
       mvaddstr(line + item, 10, helpLeft[item].info);
-      attrset(CRT_colors[HELP_BOLD]);
+      attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[HELP_BOLD]);
       mvaddstr(line + item, 1,  helpLeft[item].key);
       if (String_eq(helpLeft[item].key, "      H: ")) {
-         attrset(CRT_colors[PROCESS_THREAD]);
+         attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[PROCESS_THREAD]);
          mvaddstr(line + item, 33, "threads");
       } else if (String_eq(helpLeft[item].key, "      K: ")) {
-         attrset(CRT_colors[PROCESS_THREAD]);
+         attrset((helpLeft[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[PROCESS_THREAD]);
          mvaddstr(line + item, 27, "threads");
       }
    }
    int leftHelpItems = item;
 
    for (item = 0; helpRight[item].key; item++) {
-      attrset(CRT_colors[HELP_BOLD]);
+      attrset((helpRight[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[HELP_BOLD]);
       mvaddstr(line + item, 41, helpRight[item].key);
-      attrset(CRT_colors[DEFAULT_COLOR]);
+      attrset((helpRight[item].roInactive && readonly) ? CRT_colors[HELP_SHADOW] : CRT_colors[DEFAULT_COLOR]);
       mvaddstr(line + item, 50, helpRight[item].info);
    }
    line += MAXIMUM(leftHelpItems, item);